From e8162497fd9c4955186a54d1573c98cb321f1bb2 Mon Sep 17 00:00:00 2001
From: Alexey Berezin <beraliv.spb@gmail.com>
Date: Tue, 4 Sep 2018 00:51:15 +0300
Subject: [PATCH 1/3] refactror: add some improvements

* replace unused variable with `_`
* `throw` stops running the code in a function, so don't need to use `else` then
* `||`-operator is working wrong when falsy values go, so better replace them with `!=`-operator (as it's not strict and only `undefined` and `null` are usable there)
* better put conditions out of `for` loop to not evaluating the condition over and over for no need
* `+0.0` and `0.0` are exactly same values
* `[].slice` is shorter than `Array.prototype.slice`
* sometimes saving values to an arguments can take more time, it might be ambiguous
* `Math.max` and `Math.min` work longer than your own implementation
* `check` function can take `any` values now with `Number.isFinite`
*
---
 vector.js | 77 +++++++++++++++++++++++++++++++++----------------------
 1 file changed, 46 insertions(+), 31 deletions(-)

diff --git a/vector.js b/vector.js
index 2bc5445b..fe4cd5d7 100644
--- a/vector.js
+++ b/vector.js
@@ -124,7 +124,7 @@
    * @returns {Vector} this
    **/
   Vector.prototype.scale = function (scalar) {
-    return this.each(function(value, i, data){
+    return this.each(function(_, i, data) {
       data[i] *= scalar;
     });
   };
@@ -183,17 +183,24 @@
   Vector.fill = function (count, value, type) {
     if (count < 0)
       throw new Error('invalid size');
-    else if (count === 0)
+    if (count === 0)
       return new Vector();
-   
-    value = value || +0.0;
-    type = type || Float64Array;
+    
+    if (value == null) {
+      value = 0.0;
+    }
+    if (type == null) {
+      type = Float64Array;
+    }
     var data = new type(count),
-        isValueFn = typeof value === 'function',
         i;
 
-    for (i = 0; i < count; i++)
-      data[i] = isValueFn ? value(i) : value;
+    if (typeof value === 'function')
+      for (i = 0; i < count; i++)
+        data[i] = value(i);
+    else
+      for (i = 0; i < count; i++)
+        data[i] = value;
 
     return new Vector(data);
   };
@@ -207,7 +214,7 @@
    * @returns {Vector} a new vector of the specified size and `type`
    **/
   Vector.zeros = function (count, type) {
-    return Vector.fill(count, +0.0, type);
+    return Vector.fill(count, 0.0, type);
   };
 
   /**
@@ -234,8 +241,12 @@
    * @returns {Vector} a new vector of the specified size and `type`
    **/
   Vector.random = function (count, deviation, mean, type) {
-    deviation = deviation || 1;
-    mean = mean || 0;
+    if (deviation == null) {
+      deviation = 1;
+    }
+    if (mean == null) {
+      mean = 0;
+    }
     return Vector.fill(count, function() {
       return deviation * Math.random() + mean;
     }, type);
@@ -254,7 +265,7 @@
    * @returns {Vector} a new vector containing the specified range of the specified `type`
    **/
   Vector.range = function () {
-    var args = [].slice.call(arguments, 0),
+    var args = [].slice.call(arguments),
         backwards = false,
         start, step, end;
 
@@ -262,7 +273,7 @@
     if (typeof args[args.length - 1] === 'function')
       type = args.pop();
 
-    switch(args.length) {
+    switch (args.length) {
       case 2:
         end = args.pop();
         step = 1;
@@ -288,9 +299,14 @@
       throw new Error('invalid range');
 
     var data = new type(Math.ceil((end - start) / step)),
-        i, j;
-    for (i = start, j = 0; i < end; i += step, j++)
-      data[j] = backwards ? end - i + start : i;
+        i = start,
+        j = 0;
+    if (backwards)
+      for (; i < end; i += step, j++)
+        data[j] = end - i + start;
+    else
+      for (; i < end; i += step, j++)
+        data[j] = i;
 
     return new Vector(data);
   };
@@ -387,14 +403,10 @@
     if (this.length !== vector.length)
       return false;
 
-    var a = this.data,
-        b = vector.data,
-        length = this.length,
-        i = 0;
-
-    while (i < length && a[i] === b[i])
+    var i = 0;
+    while (i < this.length && this.data[i] === vector.data[i])
       i++;
-    return i === length;
+    return i === this.length;
   };
 
