samples/Titanic.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "%use dataframe, khttp"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "// to see autogenerated code, uncomment the line below:\n",
    "//%trackExecution -generated"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Get Data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "val response = khttp.get(\"http://biostat.mc.vanderbilt.edu/wiki/pub/Main/DataSets/titanic.txt\")\n",
    "val cleanedText = response.text.replace(\"\\\"Molly\\\"\", \"Molly\").replace(\"row.names\", \"row\").replace(\"home.dest\", \"home\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "// convert data to dataframe, generate marker interface for typed data frame wrapper and extension properties for it\n",
    "val df = DataFrame.readDelim(cleanedText.byteInputStream())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"14\">14</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"15\">15</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Select"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "name [Str][1313]: Allen, Miss Elisabeth Walton, Allison, Miss Helen Loraine, Allison, Mr Hudson Josh..."
      ]
     },
     "execution_count": 6,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// get typed column as extension property\n",
    "df.name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// select single column -> returns DataFrame\n",
    "df.select{name}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 8,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// select several columns\n",
    "df.select{columns(name, age, embarked)}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 9,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// another way to select columns without compile-time check\n",
    "df.select(df.name, df.age, df.sex)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 10,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// select columns filtered by predicate\n",
    "df.selectIf{valueClass == String::class}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Index"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr></table></body></html>"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Row indexing\n",
    "df[1]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Allen, Miss Elisabeth Walton"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Column indexing\n",
    "df.name[0]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Allen, Miss Elisabeth Walton"
      ]
     },
     "execution_count": 13,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Same result\n",
    "df[0].name"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Filter"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"24\">24</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mrs Dickinson H. (Helen Walton)\">Bishop, Mrs Dickinson H. (Helen Walton)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"28\">28</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bonnell, Miss Caroline\">Bonnell, Miss Caroline</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Youngstown, OH\">Youngstown, OH</td><td style=\"text-align:left\" title=\"C-7\">C-7</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"29\">29</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bonnell, Miss Elizabeth\">Bonnell, Miss Elizabeth</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Birkdale, England Cleveland, Ohio\">Birkdale, England Cleveland, Ohio</td><td style=\"text-align:left\" title=\"C-103\">C-103</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"31\">31</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bowen, Miss Grace Scott\">Bowen, Miss Grace Scott</td><td style=\"text-align:left\" title=\"45.0\">45.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Cooperstown, NY\">Cooperstown, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"32\">32</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bowerman, Miss Elsie Edith\">Bowerman, Miss Elsie Edith</td><td style=\"text-align:left\" title=\"22.0\">22.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Leonards-on-Sea, England Ohio\">St Leonards-on-Sea, England Ohio</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"37\">37</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Brown, Mrs James Joseph (Margaret Molly Tobin)\">Brown, Mrs James Joseph (Margaret Molly Tobin)</td><td style=\"text-align:left\" title=\"44.0\">44.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Denver, CO\">Denver, CO</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17610 L27 15s 5d\">17610 L27 15s 5d</td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"38\">38</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Brown, Mrs John Murray (Caroline Lane Lamson)\">Brown, Mrs John Murray (Caroline Lane Lamson)</td><td style=\"text-align:left\" title=\"59.0\">59.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belmont, MA\">Belmont, MA</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"D\">D</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"39\">39</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bucknell, Mrs William Robert (Emma Eliza Ward)\">Bucknell, Mrs William Robert (Emma Eliza Ward)</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Philadelphia, PA\">Philadelphia, PA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"42\">42</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Candee, Mrs Edward (Helen Churchill Hungerford)\">Candee, Mrs Edward (Helen Churchill Hungerford)</td><td style=\"text-align:left\" title=\"53.0\">53.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Washington, DC\">Washington, DC</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"43\">43</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Cardeza, Mrs James Warburton Martinez (Charlotte Wardle Drake)\">Cardeza, Mrs James Warburton Martinez (Charlott...</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Germantown, Philadelphia, PA\">Germantown, Philadelphia, PA</td><td style=\"text-align:left\" title=\"B-51/3/5\">B-51/3/5</td><td style=\"text-align:left\" title=\"17755 L512 6s\">17755 L512 6s</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"49\">49</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Carter, Mrs William Ernest (Lucile Polk)\">Carter, Mrs William Ernest (Lucile Polk)</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bryn Mawr, PA\">Bryn Mawr, PA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// filter rows by predicate. Predicate receiver is of type TypedDataFrameRow<*> with generated extension properties\n",
    "df.filter {sex == \"female\"}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Operator call corresponds to a dot-qualified call 'age.compareTo(50)' which is not allowed on a nullable receiver 'age'."
     ]
    }
   ],
   "source": [
    "df.filter { age > 50 } // compilation error, because 'age' is a nullable property"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 16,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// filter rows where 'age' is not null. \n",
    "val withAges = df.filterNotNull {age}\n",
    "withAges"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"29\">29</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bonnell, Miss Elizabeth\">Bonnell, Miss Elizabeth</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Birkdale, England Cleveland, Ohio\">Birkdale, England Cleveland, Ohio</td><td style=\"text-align:left\" title=\"C-103\">C-103</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"38\">38</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Brown, Mrs John Murray (Caroline Lane Lamson)\">Brown, Mrs John Murray (Caroline Lane Lamson)</td><td style=\"text-align:left\" title=\"59.0\">59.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belmont, MA\">Belmont, MA</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"D\">D</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"39\">39</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bucknell, Mrs William Robert (Emma Eliza Ward)\">Bucknell, Mrs William Robert (Emma Eliza Ward)</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Philadelphia, PA\">Philadelphia, PA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"42\">42</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Candee, Mrs Edward (Helen Churchill Hungerford)\">Candee, Mrs Edward (Helen Churchill Hungerford)</td><td style=\"text-align:left\" title=\"53.0\">53.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Washington, DC\">Washington, DC</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"43\">43</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Cardeza, Mrs James Warburton Martinez (Charlotte Wardle Drake)\">Cardeza, Mrs James Warburton Martinez (Charlott...</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Germantown, Philadelphia, PA\">Germantown, Philadelphia, PA</td><td style=\"text-align:left\" title=\"B-51/3/5\">B-51/3/5</td><td style=\"text-align:left\" title=\"17755 L512 6s\">17755 L512 6s</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"68\">68</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Compton, Mrs Alexander Taylor (Mary Eliza Ingersoll)\">Compton, Mrs Alexander Taylor (Mary Eliza Inger...</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Lakewood, NJ\">Lakewood, NJ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"14\">14</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"71\">71</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Cornell, Mrs Robert Clifford (Malvina Helen Lamson)\">Cornell, Mrs Robert Clifford (Malvina Helen Lam...</td><td style=\"text-align:left\" title=\"55.0\">55.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"73\">73</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Crosby, Captain Edward Gifford\">Crosby, Captain Edward Gifford</td><td style=\"text-align:left\" title=\"70.0\">70.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(269)\">(269)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"74\">74</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead)\">Crosby, Mrs Edward Gifford (Catherine Elizabeth...</td><td style=\"text-align:left\" title=\"69.0\">69.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"95\">95</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Eustis, Miss Elizabeth Mussey\">Eustis, Miss Elizabeth Mussey</td><td style=\"text-align:left\" title=\"53.0\">53.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Brookline, MA\">Brookline, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"104\">104</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Fortune, Mr Mark\">Fortune, Mr Mark</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Winnipeg, MB\">Winnipeg, MB</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"105\">105</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Fortune, Mrs Mark (Mary McDougald)\">Fortune, Mrs Mark (Mary McDougald)</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Winnipeg, MB\">Winnipeg, MB</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"111\">111</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Frolicher-Stehli, Mr Maxmillian\">Frolicher-Stehli, Mr Maxmillian</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Zurich, Switzerland\">Zurich, Switzerland</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"120\">120</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Goldschmidt, Mr George B.\">Goldschmidt, Mr George B.</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"121\">121</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Gracie, Colonel Archibald IV\">Gracie, Colonel Archibald IV</td><td style=\"text-align:left\" title=\"54.0\">54.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Washington, DC\">Washington, DC</td><td style=\"text-align:left\" title=\"C-51\">C-51</td><td style=\"text-align:left\" title=\"113780 L28 10s\">113780 L28 10s</td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"124\">124</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Graham, Mrs William Thompson (Edith Junkins)\">Graham, Mrs William Thompson (Edith Junkins)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Greenwich, CT\">Greenwich, CT</td><td style=\"text-align:left\" title=\"C-91\">C-91</td><td style=\"text-align:left\" title=\"17582 L153 9s 3d\">17582 L153 9s 3d</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"135\">135</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Hays, Mr Charles Melville\">Hays, Mr Charles Melville</td><td style=\"text-align:left\" title=\"55.0\">55.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(307)\">(307)</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 17,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// now filtration works\n",
    "withAges.filter {age > 50}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"74\">74</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead)\">Crosby, Mrs Edward Gifford (Catherine Elizabeth...</td><td style=\"text-align:left\" title=\"69.0\">69.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table></body></html>"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// find the oldest survived woman\n",
