Solution/Day_06_Solution_v2.ipynb

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   "source": [
    "# [作業目標]\n",
    "\n",
    "1. [簡答題] 請問下列這三種方法有什麼不同？\n",
    "\n",
    "```\n",
    "print(a.sum()) \n",
    "print(np.sum(a))\n",
    "print(sum(a)) \n",
    "```\n",
    "\n",
    "2. 請對一個 5x5 的隨機矩陣作正規化的操作。\n",
    "\n",
    "3. 請建立一個長度等於 10 的正整數向量，並且將其中的最大值改成 -1。\n"
   ]
  },
  {
   "cell_type": "markdown",
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   },
   "source": [
    "# 作業 "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 1. [簡答題] 請問下列這三種方法有什麼不同？\n",
    "\n",
    "```\n",
    "print(a.sum()) \n",
    "print(np.sum(a))\n",
    "print(sum(a)) \n",
    "```\n",
    "\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "colab": {},
    "colab_type": "code",
    "id": "5QrYoyNWsvFS"
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "'\\nYour Code\\n'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
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   "source": [
    "sum() 是 python 內建的函式，所有型態皆可以用。np.sum(a) 跟 a.sum() 是陣列專有的函式，差別在於定義在 np 或是 array 底下。"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2. 請對一個 5x5 的隨機矩陣作正規化的操作。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "# 記得先 Import 正確的套件\n",
    "\n",
    "import numpy as np\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {
    "colab": {},
    "colab_type": "code",
    "id": "e1gVI0tvsvFY"
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   "outputs": [
    {
     "data": {
      "text/plain": [
       "array([[0.13197583, 0.1034873 , 0.        , 0.31390653, 0.35846645],\n",
       "       [0.14777047, 0.28417508, 0.75999011, 0.29030305, 0.72055306],\n",
       "       [0.98492508, 0.41249799, 1.        , 0.39756699, 0.39109584],\n",
       "       [0.85537752, 0.84696945, 0.69635415, 0.86720675, 0.61212718],\n",
       "       [0.24295928, 0.99120832, 0.09074347, 0.78251208, 0.57787873]])"
      ]
     },
     "execution_count": 7,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# 參考解答\n",
    "\n",
    "A = np.random.random((5, 5))\n",
    "\n",
    "A = (A - A.min()) / (A.max() - A.min())\n",
    "A"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 3. 請建立一個長度等於 10 的正整數向量，並且將其中的最大值改成 -1。\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[ 0.29347583  0.59303277 -1.          0.38043546  0.63265939  0.32472618\n",
      "  0.11340241  0.68136955  0.89905432  0.74769935]\n"
     ]
    }
   ],
   "source": [
    "Z = np.random.random(10)\n",
    "Z[Z.argmax()] = -1\n",
    "print (Z)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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