   /**
@@ -404,7 +416,7 @@
    **/
   Vector.prototype.min = function () {
     return this.reduce(function(acc, item) {
-      return Math.min(acc, item);
+      return acc < item ? acc : item;
     }, Number.POSITIVE_INFINITY);
   };
 
@@ -415,7 +427,7 @@
    **/
   Vector.prototype.max = function () {
     return this.reduce(function(acc, item) {
-      return Math.max(acc, item);
+      return acc < item ? item : acc;
     }, Number.NEGATIVE_INFINITY);
   };
 
@@ -425,7 +437,7 @@
    * @param {Number} index
    **/
   Vector.prototype.check = function (index) {  
-    if (Number.isNaN(index) || index < 0 || index > this.length - 1)
+    if (!Number.isFinite(index) || index < 0 || index > this.length - 1)
       throw new Error('index out of bounds');
   }
 
@@ -591,7 +603,7 @@
       throw new Error('Reduce of empty matrix with no initial value.');
 
     var i = 0,
-        value = initialValue || this.data[i++];
+        value = initialValue != null ? initialValue : this.data[i++];
 
     for (; i < l; i++)
       value = callback.call(this, value, this.data[i], i, this.data);
@@ -605,9 +617,12 @@
    **/
   Vector.prototype.toString = function () {
     var result = ['['],
-        i;
-    for (i = 0; i < this.length; i++)
-      result.push(i > 0 ? ', ' + this.data[i] : this.data[i]);
+        i = 0;
+    
+    if (i < this.length)
+      result.push(this.data[i++]);
+    while (i < this.length)
+      result.push(', ' + this.data[i++]);
     
     result.push(']');
 
@@ -623,7 +638,7 @@
     if (!this.data)
       return [];
 
-    return Array.prototype.slice.call(this.data);
+    return [].slice.call(this.data);
   };
 
   module.exports = Vector;

From f25b0a607d542e8bda48eb4dbe7a7275a221d7c7 Mon Sep 17 00:00:00 2001
From: Mateo Gianolio <gianoliomateo@gmail.com>
Date: Tue, 4 Sep 2018 23:31:09 +0200
Subject: [PATCH 2/3] update travis node version

---
 .travis.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index 0a7d4731..9b414df8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "4.0"
+  - "6.9.0"
 before_install:
   - sudo apt-get install libblas-dev
 env:

From 76b8e2c9dea59c7841a74e44aee31ceb0cf3aa0c Mon Sep 17 00:00:00 2001
From: Mateo Gianolio <gianoliomateo@gmail.com>
Date: Tue, 4 Sep 2018 23:38:17 +0200
Subject: [PATCH 3/3] bump version and generate new dist