    "withAges.filter {survived == 1 && sex == \"female\"}.maxBy{age}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Sort"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"506\">506</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Mitchell, Mr Henry Michael\">Mitchell, Mr Henry Michael</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Guernsey / Montclair, NJ and/or Toledo, Ohio\">Guernsey / Montclair, NJ and/or Toledo, Ohio</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"120\">120</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Goldschmidt, Mr George B.\">Goldschmidt, Mr George B.</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"73\">73</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Crosby, Captain Edward Gifford\">Crosby, Captain Edward Gifford</td><td style=\"text-align:left\" title=\"70.0\">70.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(269)\">(269)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"74\">74</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead)\">Crosby, Mrs Edward Gifford (Catherine Elizabeth...</td><td style=\"text-align:left\" title=\"69.0\">69.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"253\">253</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Straus, Mr Isidor\">Straus, Mr Isidor</td><td style=\"text-align:left\" title=\"67.0\">67.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17483 L221 15s 7d\">17483 L221 15s 7d</td><td style=\"text-align:left\" title=\"(96)\">(96)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"773\">773</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Dewan, Mr Frank\">Dewan, Mr Frank</td><td style=\"text-align:left\" title=\"65.0\">65.0</td><td style=\"text-align:left\" title=\"Queenstown\">Queenstown</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"180\">180</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Millet, Mr Francis Davis\">Millet, Mr Francis Davis</td><td style=\"text-align:left\" title=\"65.0\">65.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"East Bridgewater, MA\">East Bridgewater, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(249)\">(249)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"510\">510</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Myles, Mr Thomas Francis\">Myles, Mr Thomas Francis</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Queenstown\">Queenstown</td><td style=\"text-align:left\" title=\"Cambridge, MA\">Cambridge, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"271\">271</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Warren, Mr Frank Manley\">Warren, Mr Frank Manley</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Portland, OR\">Portland, OR</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"194\">194</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Ostby, Mr Engelhart Cornelius\">Ostby, Mr Engelhart Cornelius</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Providence, RI\">Providence, RI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(234)\">(234)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"192\">192</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Nicholson, Mr Arthur Ernest\">Nicholson, Mr Arthur Ernest</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Isle of Wight, England\">Isle of Wight, England</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(263)\">(263)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"104\">104</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Fortune, Mr Mark\">Fortune, Mr Mark</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Winnipeg, MB\">Winnipeg, MB</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"68\">68</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Compton, Mrs Alexander Taylor (Mary Eliza Ingersoll)\">Compton, Mrs Alexander Taylor (Mary Eliza Inger...</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Lakewood, NJ\">Lakewood, NJ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"14\">14</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"254\">254</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Straus, Mrs Isidor (Ida Blun)\">Straus, Mrs Isidor (Ida Blun)</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17483 L221 15s 7d\">17483 L221 15s 7d</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"252\">252</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Stone, Mrs George Nelson (Martha E.)\">Stone, Mrs George Nelson (Martha E.)</td><td style=\"text-align:left\" title=\"62.0\">62.0</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"Cincinatti, OH\">Cincinatti, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"247\">247</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Stead, Mr William Thomas\">Stead, Mr William Thomas</td><td style=\"text-align:left\" title=\"62.0\">62.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Wimbledon Park, London / Hayling Island, Hants\">Wimbledon Park, London / Hayling Island, Hants</td><td style=\"text-align:left\" title=\"C-89\">C-89</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"269\">269</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Van Derhoef, Mr Wyckoff\">Van Derhoef, Mr Wyckoff</td><td style=\"text-align:left\" title=\"61.0\">61.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Brooklyn, NY\">Brooklyn, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(245)\">(245)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"255\">255</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Sutton, Mr Frederick\">Sutton, Mr Frederick</td><td style=\"text-align:left\" title=\"61.0\">61.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Haddenfield, NJ\">Haddenfield, NJ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(46)\">(46)</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// sort by single column\n",
    "withAges.sortedByDesc {age}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"764\">764</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Dean, Miss Elizabeth Gladys (Millvena)\">Dean, Miss Elizabeth Gladys (Millvena)</td><td style=\"text-align:left\" title=\"0.1667\">0.1667</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Devon, England Wichita, KS\">Devon, England Wichita, KS</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"752\">752</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Danbom, Master Gilbert Sigvard Emanuel\">Danbom, Master Gilbert Sigvard Emanuel</td><td style=\"text-align:left\" title=\"0.3333\">0.3333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Stanton, IA\">Stanton, IA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"617\">617</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aks, Master Philip\">Aks, Master Philip</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"London, England Norfolk, VA\">London, England Norfolk, VA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"392091\">392091</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"359\">359</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Caldwell, Master Alden Gates\">Caldwell, Master Alden Gates</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bangkok, Thailand / Roseville, IL\">Bangkok, Thailand / Roseville, IL</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"545\">545</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Richards, Master George Sidney\">Richards, Master George Sidney</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Cornwall / Akron, OH\">Cornwall / Akron, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"340\">340</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Becker, Master Richard F.\">Becker, Master Richard F.</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Guntur, India / Benton Harbour, MI\">Guntur, India / Benton Harbour, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"230136 L39\">230136 L39</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"763\">763</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Dean, Master Bertram Vere\">Dean, Master Bertram Vere</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Devon, England Wichita, KS\">Devon, England Wichita, KS</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"426\">426</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Hamalainen, Master Viljo\">Hamalainen, Master Viljo</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Detroit, MI\">Detroit, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"479\">479</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"LaRoche, Miss Louise\">LaRoche, Miss Louise</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Haiti\">Paris / Haiti</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"628\">628</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andersson, Miss Ellis Anna Maria\">Andersson, Miss Ellis Anna Maria</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Sweden Winnipeg, MN\">Sweden Winnipeg, MN</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"492\">492</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Mallet, Master Andre\">Mallet, Master Andre</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Montreal, PQ\">Paris / Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"513\">513</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Navratil, Master Edmond Roger\">Navratil, Master Edmond Roger</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Nice, France\">Nice, France</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"230080 L26\">230080 L26</td><td style=\"text-align:left\" title=\"D\">D</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"538\">538</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Quick, Miss Phyllis May\">Quick, Miss Phyllis May</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Plymouth, Devon / Detroit, MI\">Plymouth, Devon / Detroit, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"586\">586</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Wells, Master Ralph Lester\">Wells, Master Ralph Lester</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Cornwall / Akron, OH\">Cornwall / Akron, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"645\">645</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aspland, Master Edvin Rojj Felix\">Aspland, Master Edvin Rojj Felix</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Sweden Worcester, MA\">Sweden Worcester, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"658\">658</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baclini, Miss Eugenie\">Baclini, Miss Eugenie</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Syria New York, NY\">Syria New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"738\">738</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Coutts, Master Neville\">Coutts, Master Neville</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"England Brooklyn, NY\">England Brooklyn, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"480\">480</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"LaRoche, Miss Simonne\">LaRoche, Miss Simonne</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Haiti\">Paris / Haiti</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 20,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// sort by several columns\n",
    "withAges.sortedBy {columns(age, name)}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"764\">764</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Dean, Miss Elizabeth Gladys (Millvena)\">Dean, Miss Elizabeth Gladys (Millvena)</td><td style=\"text-align:left\" title=\"0.1667\">0.1667</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Devon, England Wichita, KS\">Devon, England Wichita, KS</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"752\">752</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Danbom, Master Gilbert Sigvard Emanuel\">Danbom, Master Gilbert Sigvard Emanuel</td><td style=\"text-align:left\" title=\"0.3333\">0.3333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Stanton, IA\">Stanton, IA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"617\">617</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aks, Master Philip\">Aks, Master Philip</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"London, England Norfolk, VA\">London, England Norfolk, VA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"392091\">392091</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"359\">359</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Caldwell, Master Alden Gates\">Caldwell, Master Alden Gates</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bangkok, Thailand / Roseville, IL\">Bangkok, Thailand / Roseville, IL</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"545\">545</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Richards, Master George Sidney\">Richards, Master George Sidney</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Cornwall / Akron, OH\">Cornwall / Akron, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"340\">340</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Becker, Master Richard F.\">Becker, Master Richard F.</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Guntur, India / Benton Harbour, MI\">Guntur, India / Benton Harbour, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"230136 L39\">230136 L39</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"763\">763</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Dean, Master Bertram Vere\">Dean, Master Bertram Vere</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Devon, England Wichita, KS\">Devon, England Wichita, KS</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"426\">426</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Hamalainen, Master Viljo\">Hamalainen, Master Viljo</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Detroit, MI\">Detroit, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"479\">479</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"LaRoche, Miss Louise\">LaRoche, Miss Louise</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Haiti\">Paris / Haiti</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"628\">628</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andersson, Miss Ellis Anna Maria\">Andersson, Miss Ellis Anna Maria</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Sweden Winnipeg, MN\">Sweden Winnipeg, MN</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"492\">492</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Mallet, Master Andre\">Mallet, Master Andre</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Montreal, PQ\">Paris / Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"513\">513</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Navratil, Master Edmond Roger\">Navratil, Master Edmond Roger</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Nice, France\">Nice, France</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"230080 L26\">230080 L26</td><td style=\"text-align:left\" title=\"D\">D</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"538\">538</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Quick, Miss Phyllis May\">Quick, Miss Phyllis May</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Plymouth, Devon / Detroit, MI\">Plymouth, Devon / Detroit, MI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"586\">586</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Wells, Master Ralph Lester\">Wells, Master Ralph Lester</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Cornwall / Akron, OH\">Cornwall / Akron, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"645\">645</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aspland, Master Edvin Rojj Felix\">Aspland, Master Edvin Rojj Felix</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Sweden Worcester, MA\">Sweden Worcester, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"658\">658</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baclini, Miss Eugenie\">Baclini, Miss Eugenie</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Syria New York, NY\">Syria New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"738\">738</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Coutts, Master Neville\">Coutts, Master Neville</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"England Brooklyn, NY\">England Brooklyn, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"480\">480</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"LaRoche, Miss Simonne\">LaRoche, Miss Simonne</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris / Haiti\">Paris / Haiti</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 21,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// another way\n",
    "withAges.sortedBy(withAges.age, withAges.name)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Add Columns"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">year</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1883.0\">1883.0</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1910.0\">1910.0</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1882.0\">1882.0</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1911.0833\">1911.0833</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1849.0\">1849.0</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1873.0\">1873.0</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1854.0\">1854.0</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1841.0\">1841.0</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1893.0\">1893.0</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1862.0\">1862.0</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1888.0\">1888.0</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1876.0\">1876.0</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1875.0\">1875.0</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1886.0\">1886.0</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 22,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// add new column and store result in a new field\n",
    "val withYear = withAges.add(\"year\") {1912 - age}\n",
    "withYear"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "year [Dbl][633]: 1883, 1910, 1882, 1887, 1911.083, 1865, 1849, 1873, 1854, 1841, 1865, 1893, 1862, 1..."
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// check new column\n",
    "withYear.year"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">year</th><th style=\"text-align:left\">died</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1883.0\">1883.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1910.0\">1910.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1882.0\">1882.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1911.0833\">1911.0833</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1849.0\">1849.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1873.0\">1873.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1854.0\">1854.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1841.0\">1841.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1893.0\">1893.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1862.0\">1862.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1888.0\">1888.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1876.0\">1876.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1875.0\">1875.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1886.0\">1886.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 24,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// add several columns\n",
    "withAges.add {\n",
    "    \"year\" {1912-age}\n",
    "    \"died\" {survived == 0}\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">year</th><th style=\"text-align:left\">died</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1883.0\">1883.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1910.0\">1910.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1882.0\">1882.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1911.0833\">1911.0833</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1849.0\">1849.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1873.0\">1873.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1854.0\">1854.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1841.0\">1841.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1893.0\">1893.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1862.0\">1862.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1888.0\">1888.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1876.0\">1876.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1875.0\">1875.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1886.0\">1886.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"true\">true</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td><td style=\"text-align:left\" title=\"false\">false</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 25,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// plus is overloaded for adding columns\n",
    "withAges + {\n",
    "    \"year\" {1912-age}\n",
    "    \"died\" {survived == 0}\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [],
   "source": [
    "// another way to build new column via column arithmetics\n",
    "val birthYear = withAges.age * (-1) + 1912"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">year</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1883.0\">1883.0</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1910.0\">1910.0</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1882.0\">1882.0</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1911.0833\">1911.0833</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1849.0\">1849.0</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1873.0\">1873.0</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1854.0\">1854.0</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1841.0\">1841.0</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1893.0\">1893.0</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1862.0\">1862.0</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1888.0\">1888.0</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1876.0\">1876.0</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1875.0\">1875.0</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1865.0\">1865.0</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1886.0\">1886.0</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1887.0\">1887.0</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 27,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// new column can be added to dataframe with '+' operator\n",
    "withAges + birthYear.rename(\"year\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">row duplicate</th><th style=\"text-align:left\">pclass duplicate</th><th style=\"text-align:left\">survived duplicate</th><th style=\"text-align:left\">name duplicate</th><th style=\"text-align:left\">age duplicate</th><th style=\"text-align:left\">embarked duplicate</th><th style=\"text-align:left\">home duplicate</th><th style=\"text-align:left\">room duplicate</th><th style=\"text-align:left\">ticket duplicate</th><th style=\"text-align:left\">boat duplicate</th><th style=\"text-align:left\">sex duplicate</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 28,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Iterable of columns can also be added with '+' \n",
    "withAges + withAges.columns.map {it.rename(it.name + \" duplicate\")}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Remove columns"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"14\">14</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"15\">15</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// remove single column\n",
    "df.remove{ticket}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 30,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// remove several columns\n",
    "df.remove {columns(row, pclass, ticket, room, survived)}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 31,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// remove several columns by column instances\n",
    "df.remove(df.row, df.pclass)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"null\">null</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 32,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// '-' operator can also be used for removing columns\n",
    "df - {row} - {pclass} - {room}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Group"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">n</th></tr><tr><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"573\">573</td></tr><tr><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"203\">203</td></tr><tr><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"492\">492</td></tr><tr><td style=\"text-align:left\" title=\"Queenstown\">Queenstown</td><td style=\"text-align:left\" title=\"45\">45</td></tr></table></body></html>"
      ]
     },
     "execution_count": 33,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// group by single column\n",
    "df.groupBy{ embarked }.count()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">n</th></tr><tr><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"307\">307</td></tr><tr><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"156\">156</td></tr><tr><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"708\">708</td></tr><tr><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"142\">142</td></tr></table></body></html>"
      ]
     },
     "execution_count": 34,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// group by several columns\n",
    "df.groupBy{ columns(sex, survived) }.count()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">n</th></tr><tr><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"307\">307</td></tr><tr><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"156\">156</td></tr><tr><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"708\">708</td></tr><tr><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"142\">142</td></tr></table></body></html>"
      ]
     },
     "execution_count": 35,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// another way\n",
    "df.groupBy(df.sex, df.survived).count()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">total count</th><th style=\"text-align:left\">survival rate</th><th style=\"text-align:left\">average age</th><th style=\"text-align:left\">median age</th><th style=\"text-align:left\">youngest</th><th style=\"text-align:left\">youngest age</th><th style=\"text-align:left\">oldest</th><th style=\"text-align:left\">oldest age</th></tr><tr><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"463\">463</td><td style=\"text-align:left\" title=\"39.740820734341256\">39.740820734341256</td><td style=\"text-align:left\" title=\"29.857271274298057\">29.857271274298057</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Dean, Miss Elizabeth Gladys (Millvena)\">Dean, Miss Elizabeth Gladys (Millvena)</td><td style=\"text-align:left\" title=\"0.1667\">0.1667</td><td style=\"text-align:left\" title=\"Mitchell, Mr Henry Michael\">Mitchell, Mr Henry Michael</td><td style=\"text-align:left\" title=\"71.0\">71.0</td></tr><tr><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"133\">133</td><td style=\"text-align:left\" title=\"60.902255639097746\">60.902255639097746</td><td style=\"text-align:left\" title=\"35.6015037593985\">35.6015037593985</td><td style=\"text-align:left\" title=\"22.0\">22.0</td><td style=\"text-align:left\" title=\"LaRoche, Miss Louise\">LaRoche, Miss Louise</td><td style=\"text-align:left\" title=\"1.0\">1.0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td></tr><tr><td style=\"text-align:left\" title=\"Queenstown\">Queenstown</td><td style=\"text-align:left\" title=\"31\">31</td><td style=\"text-align:left\" title=\"38.70967741935484\">38.70967741935484</td><td style=\"text-align:left\" title=\"29.032258064516128\">29.032258064516128</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Carr, Miss Helen\">Carr, Miss Helen</td><td style=\"text-align:left\" title=\"16.0\">16.0</td><td style=\"text-align:left\" title=\"Dewan, Mr Frank\">Dewan, Mr Frank</td><td style=\"text-align:left\" title=\"65.0\">65.0</td></tr><tr><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"66.66666666666666\">66.66666666666666</td><td style=\"text-align:left\" title=\"47.833333333333336\">47.833333333333336</td><td style=\"text-align:left\" title=\"47.5\">47.5</td><td style=\"text-align:left\" title=\"Ovies y Rodriguez, Mr Servando\">Ovies y Rodriguez, Mr Servando</td><td style=\"text-align:left\" title=\"28.0\">28.0</td><td style=\"text-align:left\" title=\"Stone, Mrs George Nelson (Martha E.)\">Stone, Mrs George Nelson (Martha E.)</td><td style=\"text-align:left\" title=\"62.0\">62.0</td></tr></table></body></html>"
      ]
     },
     "execution_count": 36,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Various summarization operations on grouped data frame\n",
    "withAges.groupBy{ embarked }.summarize {\n",
    "    \n",
    "    \"total count\" { size } // lamba expressions are computed for every group. Type of receiver: TypedDataFrame<*>\n",
    "    \"survival rate\" { count { survived == 1 }.toDouble() / size * 100 }\n",
    "    \n",
    "    \"average age\" { age.mean() } // column operations are also supported\n",