---
 dist/vectorious.min.js | 2 +-
 package.json           | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/dist/vectorious.min.js b/dist/vectorious.min.js
index 674b2fe1..ddcc71ef 100644
--- a/dist/vectorious.min.js
+++ b/dist/vectorious.min.js
@@ -1 +1 @@
-!function i(a,s,h){function u(r,t){if(!s[r]){if(!a[r]){var e="function"==typeof require&&require;if(!t&&e)return e(r,!0);if(p)return p(r,!0);var n=new Error("Cannot find module '"+r+"'");throw n.code="MODULE_NOT_FOUND",n}var o=s[r]={exports:{}};a[r][0].call(o.exports,function(t){return u(a[r][1][t]||t)},o,o.exports,i,a,s,h)}return s[r].exports}for(var p="function"==typeof require&&require,t=0;t<h.length;t++)u(h[t]);return u}({1:[function(t,r,e){!function(){"use strict";var p=t("./vector");function c(t,r){return this.type=Float64Array,this.shape=[],t&&t.buffer&&t.buffer instanceof ArrayBuffer?c.fromTypedArray(t,r&&r.shape):t instanceof Array?c.fromArray(t):t instanceof p?c.fromVector(t,r&&r.shape):t instanceof c?c.fromMatrix(t):"number"==typeof t&&"number"==typeof r?c.fromShape([t,r]):t&&!t.buffer&&t.shape?c.fromShape(t.shape):void 0}c.fromTypedArray=function(t,r){if(t.length!==r[0]*r[1])throw new Error("Shape does not match typed array dimensions.");var e=Object.create(c.prototype);return e.shape=r,e.data=t,e.type=t.constructor,e},c.fromArray=function(t){var r,e,n=t.length,o=t[0].length,i=new Float64Array(n*o);for(r=0;r<n;++r)for(e=0;e<o;++e)i[r*o+e]=t[r][e];return c.fromTypedArray(i,[n,o])},c.fromMatrix=function(t){var r=Object.create(c.prototype);return r.shape=[t.shape[0],t.shape[1]],r.data=new t.type(t.data),r.type=t.type,r},c.fromVector=function(t,r){if(r&&t.length!==r[0]*r[1])throw new Error("Shape does not match vector dimensions.");var e=Object.create(c.prototype);return e.shape=r||[t.length,1],e.data=new t.type(t.data),e.type=t.type,e},c.fromShape=function(t){var r=t[0],e=t[1];return c.fromTypedArray(new Float64Array(r*e),t)},c.binOp=function(t,r,e){return new c(t).binOp(r,e)},c.prototype.binOp=function(t,r){var e,n=this.shape[0],o=this.shape[1],i=n*o,a=this.data,s=t.data;if(n!==t.shape[0]||o!==t.shape[1])throw new Error("sizes do not match!");for(e=0;e<i;e++)a[e]=r(a[e],s[e],e);return this},c.add=function(t,r){return new c(t).add(r)},c.prototype.add=function(t){return this.binOp(t,function(t,r){return t+r})},c.subtract=function(t,r){return new c(t).subtract(r)},c.prototype.subtract=function(t){return this.binOp(t,function(t,r){return t-r})},c.product=function(t,r){return new c(t).product(r)},c.prototype.product=function(t){return this.binOp(t,function(t,r){return t*r})},c.scale=function(t,r){return new c(t).scale(r)},c.prototype.scale=function(t){var r,e=this.shape[0]*this.shape[1],n=this.data;for(r=0;r<e;r++)n[r]*=t;return this},c.fill=function(t,r,e,n){if(t<=0||r<=0)throw new Error("invalid size");e=e||0;var o,i,a=new(n=n||Float64Array)(t*r),s="function"==typeof e,h=0;for(o=0;o<t;o++)for(i=0;i<r;i++,h++)a[h]=s?e(o,i):e;return c.fromTypedArray(a,[t,r])},c.zeros=function(t,r,e){return c.fill(t,r,0,e)},c.ones=function(t,r,e){return c.fill(t,r,1,e)},c.random=function(t,r,e,n,o){return e=e||1,n=n||0,c.fill(t,r,function(){return e*Math.random()+n},o)},c.multiply=function(t,r){return t.multiply(r)},c.prototype.multiply=function(t){var r=this.shape[0],e=this.shape[1],n=t.shape[0],o=t.shape[1],i=this.data,a=t.data;if(e!==n)throw new Error("sizes do not match");var s,h,u,p,f=new this.type(r*o);for(s=0;s<r;s++)for(h=0;h<o;h++){for(u=p=0;u<e;u++)p+=i[s*e+u]*a[h+u*o];f[s*o+h]=p}return c.fromTypedArray(f,[r,o])},Object.defineProperty(c.prototype,"T",{get:function(){return this.transpose()}}),c.prototype.transpose=function(){var t,r,e=this.shape[0],n=this.shape[1],o=new this.type(n*e);for(t=0;t<e;t++)for(r=0;r<n;r++)o[r*e+t]=this.data[t*n+r];return c.fromTypedArray(o,[n,e])},c.prototype.inverse=function(){var t=this.shape[0],r=this.shape[1];if(t!