    "    \"median age\" { age.median() }\n",
    "    \n",
    "    val youngest = find { minBy {age}!! } // 'find' builds data frame, collecting one row for every group\n",
    "    \"youngest\" (youngest.name) // columns of collected data frame are passed in round parenthesis '()'\n",
    "    \"youngest age\" (youngest.age)\n",
    "    \n",
    "     val oldest = find { maxBy {age}!! }\n",
    "    \"oldest\" (oldest.name)\n",
    "    \"oldest age\" (oldest.age)\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Misc"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1313"
      ]
     },
     "execution_count": 37,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "df.size"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "68"
      ]
     },
     "execution_count": 38,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "withAges.count {age > 50 }"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"764\">764</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Dean, Miss Elizabeth Gladys (Millvena)\">Dean, Miss Elizabeth Gladys (Millvena)</td><td style=\"text-align:left\" title=\"0.1667\">0.1667</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Devon, England Wichita, KS\">Devon, England Wichita, KS</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"752\">752</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Danbom, Master Gilbert Sigvard Emanuel\">Danbom, Master Gilbert Sigvard Emanuel</td><td style=\"text-align:left\" title=\"0.3333\">0.3333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Stanton, IA\">Stanton, IA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"359\">359</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Caldwell, Master Alden Gates\">Caldwell, Master Alden Gates</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bangkok, Thailand / Roseville, IL\">Bangkok, Thailand / Roseville, IL</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"13\">13</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"545\">545</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Richards, Master George Sidney\">Richards, Master George Sidney</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Cornwall / Akron, OH\">Cornwall / Akron, OH</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"617\">617</td><td style=\"text-align:left\" title=\"3rd\">3rd</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Aks, Master Philip\">Aks, Master Philip</td><td style=\"text-align:left\" title=\"0.8333\">0.8333</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"London, England Norfolk, VA\">London, England Norfolk, VA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"392091\">392091</td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table></body></html>"
      ]
     },
     "execution_count": 39,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "withAges.sortedBy{age}.take(5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"74\">74</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead)\">Crosby, Mrs Edward Gifford (Catherine Elizabeth...</td><td style=\"text-align:left\" title=\"69.0\">69.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"73\">73</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Crosby, Captain Edward Gifford\">Crosby, Captain Edward Gifford</td><td style=\"text-align:left\" title=\"70.0\">70.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(269)\">(269)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"120\">120</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Goldschmidt, Mr George B.\">Goldschmidt, Mr George B.</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"506\">506</td><td style=\"text-align:left\" title=\"2nd\">2nd</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Mitchell, Mr Henry Michael\">Mitchell, Mr Henry Michael</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Guernsey / Montclair, NJ and/or Toledo, Ohio\">Guernsey / Montclair, NJ and/or Toledo, Ohio</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr></table></body></html>"
      ]
     },
     "execution_count": 40,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "withAges.sortedBy{age}.takeLast(5)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## List <-> DataFrame conversion"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 41,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[Allen, Miss Elisabeth Walton, Allison, Miss Helen Loraine, Allison, Mr Hudson Joshua Creighton, Allison, Mrs Hudson J.C. (Bessie Waldo Daniels), Allison, Master Hudson Trevor]"
      ]
     },
     "execution_count": 41,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// 'rows' field is Iterable<TypedDataFrameRow<*>> so it can be used in any stdlib extensions for Iterable\n",
    "df.rows.map {it.name}.take(5)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">first</th><th style=\"text-align:left\">second</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"2.0\">2.0</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"3.0\">3.0</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"4.0\">4.0</td></tr></table></body></html>"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Sample List\n",
    "data class Item(val first: Int, val second: Double)\n",
    "val itemsList = listOf(Item(1,2.0), Item(2, 3.0), Item(3, 4.0))\n",
    "\n",
    "// List -> DataFrame by reflection\n",
    "itemsList.toDataFrame()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">a</th><th style=\"text-align:left\">b</th><th style=\"text-align:left\">c</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"2.0\">2.0</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"3.0\">3.0</td><td style=\"text-align:left\" title=\"6.0\">6.0</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"4.0\">4.0</td><td style=\"text-align:left\" title=\"12.0\">12.0</td></tr></table></body></html>"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// List -> DataFrame by mappings\n",
    "itemsList.toDataFrame {\n",
    "    \"a\" {first}\n",
    "    \"b\" {second}\n",
    "    \"c\" {first*second}\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "metadata": {},
   "outputs": [],
   "source": [
    "// Convert data frame to a list of data class items\n",
    "val passengers = df.toList(\"Passenger\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "class Line_139_jupyter$Passenger"
      ]
     },
     "execution_count": 45,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Check type of the element\n",
    "passengers[0].javaClass"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "Passenger(row=10, pclass=1st, survived=0, name=Artagaveytia, Mr Ramon, age=71.0, embarked=Cherbourg, home=Montevideo, Uruguay, room=, ticket=, boat=(22), sex=male)"
      ]
     },
     "execution_count": 46,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// Do any list operations\n",
    "passengers.maxBy {it.age ?: .0}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Column-specific extensions for TypedDataFrame"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 47,
   "metadata": {},
   "outputs": [],
   "source": [
    "// create marker interface to write column-specific extensions for data frame\n",
    "@DataFrameType\n",
    "interface SimplePerson {\n",
    "    val name: String\n",
    "    val age: Double\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 48,
   "metadata": {},
   "outputs": [],
   "source": [
    "// create extension for any data frame with fields 'name' and 'age'\n",
    "fun TypedDataFrame<SimplePerson>.getOlderThan(minAge: Double) = filter {age > minAge}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"29\">29</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bonnell, Miss Elizabeth\">Bonnell, Miss Elizabeth</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Birkdale, England Cleveland, Ohio\">Birkdale, England Cleveland, Ohio</td><td style=\"text-align:left\" title=\"C-103\">C-103</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"38\">38</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Brown, Mrs John Murray (Caroline Lane Lamson)\">Brown, Mrs John Murray (Caroline Lane Lamson)</td><td style=\"text-align:left\" title=\"59.0\">59.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belmont, MA\">Belmont, MA</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"D\">D</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"39\">39</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bucknell, Mrs William Robert (Emma Eliza Ward)\">Bucknell, Mrs William Robert (Emma Eliza Ward)</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Philadelphia, PA\">Philadelphia, PA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"42\">42</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Candee, Mrs Edward (Helen Churchill Hungerford)\">Candee, Mrs Edward (Helen Churchill Hungerford)</td><td style=\"text-align:left\" title=\"53.0\">53.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Washington, DC\">Washington, DC</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"43\">43</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Cardeza, Mrs James Warburton Martinez (Charlotte Wardle Drake)\">Cardeza, Mrs James Warburton Martinez (Charlott...</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Germantown, Philadelphia, PA\">Germantown, Philadelphia, PA</td><td style=\"text-align:left\" title=\"B-51/3/5\">B-51/3/5</td><td style=\"text-align:left\" title=\"17755 L512 6s\">17755 L512 6s</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"68\">68</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Compton, Mrs Alexander Taylor (Mary Eliza Ingersoll)\">Compton, Mrs Alexander Taylor (Mary Eliza Inger...</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Lakewood, NJ\">Lakewood, NJ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"14\">14</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"71\">71</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Cornell, Mrs Robert Clifford (Malvina Helen Lamson)\">Cornell, Mrs Robert Clifford (Malvina Helen Lam...</td><td style=\"text-align:left\" title=\"55.0\">55.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"73\">73</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Crosby, Captain Edward Gifford\">Crosby, Captain Edward Gifford</td><td style=\"text-align:left\" title=\"70.0\">70.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(269)\">(269)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"74\">74</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead)\">Crosby, Mrs Edward Gifford (Catherine Elizabeth...</td><td style=\"text-align:left\" title=\"69.0\">69.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Milwaukee, WI\">Milwaukee, WI</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"95\">95</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Eustis, Miss Elizabeth Mussey\">Eustis, Miss Elizabeth Mussey</td><td style=\"text-align:left\" title=\"53.0\">53.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Brookline, MA\">Brookline, MA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"104\">104</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Fortune, Mr Mark\">Fortune, Mr Mark</td><td style=\"text-align:left\" title=\"64.0\">64.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Winnipeg, MB\">Winnipeg, MB</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"105\">105</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Fortune, Mrs Mark (Mary McDougald)\">Fortune, Mrs Mark (Mary McDougald)</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Winnipeg, MB\">Winnipeg, MB</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"111\">111</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Frolicher-Stehli, Mr Maxmillian\">Frolicher-Stehli, Mr Maxmillian</td><td style=\"text-align:left\" title=\"60.0\">60.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Zurich, Switzerland\">Zurich, Switzerland</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"120\">120</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Goldschmidt, Mr George B.\">Goldschmidt, Mr George B.</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"121\">121</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Gracie, Colonel Archibald IV\">Gracie, Colonel Archibald IV</td><td style=\"text-align:left\" title=\"54.0\">54.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Washington, DC\">Washington, DC</td><td style=\"text-align:left\" title=\"C-51\">C-51</td><td style=\"text-align:left\" title=\"113780 L28 10s\">113780 L28 10s</td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"124\">124</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Graham, Mrs William Thompson (Edith Junkins)\">Graham, Mrs William Thompson (Edith Junkins)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Greenwich, CT\">Greenwich, CT</td><td style=\"text-align:left\" title=\"C-91\">C-91</td><td style=\"text-align:left\" title=\"17582 L153 9s 3d\">17582 L153 9s 3d</td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"135\">135</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Hays, Mr Charles Melville\">Hays, Mr Charles Melville</td><td style=\"text-align:left\" title=\"55.0\">55.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(307)\">(307)</td><td style=\"text-align:left\" title=\"male\">male</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 49,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// extension works even for objects that were created before marker interface declaration\n",
    "withAges.getOlderThan(50.0)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "@DataFrameType(isOpen = true)\n",
       "interface Person{\n",
       "\tval name: String\n",
       "\tval age: Double\n",
       "\tval home: String\n",
       "\tval sex: String\n",
       "}"
      ]
     },
     "execution_count": 50,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// code for marker interface can be auto-generated\n",
    "// 'getScheme' method returns generated code without execution\n",
    "withAges.select{columns(name,age,home,sex)}.generateInterface(\"Person\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "metadata": {},
   "outputs": [],
   "source": [
    "// 'extractScheme' method generates and executes code\n",
    "withAges.select{columns(name,age,home,sex)}.extractInterface(\"Person\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "metadata": {},
   "outputs": [],
   "source": [
    "// Now interface 'Person' is available, so we can write an extension method, \n",
    "// that will work for any data frame with these four columns\n",
    "fun TypedDataFrame<Person>.addSummary() = add(\"summary\"){\"$sex $name $age y.o. from $home\"}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">row</th><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">survived</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">age</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th><th style=\"text-align:left\">summary</th></tr><tr><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"29.0\">29.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Allen, Miss Elisabeth Walton 29.0 y.o. from St Louis, MO\">female Allen, Miss Elisabeth Walton 29.0 y.o. f...</td></tr><tr><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"2.0\">2.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Allison, Miss Helen Loraine 2.0 y.o. from Montreal, PQ / Chesterville, ON\">female Allison, Miss Helen Loraine 2.0 y.o. fro...</td></tr><tr><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"30.0\">30.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Allison, Mr Hudson Joshua Creighton 30.0 y.o. from Montreal, PQ / Chesterville, ON\">male Allison, Mr Hudson Joshua Creighton 30.0 y...</td></tr><tr><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Allison, Mrs Hudson J.C. (Bessie Waldo Daniels) 25.0 y.o. from Montreal, PQ / Chesterville, ON\">female Allison, Mrs Hudson J.C. (Bessie Waldo D...</td></tr><tr><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"0.9167\">0.9167</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Allison, Master Hudson Trevor 0.9167 y.o. from Montreal, PQ / Chesterville, ON\">male Allison, Master Hudson Trevor 0.9167 y.o. ...</td></tr><tr><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Anderson, Mr Harry 47.0 y.o. from New York, NY\">male Anderson, Mr Harry 47.0 y.o. from New York...</td></tr><tr><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"63.0\">63.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Andrews, Miss Kornelia Theodosia 63.0 y.o. from Hudson, NY\">female Andrews, Miss Kornelia Theodosia 63.0 y....</td></tr><tr><td style=\"text-align:left\" title=\"8\">8</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"39.0\">39.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Andrews, Mr Thomas, jr 39.0 y.o. from Belfast, NI\">male Andrews, Mr Thomas, jr 39.0 y.o. from Belf...</td></tr><tr><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"58.0\">58.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Appleton, Mrs Edward Dale (Charlotte Lamson) 58.0 y.o. from Bayside, Queens, NY\">female Appleton, Mrs Edward Dale (Charlotte Lam...</td></tr><tr><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"71.0\">71.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Artagaveytia, Mr Ramon 71.0 y.o. from Montevideo, Uruguay\">male Artagaveytia, Mr Ramon 71.0 y.o. from Mont...</td></tr><tr><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Astor, Colonel John Jacob 47.0 y.o. from New York, NY\">male Astor, Colonel John Jacob 47.0 y.o. from N...</td></tr><tr><td style=\"text-align:left\" title=\"12\">12</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"19.0\">19.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Astor, Mrs John Jacob (Madeleine Talmadge Force) 19.0 y.o. from New York, NY\">female Astor, Mrs John Jacob (Madeleine Talmadg...</td></tr><tr><td style=\"text-align:left\" title=\"16\">16</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"50.0\">50.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Baxter, Mrs James (Helene DeLaudeniere Chaput) 50.0 y.o. from Montreal, PQ\">female Baxter, Mrs James (Helene DeLaudeniere C...</td></tr><tr><td style=\"text-align:left\" title=\"17\">17</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"24.0\">24.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Baxter, Mr Quigg Edmond 24.0 y.o. from Montreal, PQ\">male Baxter, Mr Quigg Edmond 24.0 y.o. from Mon...</td></tr><tr><td style=\"text-align:left\" title=\"18\">18</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"36.0\">36.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Beattie, Mr Thomson 36.0 y.o. from Winnipeg, MN\">male Beattie, Mr Thomson 36.0 y.o. from Winnipe...</td></tr><tr><td style=\"text-align:left\" title=\"19\">19</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"37.0\">37.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Beckwith, Mr Richard Leonard 37.0 y.o. from New York, NY\">male Beckwith, Mr Richard Leonard 37.0 y.o. fro...</td></tr><tr><td style=\"text-align:left\" title=\"20\">20</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"47.0\">47.0</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td><td style=\"text-align:left\" title=\"female Beckwith, Mrs Richard Leonard (Sallie Monypeny) 47.0 y.o. from New York, NY\">female Beckwith, Mrs Richard Leonard (Sallie Mo...</td></tr><tr><td style=\"text-align:left\" title=\"21\">21</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Behr, Mr Karl Howell\">Behr, Mr Karl Howell</td><td style=\"text-align:left\" title=\"26.0\">26.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"C-148\">C-148</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Behr, Mr Karl Howell 26.0 y.o. from New York, NY\">male Behr, Mr Karl Howell 26.0 y.o. from New Yo...</td></tr><tr><td style=\"text-align:left\" title=\"22\">22</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"0\">0</td><td style=\"text-align:left\" title=\"Birnbaum, Mr Jakob\">Birnbaum, Mr Jakob</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"San Francisco, CA\">San Francisco, CA</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(148)\">(148)</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Birnbaum, Mr Jakob 25.0 y.o. from San Francisco, CA\">male Birnbaum, Mr Jakob 25.0 y.o. from San Fran...</td></tr><tr><td style=\"text-align:left\" title=\"23\">23</td><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"1\">1</td><td style=\"text-align:left\" title=\"Bishop, Mr Dickinson H.\">Bishop, Mr Dickinson H.</td><td style=\"text-align:left\" title=\"25.0\">25.0</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Dowagiac, MI\">Dowagiac, MI</td><td style=\"text-align:left\" title=\"B-49\">B-49</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"7\">7</td><td style=\"text-align:left\" title=\"male\">male</td><td style=\"text-align:left\" title=\"male Bishop, Mr Dickinson H. 25.0 y.o. from Dowagiac, MI\">male Bishop, Mr Dickinson H. 25.0 y.o. from Dow...</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 53,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// for example, it works for 'withAges' data frame\n",
    "withAges.addSummary()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "metadata": {},
   "outputs": [],
   "source": [
    "// data frame can also be converted to a list of objects implementing 'Person' interface that was generated above\n",
    "val persons = withAges.toList<Person>()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "class Line_176_jupyter$PersonImpl"
      ]
     },
     "execution_count": 55,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// check element type\n",
    "persons[0].javaClass"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[PersonImpl(age=29.0, home=St Louis, MO, name=Allen, Miss Elisabeth Walton, sex=female), PersonImpl(age=2.0, home=Montreal, PQ / Chesterville, ON, name=Allison, Miss Helen Loraine, sex=female), PersonImpl(age=30.0, home=Montreal, PQ / Chesterville, ON, name=Allison, Mr Hudson Joshua Creighton, sex=male), PersonImpl(age=25.0, home=Montreal, PQ / Chesterville, ON, name=Allison, Mrs Hudson J.C. (Bessie Waldo Daniels), sex=female), PersonImpl(age=0.9167, home=Montreal, PQ / Chesterville, ON, name=Allison, Master Hudson Trevor, sex=male), PersonImpl(age=47.0, home=New York, NY, name=Anderson, Mr Harry, sex=male), PersonImpl(age=63.0, home=Hudson, NY, name=Andrews, Miss Kornelia Theodosia, sex=female), PersonImpl(age=39.0, home=Belfast, NI, name=Andrews, Mr Thomas, jr, sex=male), PersonImpl(age=58.0, home=Bayside, Queens, NY, name=Appleton, Mrs Edward Dale (Charlotte Lamson), sex=female), PersonImpl(age=71.0, home=Montevideo, Uruguay, name=Artagaveytia, Mr Ramon, sex=male), PersonImpl(age=47.0, home=New York, NY, name=Astor, Colonel John Jacob, sex=male), PersonImpl(age=19.0, home=New York, NY, name=Astor, Mrs John Jacob (Madeleine Talmadge Force), sex=female), PersonImpl(age=50.0, home=Montreal, PQ, name=Baxter, Mrs James (Helene DeLaudeniere Chaput), sex=female), PersonImpl(age=24.0, home=Montreal, PQ, name=Baxter, Mr Quigg Edmond, sex=male), PersonImpl(age=36.0, home=Winnipeg, MN, name=Beattie, Mr Thomson, sex=male), PersonImpl(age=37.0, home=New York, NY, name=Beckwith, Mr Richard Leonard, sex=male), PersonImpl(age=47.0, home=New York, NY, name=Beckwith, Mrs Richard Leonard (Sallie Monypeny), sex=female), PersonImpl(age=26.0, home=New York, NY, name=Behr, Mr Karl Howell, sex=male), PersonImpl(age=25.0, home=San Francisco, CA, name=Birnbaum, Mr Jakob, sex=male), PersonImpl(age=25.0, home=Dowagiac, MI, name=Bishop, Mr Dickinson H., sex=male), PersonImpl(age=19.0, home=Dowagiac, MI, name=Bishop, Mrs Dickinson H. (Helen Walton), sex=female), PersonImpl(age=28.0, home=Stockholm, Sweden / Washington, DC, name=Bjornstrm-Steffansson, Mr Mauritz Hakan, sex=male), PersonImpl(age=45.0, home=Trenton, NJ, name=Blackwell, Mr Stephen Weart, sex=male), PersonImpl(age=39.0, home=Glen Ridge, NJ, name=Blank, Mr Henry, sex=male), PersonImpl(age=30.0, home=Youngstown, OH, name=Bonnell, Miss Caroline, sex=female), PersonImpl(age=58.0, home=Birkdale, England Cleveland, Ohio, name=Bonnell, Miss Elizabeth, sex=female), PersonImpl(age=45.0, home=Cooperstown, NY, name=Bowen, Miss Grace Scott, sex=female), PersonImpl(age=22.0, home=St Leonards-on-Sea, England Ohio, name=Bowerman, Miss Elsie Edith, sex=female), PersonImpl(age=41.0, home=Pomeroy, WA, name=Brady, Mr John Bertram, sex=male), PersonImpl(age=48.0, home=Omaha, NE, name=Brandeis, Mr Emil, sex=male), PersonImpl(age=44.0, home=Denver, CO, name=Brown, Mrs James Joseph (Margaret Molly Tobin), sex=female), PersonImpl(age=59.0, home=Belmont, MA, name=Brown, Mrs John Murray (Caroline Lane Lamson), sex=female), PersonImpl(age=60.0, home=Philadelphia, PA, name=Bucknell, Mrs William Robert (Emma Eliza Ward), sex=female), PersonImpl(age=45.0, home=Washington, DC, name=Butt, Major Archibald Willingham, sex=male), PersonImpl(age=53.0, home=Washington, DC, name=Candee, Mrs Edward (Helen Churchill Hungerford), sex=female), PersonImpl(age=58.0, home=Germantown, Philadelphia, PA, name=Cardeza, Mrs James Warburton Martinez (Charlotte Wardle Drake), sex=female), PersonImpl(age=36.0, home=Austria-Hungary / Germantown, Philadelphia, PA, name=Cardeza, Mr Thomas Drake Martinez, sex=male), PersonImpl(age=33.0, home=New York, NY, name=Carlsson, Mr Frans Olof, sex=male), PersonImpl(age=36.0, home=Bryn Mawr, PA, name=Carter, Mr William Ernest, sex=male), PersonImpl(age=36.0, home=Bryn Mawr, PA, name=Carter, Mrs William Ernest (Lucile Polk), sex=female), PersonImpl(age=14.0, home=Bryn Mawr, PA, name=Carter, Miss Lucile Polk, sex=female), PersonImpl(age=11.0, home=Bryn Mawr, PA, name=Carter, Master William T. II, sex=male), PersonImpl(age=49.0, home=Ascot, Berkshire / Rochester, NY, name=Case, Mr Howard Brown, sex=male), PersonImpl(age=36.0, home=Little Onn Hall, Staffs, name=Cavendish, Mr Tyrell William, sex=male), PersonImpl(age=46.0, home=Amenia, ND, name=Chaffee, Mr Herbert Fuller, sex=male), PersonImpl(age=47.0, home=Amenia, ND, name=Chaffee, Mrs Herbert Fuller (Carrie Constance Toogood), sex=female), PersonImpl(age=27.0, home=New York, NY / Ithaca, NY, name=Chambers, Mr Norman Campbell, sex=male), PersonImpl(age=31.0, home=New York, NY / Ithaca, NY, name=Chambers, Mrs Norman Campbell (Bertha Griggs), sex=female), PersonImpl(age=27.0, home=Los Angeles, CA, name=Clark, Mr Walter Miller, sex=male), PersonImpl(age=26.0, home=Los Angeles, CA, name=Clark, Mrs Walter Miller (Virginia McDowell), sex=female), PersonImpl(age=64.0, home=Lakewood, NJ, name=Compton, Mrs Alexander Taylor (Mary Eliza Ingersoll), sex=female), PersonImpl(age=37.0, home=Lakewood, NJ, name=Compton, Mr Alexander Taylor, Jr, sex=male), PersonImpl(age=39.0, home=Lakewood, NJ, name=Compton, Miss Sara Rebecca, sex=female), PersonImpl(age=55.0, home=New York, NY, name=Cornell, Mrs Robert Clifford (Malvina Helen Lamson), sex=female), PersonImpl(age=70.0, home=Milwaukee, WI, name=Crosby, Captain Edward Gifford, sex=male), PersonImpl(age=69.0, home=Milwaukee, WI, name=Crosby, Mrs Edward Gifford (Catherine Elizabeth Halstead), sex=female), PersonImpl(age=36.0, home=Milwaukee, WI, name=Crosby, Miss Harriet R., sex=female), PersonImpl(age=39.0, home=New York, NY, name=Cumings, Mr John Bradley, sex=male), PersonImpl(age=38.0, home=New York, NY, name=Cumings, Mrs John Bradley (Florence Briggs Thayer), sex=female), PersonImpl(age=27.0, home=Philadelphia, PA, name=Daniel, Mr Robert Williams, sex=male), PersonImpl(age=31.0, home=Montreal, PQ, name=Davidson, Mr Thornton, sex=male), PersonImpl(age=27.0, home=Montreal, PQ, name=Davidson, Mrs Thornton (Orian Hays), sex=female), PersonImpl(age=31.0, home=Calgary, AB, name=Dick, Mr Albert Adrian, sex=male), PersonImpl(age=17.0, home=Calgary, AB, name=Dick, Mrs Albert Adrian Vera Gillespie, sex=female), PersonImpl(age=4.0, home=San Francisco, CA, name=Dodge, Master Washington, sex=male), PersonImpl(age=27.0, home=Montreal, PQ, name=Douglas, Mrs Frederick Charles (Suzette Baxter), sex=female), PersonImpl(age=50.0, home=Deephaven, MN / Cedar Rapids, IA, name=Douglas, Mr Walter Donald, sex=male), PersonImpl(age=48.0, home=Deephaven, MN / Cedar Rapids, IA, name=Douglas, Mrs Walter Donald (Mahala Dutton), sex=female), PersonImpl(age=49.0, home=London / Paris, name=Duff Gordon, Sir Cosmo Edmund, sex=male), PersonImpl(age=48.0, home=London / Paris, name=Duff Gordon, Lady (Lucille Wallace Sutherland), sex=female), PersonImpl(age=39.0, home=Philadelphia, PA, name=Dulles, Mr William Crothers, sex=male), PersonImpl(age=23.0, home=Mt Airy, Philadelphia, PA, name=Earnshaw, Mrs Boulton (Olive Potter), sex=female), PersonImpl(age=53.0, home=Brookline, MA, name=Eustis, Miss Elizabeth Mussey, sex=female), PersonImpl(age=36.0, home=New York, NY, name=Evans, Miss Edith Corse, sex=female), PersonImpl(age=30.0, home=New York, NY, name=Foreman, Mr Benjamin Laventall, sex=male), PersonImpl(age=24.0, home=Winnipeg, MB, name=Fortune, Miss Alice Elizabeth, sex=female), PersonImpl(age=19.0, home=Winnipeg, MB, name=Fortune, Mr Charles Alexander, sex=male), PersonImpl(age=28.0, home=Winnipeg, MB, name=Fortune, Miss Ethel Flora, sex=female), PersonImpl(age=23.0, home=Winnipeg, MB, name=Fortune, Miss Mabel, sex=female), PersonImpl(age=64.0, home=Winnipeg, MB, name=Fortune, Mr Mark, sex=male), PersonImpl(age=60.0, home=Winnipeg, MB, name=Fortune, Mrs Mark (Mary McDougald), sex=female), PersonImpl(age=49.0, home=New York, NY, name=Frauenthal, Dr Henry William, sex=male), PersonImpl(age=44.0, home=New York, NY, name=Frauenthal, Mr Isaac Gerald, sex=male), PersonImpl(age=22.0, home=Zurich, Switzerland, name=Frolicher, Miss Marguerite, sex=female), PersonImpl(age=60.0, home=Zurich, Switzerland, name=Frolicher-Stehli, Mr Maxmillian, sex=male), PersonImpl(age=48.0, home=Zurich, Switzerland, name=Frolicher-Stehli, Mrs Maxmillian (Margaretha Emerentia Stehli), sex=female), PersonImpl(age=37.0, home=Scituate, MA, name=Futrelle, Mr Jacques, sex=male), PersonImpl(age=35.0, home=Scituate, MA, name=Futrelle, Mrs Jacques (May Peel), sex=female), PersonImpl(age=47.0, home=St Anne's-on-Sea, Lancashire, name=Gee, Mr Arthur H., sex=male), PersonImpl(age=22.0, home=New York, NY, name=Gibson, Miss Dorothy, sex=female), PersonImpl(age=45.0, home=New York, NY, name=Gibson, Mrs Leonard (Pauline C. 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(Jane Richards), sex=female), PersonImpl(age=2.0, home=Plymouth, Devon / Detroit, MI, name=Quick, Miss Phyllis May, sex=female), PersonImpl(age=8.0, home=Plymouth, Devon / Detroit, MI, name=Quick, Miss Winifred Vera, sex=female), PersonImpl(age=36.0, home=Brighton, Sussex, name=Reeves, Mr David, sex=male), PersonImpl(age=34.0, home=Elizabeth, NJ, name=Renouf, Mr Peter Henry, sex=male), PersonImpl(age=30.0, home=Elizabeth, NJ, name=Renouf, Mrs Peter Henry (Lillian Jefferys), sex=female), PersonImpl(age=28.0, home=Spain, name=Reynaldo, Mrs Encarnacion, sex=female), PersonImpl(age=23.0, home=Paris / Montreal, PQ, name=Richard, Mr Emil, sex=male), PersonImpl(age=0.8333, home=Cornwall / Akron, OH, name=Richards, Master George Sidney, sex=male), PersonImpl(age=25.0, home=Cornwall / Akron, OH, name=Richards, Mrs Sidney (Emily Hocking), sex=female), PersonImpl(age=3.0, home=Cornwall / Akron, OH, name=Richards, Master William Rowe, sex=male), PersonImpl(age=50.0, home=London, England / Marietta, Ohio and Milwaukee, WI, name=Ridsdale, Miss Lucy, sex=female), PersonImpl(age=21.0, home=Guernsey / Wilmington, DE, name=Rugg, Miss Emily, sex=female), PersonImpl(age=25.0, home=Deer Lodge, MT, name=Shelley, Mrs William (Imanita), sex=female), PersonImpl(age=18.0, home=Finland / Minneapolis, MN, name=Silven, Miss Lyyli, sex=female), PersonImpl(age=20.0, home=Cornwall / Hancock, MI, name=Sincock, Miss Maude, sex=female), PersonImpl(age=30.0, home=Finland / Washington, DC, name=Siukonnen, Miss Anna, sex=female), PersonImpl(age=59.0, home=Sault St Marie, ON, name=Sjostedt, Mr Ernst Adolf, sex=male), PersonImpl(age=30.0, home=Halifax, NS, name=Slayter, Miss Hilda Mary, sex=female), PersonImpl(age=35.0, home=Cornwall, name=Slemen, Mr Richard James, sex=male), PersonImpl(age=22.0, home=Newark, NJ, name=Smith (Schmidt), Mr Augustus, sex=male), PersonImpl(age=25.0, home=Cornwall / Houghton, MI, name=Sobey, Mr Hayden, sex=male), PersonImpl(age=41.0, home=New York, NY, name=Stanton, Mr Samuel Ward, sex=male), PersonImpl(age=25.0, home=Catford, Kent / Detroit, MI, name=Stokes, Mr Philip Joseph, sex=male), PersonImpl(age=14.0, home=Somerset / Bernardsville, NJ, name=Sweet, Mr George, sex=male), PersonImpl(age=50.0, home=Indianapolis, IN, name=Toomey, Miss Ellen, sex=female), PersonImpl(age=22.0, home=, name=Troupiansky, Mr Moses Aaron, sex=male), PersonImpl(age=27.0, home=Bath, England / Massachusetts, name=Troutt, Miss Edwina Celia, sex=female), PersonImpl(age=29.0, home=Plymouth, England, name=Turpin, Mr William John, sex=male), PersonImpl(age=27.0, home=Plymouth, England, name=Turpin, Mrs William John (Dorothy Anne Wonnacott), sex=female), PersonImpl(age=30.0, home=Barre, Co Washington, VT, name=Veale, Mr James, sex=male), PersonImpl(age=22.0, home=Antwerp, Belgium / Stanton, OH, name=Waelens, Mr Achille, sex=male), PersonImpl(age=35.0, home=Mamaroneck, NY, name=Walcroft, Miss Nellie, sex=female), PersonImpl(age=30.0, home=Bristol, England / New Britain, CT, name=Ware, Mr John James, sex=male), PersonImpl(age=28.0, home=Bristol, England / New Britain, CT, name=Ware, Mrs John James (Florence Louise Long), sex=female), PersonImpl(age=23.0, home=, name=Ware, Mr William J., sex=male), PersonImpl(age=12.0, home=Aberdeen / Portland, OR, name=Watt, Miss Bertha, sex=female), PersonImpl(age=40.0, home=Aberdeen / Portland, OR, name=Watt, Mrs James (Bessie Inglis Milne), sex=female), PersonImpl(age=36.0, home=England / Hartford, CT, name=Webber, Miss Susan, sex=female), PersonImpl(age=28.0, home=Bromsgrove, England / Montreal, PQ, name=Weisz, Mr Leopold, sex=male), PersonImpl(age=32.0, home=Bromsgrove, England / Montreal, PQ, name=Weisz, Mrs Leopold (Mathilde), sex=female), PersonImpl(age=29.0, home=Cornwall / Akron, OH, name=Wells, Mrs Arthur H. (Addie Trevaskis), sex=female), PersonImpl(age=4.0, home=Cornwall / Akron, OH, name=Wells, Miss Joan, sex=female), PersonImpl(age=2.0, home=Cornwall / Akron, OH, name=Wells, Master Ralph Lester, sex=male), PersonImpl(age=36.0, home=Bournmouth, England, name=West, Mr Edwy Arthur, sex=male), PersonImpl(age=33.0, home=Bournmouth, England, name=West, Mrs Edwy Arthur (Ada Mary), sex=female), PersonImpl(age=32.0, home=London, England, name=Wilhelms, Mr Charles, sex=male), PersonImpl(age=26.0, home=Yoevil, England / Cottage Grove, OR, name=Wright, Miss Marion, sex=female), PersonImpl(age=30.0, home=Bryn Mawr, PA, USA, name=Aldworth, Mr Charles Augustus, sex=male), PersonImpl(age=24.0, home=London / Montreal, PQ, name=Brown, Miss Mildred, sex=female), PersonImpl(age=18.0, home=, name=Swane, Mr George, sex=male), PersonImpl(age=42.0, home=, name=Abbing, Mr Anthony, sex=male), PersonImpl(age=13.0, home=East Providence, RI, name=Abbott, Master Eugene Joseph, sex=male), PersonImpl(age=16.0, home=East Providence, RI, name=Abbott, Mr Rossmore Edward, sex=male), PersonImpl(age=35.0, home=East Providence, RI, name=Abbott, Mrs Stanton (Rosa), sex=female), PersonImpl(age=16.0, home=Norway Los Angeles, CA, name=Abelseth, Miss Anna Karen, sex=female), PersonImpl(age=25.0, home=Perkins County, SD, name=Abelseth, Mr Olaus, sex=male), PersonImpl(age=18.0, home=Greensburg, PA, name=Abraham, Mrs Joseph (Sophie Easu), sex=female), PersonImpl(age=20.0, home=Taalintehdas, Finland Hoboken, NJ, name=Abrahamsson, Mr August, sex=male), PersonImpl(age=30.0, home=Asarum, Sweden Brooklyn, NY, name=Adahl, Mr Mauritz Nils Martin, sex=male), PersonImpl(age=26.0, home=Bournemouth, England, name=Adams, Mr John, sex=male), PersonImpl(age=40.0, home=Sweden Akeley, MN, name=Ahlin, Mrs Johanna Persdotter, sex=female), PersonImpl(age=24.0, home=, name=Ahmed, Mr Ali, sex=male), PersonImpl(age=41.0, home=Finland Sudbury, ON, name=Aijo-Nirva, Mr Isak, sex=male), PersonImpl(age=18.0, home=London, England Norfolk, VA, name=Aks, Mrs Sam (Leah Rosen), sex=female), PersonImpl(age=0.8333, home=London, England Norfolk, VA, name=Aks, Master Philip, sex=male), PersonImpl(age=23.0, home=England Albion, NY, name=Alexander, Mr William, sex=male), PersonImpl(age=20.0, home=Salo, Finland Astoria, OR, name=Alhomaki, Mr Ilmari Rudolf, sex=male), PersonImpl(age=25.0, home=Argentina, name=Ali, Mr William, sex=male), PersonImpl(age=35.0, home=Lower Clapton, Middlesex or Erdington, Birmingham, name=Allen, Mr William Henry, sex=male), PersonImpl(age=17.0, home=Windsor, England New York, NY, name=Allum, Mr Owen George, sex=male), PersonImpl(age=32.0, home=Bergen, Norway, name=Andersen, Mr Albert Karvin, sex=male), PersonImpl(age=20.0, home=Oslo, Norway Cameron, WI, name=Andersen, Mr Thor Olsvigen, sex=male), PersonImpl(age=39.0, home=Sweden Winnipeg, MN, name=Andersson, Mr Anders Johan, sex=male), PersonImpl(age=39.0, home=Sweden Winnipeg, MN, name=Andersson, Mrs Anders Johan (Alfrida K. Brogren), sex=female), PersonImpl(age=6.0, home=Sweden Winnipeg, MN, name=Andersson, Miss Ebba Iris, sex=female), PersonImpl(age=2.0, home=Sweden Winnipeg, MN, name=Andersson, Miss Ellis Anna Maria, sex=female), PersonImpl(age=17.0, home=Ruotsinphyhtaa, Finland New York, NY, name=Andersson, Miss Erna, sex=female), PersonImpl(age=38.0, home=Vadsbro, Sweden Ministee, MI, name=Andersson, Miss Ida Augusta Margareta, sex=female), PersonImpl(age=9.0, home=Sweden Winnipeg, MN, name=Andersson, Miss Ingeborg Constancia, sex=female), PersonImpl(age=26.0, home=Hartford, CT, name=Andersson, Mr Johan Samuel, sex=male), PersonImpl(age=11.0, home=Sweden Winnipeg, MN, name=Andersson, Miss Sigrid Elizabeth, sex=female), PersonImpl(age=4.0, home=Sweden Winnipeg, MN, name=Andersson, Master Sigvard Harald Elias, sex=male), PersonImpl(age=20.0, home=Sweden Chicago, IL, name=Andreasson, Mr Paul Edvin, sex=male), PersonImpl(age=26.0, home=Bulgaria Chicago, IL, name=Angheloff, Mr Minko, sex=male), PersonImpl(age=25.0, home=Altdorf, Switzerland, name=Arnold, Mr Josef, sex=male), PersonImpl(age=18.0, home=Altdorf, Switzerland, name=Arnold, Mrs Josef (Josephine Frank), sex=female), PersonImpl(age=24.0, home=Sweden Joliet, IL, name=Aronsson, Mr Ernst Axel Algot, sex=male), PersonImpl(age=35.0, home=, name=Asim, Mr Adola, sex=male), PersonImpl(age=40.0, home=Sweden  Worcester, MA, name=Asplund, Mr Carl Oscar Vilhelm Gustafsson, sex=male), PersonImpl(age=38.0, home=Sweden  Worcester, MA, name=Asplund, Mrs Carl Oscar (Selma Augusta Johansson), sex=female), PersonImpl(age=5.0, home=Sweden  Worcester, MA, name=Asplund, Master Carl Edgar, sex=male), PersonImpl(age=9.0, home=Sweden Worcester, MA, name=Asplund, Master Clarence Gustaf Hugo, sex=male), PersonImpl(age=3.0, home=Sweden Worcester, MA, name=Aspland, Master Edvin Rojj Felix, sex=male), PersonImpl(age=13.0, home=Sweden Worcester, MA, name=Asplund, Master Filip Oscar, sex=male), PersonImpl(age=23.0, home=Oskarshamn, Sweden Minneapolis, MN, name=Asplund, Mr John Charles, sex=male), PersonImpl(age=5.0, home=Sweden Worcester, MA, name=Asplund, Miss Lillian Gertrud, sex=female), PersonImpl(age=45.0, home=Ottawa, ON, name=Assaf, Mrs Mariana, sex=female), PersonImpl(age=23.0, home=, name=Assam, Mr Ali, sex=male), PersonImpl(age=17.0, home=, name=Attalah, Miss Malaka, sex=female), PersonImpl(age=27.0, home=Ottawa, ON, name=Attala (Kalil), Mr Solomon, sex=male), PersonImpl(age=23.0, home=Krakoryd, Sweden Bloomington, IL, name=Augustsson, Mr Albert, sex=male), PersonImpl(age=20.0, home=, name=Baccos, Mr Rafoul, sex=male), PersonImpl(age=32.0, home=Ruotsinphytaa, Finland New York, NY, name=Backstrom, Mr Karl Alfred, sex=male), PersonImpl(age=33.0, home=Ruotsinphytaa, Finland New York, NY, name=Backstrom, Mrs Karl Alfred (Maria Mathilda Gustafsson), sex=female), PersonImpl(age=3.0, home=Syria New York, NY, name=Baclini, Miss Eugenie, sex=female), PersonImpl(age=18.0, home=London Skanteales, NY, name=Badman, Miss Emily Louisa, sex=female), PersonImpl(age=40.0, home=, name=Badt, Mr Mohamed, sex=male), PersonImpl(age=26.0, home=, name=Balkic, Mr Cerin, sex=male), PersonImpl(age=15.0, home=Syria Youngstown, OH, name=Banoura, Miss Ayout, sex=female), PersonImpl(age=45.0, home=Syria Ottawa, ON, name=Barbara, Mrs Catherine, sex=female), PersonImpl(age=18.0, home=Syria Ottawa, ON, name=Barbara, Miss Saude, sex=female), PersonImpl(age=27.0, home=New York, NY, name=Barry, Miss Julia, sex=female), PersonImpl(age=22.0, home=England New York, NY, name=Barton Mr David, sex=male), PersonImpl(age=19.0, home=England, name=Beavan, Mr William Thomas, sex=male), PersonImpl(age=26.0, home=Krakudden, Sweden Moune, IL, name=Bengtsson, Mr John Viktor, sex=male), PersonImpl(age=22.0, home=Tranvik, Finland New York, name=Berglund. Mr Karl Ivar Sven, sex=male), PersonImpl(age=20.0, home=Syria, name=Betros, Mr Tannous, sex=male), PersonImpl(age=32.0, home=Hong Kong New York, NY, name=Bing, Mr Lee, sex=male), PersonImpl(age=21.0, home=Brennes, Norway New York, name=Birkeland, Mr Hans, sex=male), PersonImpl(age=18.0, home=Stockholm, Sweden New York, name=Bjorklund, Ernst Herbert, sex=male), PersonImpl(age=26.0, home=Bulgaria Chicago, IL, name=Bostandyeff, Mr Guentcho, sex=male), PersonImpl(age=6.0, home=Syria Kent, ON, name=Boulos, Master Akar, sex=male), PersonImpl(age=9.0, home=Syria Kent, ON, name=Boulos, Miss Laura, sex=female), PersonImpl(age=40.0, home=Ireland Chicago, IL, name=Bourke, Mr John, sex=male), PersonImpl(age=32.0, home=Ireland Chicago, IL, name=Bourke, Mrs John (Catherine), sex=female), PersonImpl(age=26.0, home=Treherbert, Cardiff, Wales, name=Bowen, Mr David, sex=male), PersonImpl(age=18.0, home=Kingwilliamstown, Co Cork, Ireland Glens Falls, NY, name=Bradley, Miss Bridget Delia, sex=female), PersonImpl(age=20.0, home=Medeltorp, Sweden Chicago, IL, name=Braf, Miss Elin Ester Maria, sex=female), PersonImpl(age=29.0, home=Bridgerule, Devon, name=Braund, Mr Lewis Richard, sex=male), PersonImpl(age=22.0, home=Bridgerule, Devon, name=Braund, Mr Owen Harris, sex=male), PersonImpl(age=22.0, home=Sweden Worcester, MA, name=Brobek, Mr Karl Rudolf, sex=male), PersonImpl(age=35.0, home=Broomfield, Chelmsford, England, name=Brocklebank, Mr William Alfred, sex=male), PersonImpl(age=21.0, home=Kingwilliamstown, Co Cork, Ireland New York, NY, name=Buckley, Mr Daniel, sex=male), PersonImpl(age=20.0, home=Co Cork, Ireland Roxbury, MA, name=Buckley, Miss Katherine, sex=female), PersonImpl(age=19.0, home=Co Cork, Ireland Charlestown, MA, name=Burke, Mr Jeremiah, sex=male), PersonImpl(age=18.0, home=Co Sligo, Ireland New York, NY, name=Burns, Miss Mary Delia, sex=female), PersonImpl(age=18.0, home=Croatia, name=Cacic, Mr Grego, sex=male), PersonImpl(age=38.0, home=Croatia, name=Cacic, Mr Luka, sex=male), PersonImpl(age=30.0, home=Croatia, name=Cacic, Mr Maria, sex=male), PersonImpl(age=17.0, home=, name=Calic, Mr Peter, sex=male), PersonImpl(age=21.0, home=, name=Canavan, Miss Mary, sex=female), PersonImpl(age=21.0, home=Ireland Philadelphia, PA, name=Canavan, Mr Patrick, sex=male), PersonImpl(age=21.0, home=, name=Cann, Mr Ernest, sex=male), PersonImpl(age=24.0, home=Goteborg, Sweden Huntley, IL, name=Carlsson, Mr Carl Robert, sex=male), PersonImpl(age=33.0, home=New York, NY, name=Carlsson, Mr Frans Olof, sex=male), PersonImpl(age=33.0, home=, name=Carlsson, Mr Julius, sex=male), PersonImpl(age=28.0, home=Dagsas, Sweden Fower, MN, name=Carlsson, Mr August Sigfrid, sex=male), PersonImpl(age=16.0, home=Co Longford, Ireland New York, NY, name=Carr, Miss Helen, sex=female), PersonImpl(age=37.0, home=Co Sligo, Ireland Hartford, CT, name=Carr, Miss Jeannie, sex=female), PersonImpl(age=28.0, home=St Denys, Southampton, Hants, name=Carver, Mr Alfred John, sex=male), PersonImpl(age=24.0, home=London, name=Celotti, Mr Francesco, sex=male), PersonImpl(age=21.0, home=Ireland New York, NY, name=Chartens, Mr David, sex=male), PersonImpl(age=32.0, home=Hong Kong New York, NY, name=Chip, Mr Chang, sex=male), PersonImpl(age=29.0, home=, name=Christmann, Mr Emil, sex=male), PersonImpl(age=26.0, home=Greece, name=Chronopoulos, Mr Apostolos, sex=male), PersonImpl(age=18.0, home=Greece, name=Chronopoulos, Mr Demetrios, sex=male), PersonImpl(age=20.0, home=Portugal, name=Coelho, Mr Domingos Fernandes, sex=male), PersonImpl(age=19.0, home=London Brooklyn, NY, name=Cohen, Mr Gurshon (Gus), sex=male), PersonImpl(age=24.0, home=Co Limerick, Ireland Sherbrooke, PQ, name=Colbert, Mr Patrick, sex=male), PersonImpl(age=24.0, home=, name=Coleff, Mr Fotio, sex=male), PersonImpl(age=36.0, home=Bulgaria Chicago, IL, name=Coleff, Mr Peyo, sex=male), PersonImpl(age=31.0, home=Philadelphia, PA, name=Conlin, Mr Thomas Henry, sex=male), PersonImpl(age=31.0, home=Ireland Brooklyn, NY, name=Connaghton, Mr Michael, sex=male), PersonImpl(age=30.0, home=Ireland, name=Connolly, Miss Kate, sex=female), PersonImpl(age=22.0, home=Ireland, name=Connolly, Miss Kate, sex=female), PersonImpl(age=43.0, home=, name=Cook, Mr Jacob, sex=male), PersonImpl(age=35.0, home=Austria, name=Cor, Mr Bartol, sex=male), PersonImpl(age=27.0, home=Austria, name=Cor, Mr Ivan, sex=male), PersonImpl(age=19.0, home=Austria, name=Cor, Mr Ludovik, sex=male), PersonImpl(age=30.0, home=London, name=Corn, Mr Harry, sex=male), PersonImpl(age=36.0, home=England Brooklyn, NY, name=Coutts, Mrs William (Minnie), sex=female), PersonImpl(age=3.0, home=England Brooklyn, NY, name=Coutts, Master Neville, sex=male), PersonImpl(age=9.0, home=England Brooklyn, NY, name=Coutts, Master William Leslie, sex=male), PersonImpl(age=59.0, home=Merrill, WI, name=Coxon, Mr Daniel, sex=male), PersonImpl(age=19.0, home=Bristol, England Cleveland, OH, name=Crease, Mr Ernest James, sex=male), PersonImpl(age=44.0, home=Bournemouth, England Newark, NJ, name=Cribb, Mr John Hatfield, sex=male), PersonImpl(age=17.0, home=Bournemouth, England Newark, NJ, name=Cribb, Miss Laura Alice, sex=female), PersonImpl(age=45.0, home=Australia Fingal, ND, name=Dahl, Mr Charles Edward, sex=male), PersonImpl(age=22.0, home=Norrlot, Sweden Chicago, IL, name=Dahlberg, Miss Gerda Ulrika, sex=female), PersonImpl(age=19.0, home=Austria, name=Dakic, Mr Branko, sex=male), PersonImpl(age=29.0, home=Co Athlone, Ireland New York, NY, name=Daly, Mr Eugene, sex=male), PersonImpl(age=30.0, home=Co Athlone, Ireland New York, NY, name=Daly, Miss Marcella, sex=female), PersonImpl(age=34.0, home=Stanton, IA, name=Danbom, Mr Ernst Gilbert, sex=male), PersonImpl(age=28.0, home=Stanton, IA, name=Danbom, Mrs Ernst Gilbert (Anna Sigrid Maria Brogren), sex=female), PersonImpl(age=0.3333, home=Stanton, IA, name=Danbom, Master Gilbert Sigvard Emanuel, sex=male), PersonImpl(age=27.0, home=Bulgaria Chicago, IL, name=Danoff, Mr Yoto, sex=male), PersonImpl(age=25.0, home=Bulgaria Chicago, IL, name=Dantchoff, Mr Khristo, sex=male), PersonImpl(age=24.0, home=West Bromwich, England Pontiac, MI, name=Davies, Mr Alfred, sex=male), PersonImpl(age=22.0, home=, name=Davies, Mr Evan, sex=male), PersonImpl(age=21.0, home=West Bromwich, England Pontiac, MI, name=Davies, Mr John, sex=male), PersonImpl(age=17.0, home=West Bromwich, England Pontiac, MI, name=Davies, Mr Joseph, sex=male), PersonImpl(age=26.0, home=Devon, England Wichita, KS, name=Dean, Mr Bertram, sex=male), PersonImpl(age=33.0, home=Devon, England Wichita, KS, name=Dean, Mrs Bertram (Eva), sex=female), PersonImpl(age=1.0, home=Devon, England Wichita, KS, name=Dean, Master Bertram Vere, sex=male), PersonImpl(age=0.1667, home=Devon, England Wichita, KS, name=Dean, Miss Elizabeth Gladys (Millvena), sex=female), PersonImpl(age=25.0, home=, name=Delalic, Mr Regyo, sex=male), PersonImpl(age=36.0, home=Tampico, MT, name=De Messemaeker, Mr William Joseph, sex=male), PersonImpl(age=36.0, home=Tampico, MT, name=De Messemaeker, Mrs William Joseph (Anna), sex=female), PersonImpl(age=30.0, home=Belgium Detroit, MI, name=De Mulder, Mr Theo, sex=male), PersonImpl(age=23.0, home=, name=Dennis, Mr Samuel, sex=male), PersonImpl(age=26.0, home=, name=Dennis, Mr William, sex=male), PersonImpl(age=19.0, home=Kilmacowen, Co Sligo, Ireland New York, NY, name=Devaney, Miss Margaret, sex=female), PersonImpl(age=65.0, home=, name=Dewan, Mr Frank, sex=male), PersonImpl(age=42.0, home=, name=Dimic, Mr Jovan, sex=male), PersonImpl(age=43.0, home=, name=Dintcheff, Mr Valtcho, sex=male), PersonImpl(age=32.0, home=Ireland New York, NY, name=Dooley, Mr Patrick, sex=male), PersonImpl(age=19.0, home=England Oglesby, IL, name=Dorkings, Mr Edward Arthur, sex=male), PersonImpl(age=30.0, home=Union Hill, NJ, name=Dowdell, Miss Elizabeth, sex=female), PersonImpl(age=24.0, home=Ireland New York, NY, name=Doyle, Miss Elizabeth, sex=female), PersonImpl(age=23.0, home=London New York, NY, name=Drapkin, Miss Jennie, sex=female), PersonImpl(age=24.0, home=Ballydehob, Co Cork, Ireland New York, NY, name=Driscoll, Miss Bridget, sex=female), PersonImpl(age=24.0, home=England Albion, NY, name=Duquemin, Mr Joseph, sex=male), PersonImpl(age=23.0, home=West Haven, CT, name=Dyker, Mr Adolf Fredrik, sex=male), PersonImpl(age=22.0, home=West Haven, CT, name=Dyker, Mrs Adolf Fredrik (Anna Elizabeth Judith Andersson), sex=female), PersonImpl(age=18.0, home=Tofta, Sweden Joliet, IL, name=Edvardsson, Mr Gustaf Hjalmar, sex=male), PersonImpl(age=16.0, home=Karberg, Sweden Jerome Junction, AZ, name=Eklund, Mr Hans Linus, sex=male), PersonImpl(age=45.0, home=Effington Rut, SD, name=Ekstrom, Mr Johan, sex=male), PersonImpl(age=47.0, home=Illinois, USA, name=Elsbury, Mr James, sex=male), PersonImpl(age=5.0, home=New York, NY, name=Emanuel, Miss Virginia Ethel, sex=female), PersonImpl(age=21.0, home=Rotherfield, Sussex, England Essex Co, MA, name=Ford, Miss Doolina Margaret, sex=female), PersonImpl(age=18.0, home=Rotherfield, Sussex, England Essex Co, MA, name=Ford, Mr Edward Watson, sex=male), PersonImpl(age=9.0, home=Rotherfield, Sussex, England Essex Co, MA, name=Ford, Miss Maggie, sex=female), PersonImpl(age=48.0, home=Rotherfield, Sussex, England Essex Co, MA, name=Ford, Mrs Edward (Margaret Ann), sex=female), PersonImpl(age=16.0, home=Rotherfield, Sussex, England Essex Co, MA, name=Ford, Mr Neil Watson, sex=male), PersonImpl(age=25.0, home=New York, NY, name=Gallagher, Mr Martin, sex=male), PersonImpl(age=22.0, home=, name=Gilinski, Mr Leslie, sex=male), PersonImpl(age=16.0, home=Co Longford, Ireland New York, NY, name=Gilnagh, Miss Katie, sex=female), PersonImpl(age=33.0, home=Strood, Kent, England Detroit, MI, name=Goldsmith, Mr Frank John, sex=male), PersonImpl(age=9.0, home=Strood, Kent, England Detroit, MI, name=Goldsmith, Master Frank John William, sex=male), PersonImpl(age=41.0, home=Philadelphia, PA, name=Goldsmith, Mr Nathan, sex=male), PersonImpl(age=38.0, home=Portugal, name=Goncalves, Mr Manuel Estanslas, sex=male), PersonImpl(age=40.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Mr Frederick, sex=male), PersonImpl(age=43.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Mrs Frederick (Augusta), sex=female), PersonImpl(age=14.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Mr Charles E., sex=male), PersonImpl(age=16.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Miss Lillian A., sex=female), PersonImpl(age=9.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Master Harold V., sex=male), PersonImpl(age=10.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Miss Jessie A., sex=female), PersonImpl(age=6.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Master Sidney L., sex=male), PersonImpl(age=11.0, home=Wiltshire, England Niagara Falls, NY, name=Goodwin, Master William F., sex=male), PersonImpl(age=40.0, home=Dorking, Surrey, England, name=Green, Mr George, sex=male), PersonImpl(age=32.0, home=Foresvik, Norway Portland, ND, name=Gronnestad, Mr Daniel Danielsen, sex=male), PersonImpl(age=20.0, home=Waukegan, Chicago, IL, name=Gustafsson, Mr Alfred Ossian, sex=male), PersonImpl(age=37.0, home=Ruotsinphytaa, Finland New York, NY, name=Gustafsson, Mr Anders Vilhelm, sex=male), PersonImpl(age=28.0, home=Ruotsinphytaa, Finland New York, NY, name=Gustafsson, Mr Johan Birger, sex=male), PersonImpl(age=19.0, home=Myren, Sweden New York, NY, name=Gustafsson, Mr Karl Gideon, sex=male)]"
      ]
     },
     "execution_count": 56,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "persons"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Column-based polymorphism"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 57,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// When data frame variable is mutable, a strongly typed wrapper for it \n",
    "// is generated only once after the first execution of a cell where it is declared\n",
    "var nameAndSex = df.select(df.name, df.sex)\n",
    "nameAndSex"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 58,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// let's declare immutable variable, that contains all string columns\n",
    "val strings = df.selectIf{valueClass == String::class}\n",
    "strings"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 59,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">pclass</th><th style=\"text-align:left\">name</th><th style=\"text-align:left\">embarked</th><th style=\"text-align:left\">home</th><th style=\"text-align:left\">room</th><th style=\"text-align:left\">ticket</th><th style=\"text-align:left\">boat</th><th style=\"text-align:left\">sex</th></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td><td style=\"text-align:left\" title=\"B-5\">B-5</td><td style=\"text-align:left\" title=\"24160 L221\">24160 L221</td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(135)\">(135)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C26\">C26</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td><td style=\"text-align:left\" title=\"C22\">C22</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"11\">11</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"E-12\">E-12</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"3\">3</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td><td style=\"text-align:left\" title=\"D-7\">D-7</td><td style=\"text-align:left\" title=\"13502 L77\">13502 L77</td><td style=\"text-align:left\" title=\"10\">10</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td><td style=\"text-align:left\" title=\"A-36\">A-36</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td><td style=\"text-align:left\" title=\"C-101\">C-101</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"2\">2</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"(22)\">(22)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"(124)\">(124)</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"17754 L224 10s 6d\">17754 L224 10s 6d</td><td style=\"text-align:left\" title=\"4\">4</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td><td style=\"text-align:left\" title=\"B-35\">B-35</td><td style=\"text-align:left\" title=\"17477 L69 6s\">17477 L69 6s</td><td style=\"text-align:left\" title=\"9\">9</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td><td style=\"text-align:left\" title=\"A-23\">A-23</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"B\">B</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"6\">6</td><td style=\"text-align:left\" title=\"female\">female</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td><td style=\"text-align:left\" title=\"B-58/60\">B-58/60</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"Cherbourg\">Cherbourg</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td><td style=\"text-align:left\" title=\"C-6\">C-6</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"male\">male</td></tr><tr><td style=\"text-align:left\" title=\"1st\">1st</td><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"Southampton\">Southampton</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td><td style=\"text-align:left\" title=\"D-35\">D-35</td><td style=\"text-align:left\" title=\"\"></td><td style=\"text-align:left\" title=\"5\">5</td><td style=\"text-align:left\" title=\"female\">female</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 59,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// 'nameAndSex' is assignable from 'strings', \n",
    "// because 'strings' has all the columns that are required by type of 'nameAndSex'\n",
    "nameAndSex = strings\n",
    "\n",
    "// note, that the actual value of 'nameAndSex' is still a data frame of all string columns\n",
    "nameAndSex"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "sex [Str][1313]: female, female, male, female, male, male, female, male, female, male, male, female,..."
      ]
     },
     "execution_count": 60,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// but typed access to the fields works only for 'name' and 'sex'\n",
    "nameAndSex.sex // this is OK"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Type mismatch: inferred type is TypedDataFrame<Line_181_jupyter.DataFrameType7> but TypedDataFrame<Line_194_jupyter.DataFrameType11> was expected"
     ]
    }
   ],
   "source": [
    "nameAndSex.home // this fails with compilation error"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "home [Str][1313]: St Louis, MO, Montreal, PQ / Chesterville, ON, Montreal, PQ / Chesterville, ON, Mo..."
      ]
     },
     "execution_count": 62,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "nameAndSex[\"home\"] // the requested column is still available by column name string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 63,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/html": [
       "<html><body><table><tr><th style=\"text-align:left\">name</th><th style=\"text-align:left\">home</th></tr><tr><td style=\"text-align:left\" title=\"Allen, Miss Elisabeth Walton\">Allen, Miss Elisabeth Walton</td><td style=\"text-align:left\" title=\"St Louis, MO\">St Louis, MO</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Miss Helen Loraine\">Allison, Miss Helen Loraine</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mr Hudson Joshua Creighton\">Allison, Mr Hudson Joshua Creighton</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)\">Allison, Mrs Hudson J.C. (Bessie Waldo Daniels)</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td></tr><tr><td style=\"text-align:left\" title=\"Allison, Master Hudson Trevor\">Allison, Master Hudson Trevor</td><td style=\"text-align:left\" title=\"Montreal, PQ / Chesterville, ON\">Montreal, PQ / Chesterville, ON</td></tr><tr><td style=\"text-align:left\" title=\"Anderson, Mr Harry\">Anderson, Mr Harry</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Miss Kornelia Theodosia\">Andrews, Miss Kornelia Theodosia</td><td style=\"text-align:left\" title=\"Hudson, NY\">Hudson, NY</td></tr><tr><td style=\"text-align:left\" title=\"Andrews, Mr Thomas, jr\">Andrews, Mr Thomas, jr</td><td style=\"text-align:left\" title=\"Belfast, NI\">Belfast, NI</td></tr><tr><td style=\"text-align:left\" title=\"Appleton, Mrs Edward Dale (Charlotte Lamson)\">Appleton, Mrs Edward Dale (Charlotte Lamson)</td><td style=\"text-align:left\" title=\"Bayside, Queens, NY\">Bayside, Queens, NY</td></tr><tr><td style=\"text-align:left\" title=\"Artagaveytia, Mr Ramon\">Artagaveytia, Mr Ramon</td><td style=\"text-align:left\" title=\"Montevideo, Uruguay\">Montevideo, Uruguay</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Colonel John Jacob\">Astor, Colonel John Jacob</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr><tr><td style=\"text-align:left\" title=\"Astor, Mrs John Jacob (Madeleine Talmadge Force)\">Astor, Mrs John Jacob (Madeleine Talmadge Force)</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr><tr><td style=\"text-align:left\" title=\"Aubert, Mrs Leontine Pauline\">Aubert, Mrs Leontine Pauline</td><td style=\"text-align:left\" title=\"Paris, France\">Paris, France</td></tr><tr><td style=\"text-align:left\" title=\"Barkworth, Mr Algernon H.\">Barkworth, Mr Algernon H.</td><td style=\"text-align:left\" title=\"Hessle, Yorks\">Hessle, Yorks</td></tr><tr><td style=\"text-align:left\" title=\"Baumann, Mr John D.\">Baumann, Mr John D.</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mrs James (Helene DeLaudeniere Chaput)\">Baxter, Mrs James (Helene DeLaudeniere Chaput)</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td></tr><tr><td style=\"text-align:left\" title=\"Baxter, Mr Quigg Edmond\">Baxter, Mr Quigg Edmond</td><td style=\"text-align:left\" title=\"Montreal, PQ\">Montreal, PQ</td></tr><tr><td style=\"text-align:left\" title=\"Beattie, Mr Thomson\">Beattie, Mr Thomson</td><td style=\"text-align:left\" title=\"Winnipeg, MN\">Winnipeg, MN</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mr Richard Leonard\">Beckwith, Mr Richard Leonard</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr><tr><td style=\"text-align:left\" title=\"Beckwith, Mrs Richard Leonard (Sallie Monypeny)\">Beckwith, Mrs Richard Leonard (Sallie Monypeny)</td><td style=\"text-align:left\" title=\"New York, NY\">New York, NY</td></tr></table><p>... only showing top 20 rows</p></body></html>"
      ]
     },
     "execution_count": 63,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "// now let's create a variable with two other columns\n",
    "val nameAndHome = df.select(df.name, df.home)\n",
    "nameAndHome"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 64,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "Type mismatch: inferred type is TypedDataFrame<Line_217_jupyter.DataFrameType12> but TypedDataFrame<Line_181_jupyter.DataFrameType7> was expected"
     ]
    }
   ],
   "source": [
    "nameAndSex = nameAndHome // this assignment doesn't work because of columns mismatch"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "metadata": {},
   "outputs": [],
   "source": [
    "// unfortunately, there is a way to get a runtime error here, \n",
    "// because typed wrappers are generated only after execution of a cell\n",
    "\n",
    "// so the following assigment will pass fine, because return type of 'select' is the same as in 'df' variable, \n",
    "// although the set of columns was reduced\n",
    "nameAndSex = df.select(df.name, df.home) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 66,
   "metadata": {},
   "outputs": [
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "java.util.NoSuchElementException: Could not find column 'sex' in dataframe\n",
      "krangl.SimpleDataFrame.get(SimpleDataFrame.kt:129)\n",
      "krangl.typed.TypedDataFrame$DefaultImpls.get(TypedDataFrame.kt:43)\n",
      "krangl.typed.TypedDataFrameImpl.get(TypedDataFrame.kt:73)\n",
      "Line_184_jupyter.getSex(Unknown Source)\n",
      "Line_227_jupyter.<init>(Unknown Source)\n",
      "java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)\n",
      "java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)\n",
      "java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)\n",
      "java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:488)\n",
      "kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.evalWithConfigAndOtherScriptsResults(BasicJvmScriptEvaluator.kt:95)\n",
      "kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.invoke$suspendImpl(BasicJvmScriptEvaluator.kt:40)\n",
      "kotlin.script.experimental.jvm.BasicJvmScriptEvaluator.invoke(BasicJvmScriptEvaluator.kt)\n",
      "kotlin.script.experimental.jvmhost.repl.JvmReplEvaluator$eval$$inlined$write$lambda$2.invokeSuspend(legacyReplEvaluation.kt:57)\n",
      "kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.DispatchedTask.run(Dispatched.kt:238)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.kt:116)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:80)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:54)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:36)\n",
      "org.jetbrains.kotlin.mainKts.relocatedDeps.kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)\n",
      "kotlin.script.experimental.jvmhost.repl.JvmReplEvaluator.eval(legacyReplEvaluation.kt:57)\n",
      "org.jetbrains.kotlin.cli.common.repl.ReplEvalAction$DefaultImpls.eval$default(ReplApi.kt:123)\n",
      "org.jetbrains.kotlin.jupyter.ReplForJupyterImpl.doEval(repl.kt:429)\n",
      "org.jetbrains.kotlin.jupyter.ReplForJupyterImpl.eval(repl.kt:349)\n",
      "org.jetbrains.kotlin.jupyter.ProtocolKt$shellMessagesHandler$res$1.invoke(protocol.kt:91)\n",
      "org.jetbrains.kotlin.jupyter.ProtocolKt$shellMessagesHandler$res$1.invoke(protocol.kt)\n",
      "org.jetbrains.kotlin.jupyter.ProtocolKt.evalWithIO(protocol.kt:252)\n",
      "org.jetbrains.kotlin.jupyter.ProtocolKt.shellMessagesHandler(protocol.kt:90)\n",
      "org.jetbrains.kotlin.jupyter.IkotlinKt.kernelServer(ikotlin.kt:104)\n",
      "org.jetbrains.kotlin.jupyter.IkotlinKt.main(ikotlin.kt:59)\n"
     ]
    }
   ],
   "source": [
    "// if we try to access the column, we get runtime error\n",
    "nameAndSex.sex "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## TODO"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Support operations:\n",
    "* Add row\n",
    "* Join\n",
    "* Reshape\n",
    "\n",
    "Improve typed wrappers for:\n",
    "* Grouped data frame\n",
    "* Columns"
   ]
  }
 ],
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