==r)throw new Error("invalid dimensions");var e,n,o=c.identity(t),i=c.augment(this,o).gauss(),a=c.zeros(t,r),s=c.zeros(t,r),h=i.shape[1];for(e=0;e<t;e++)for(n=0;n<h;n++)n<r?a.set(e,n,i.get(e,n)):s.set(e,n-t,i.get(e,n));if(!a.equals(c.identity(t)))throw new Error("matrix is not invertible");return s},c.prototype.gauss=function(){var t,r,e,n,o,i=this.shape[0],a=this.shape[1],s=new c(this),h=0;for(r=0;r<i;r++){if(a<=h)return new Error("matrix is singular");for(e=r;0===s.data[e*a+h];)if(i===++e&&(e=r,a===++h))return new Error("matrix is singular");if(s.swap(r,e),0!==(t=s.data[r*a+h]))for(n=0;n<a;n++)s.data[r*a+n]=s.data[r*a+n]/t;for(e=0;e<i;e++)if(o=s.data[e*a+h],e!==r)for(n=0;n<a;n++)s.data[e*a+n]=s.data[e*a+n]-s.data[r*a+n]*o;h++}for(r=0;r<i;r++){for(e=t=0;e<a;e++)t||(t=s.data[r*a+e]);if(t)for(n=0;n<a;n++)s.data[r*a+n]=s.data[r*a+n]/t}return s},c.prototype.lu=function(){var t,r,e=this.shape[0],n=this.shape[1],o=c.plu(this),i=o[1],a=(c.identity(e),new c(o[0])),s=new c(o[0]);for(t=0;t<e;t++)for(r=t;r<n;r++)a.data[t*n+r]=t===r?1:0;for(t=0;t<e;t++)for(r=0;r<t&&r<n;r++)s.data[t*n+r]=0;return[a,s,i]},c.plu=function(t){return new c(t).plu()},c.prototype.plu=function(){var t,r,e,n,o,i,a,s=this.data,h=this.shape[0],u=new Int32Array(h);for(a=0;a<h;++a){for(n=a,t=Math.abs(s[a*h+a]),i=a+1;i<h;++i)t<(r=Math.abs(s[i*h+a]))&&(t=r,n=i);for((u[a]=n)!==a&&this.swap(a,n),e=s[a*h+a],o=a+1;o<h;++o)s[o*h+a]/=e;for(o=a+1;o<h;++o){for(i=a+1;i<h-1;++i)s[o*h+i]-=s[o*h+a]*s[a*h+i],s[o*h+ ++i]-=s[o*h+a]*s[a*h+i];i===h-1&&(s[o*h+i]-=s[o*h+a]*s[a*h+i])}}return[this,u]},c.prototype.lusolve=function(t,r){var e,n,o,i=this.data,a=t.shape[0],s=t.shape[1],h=t.data;for(e=0;e<r.length;e++)e!==r[e]&&t.swap(e,r[e]);for(o=0;o<s;o++){for(e=0;e<a;e++)for(n=0;n<e;n++)h[e*s+o]-=i[e*a+n]*h[n*s+o];for(e=a-1;0<=e;e--){for(n=e+1;n<a;n++)h[e*s+o]-=i[e*a+n]*h[n*s+o];h[e*s+o]/=i[e*a+e]}}return t},c.prototype.solve=function(t){var r=c.plu(this),e=r[0],n=r[1];return e.lusolve(new c(t),n)},c.augment=function(t,r){return new c(t).augment(r)},c.prototype.augment=function(t){if(0===t.shape.length)return this;var r,e,n=this.shape[0],o=this.shape[1],i=t.shape[0],a=t.shape[1],s=this.data,h=t.data;if(n!==i)throw new Error("Rows do not match.");var u=o+a,p=new this.type(u*n);for(r=0;r<n;r++)for(e=0;e<o;e++)p[r*u+e]=s[r*o+e];for(r=0;r<i;r++)for(e=0;e<a;e++)p[r*u+e+o]=h[r*a+e];return this.shape=[n,u],this.data=p,this},c.identity=function(t,r){return c.fill(t,t,function(t,r){return t===r?1:0})},c.magic=function(t,r){if(t<0)throw new Error("invalid size");function e(t,r,e){return(r+2*e+1)%t}var n,o,i=new(r=r||Float64Array)(t*t);for(n=0;n<t;n++)for(o=0;o<t;o++)i[(t-n-1)*t+(t-o-1)]=e(t,t-o-1,n)*t+e(t,o,n)+1;return c.fromTypedArray(i,[t,t])},c.prototype.diag=function(){var t,r=this.shape[0],e=this.shape[1],n=new this.type(Math.min(r,e));for(t=0;t<r&&t<e;t++)n[t]=this.data[t*e+t];return new p(n)},c.prototype.determinant=function(){if(this.shape[0]!==this.shape[1])throw new Error("matrix is not square");var t,r=c.plu(this),e=r.pop(),n=r.pop(),o=this.shape[0],i=this.shape[1],a=1,s=1;for(t=0;t<o;t++)t!==e[t]&&(s*=-1);for(t=0;t<o;t++)a*=n.data[t*i+t];return s*a},c.prototype.trace=function(){var t,r,e=this.diag(),n=0;for(t=0,r=e.length;t<r;t++)n+=e.get(t);return n},c.equals=function(t,r){return t.equals(r)},c.prototype.equals=function(t){var r,e=this.shape[0],n=this.shape[1],o=e*n,i=this.data,a=t.data;if(e!==t.shape[0]||n!==t.shape[1]||this.type!==t.type)return!1;for(r=0;r<o;r++)if(i[r]!==a[r])return!1;return!0},c.prototype.check=function(t,r){if(Number.isNaN(t)||Number.isNaN(r)||t<0||r<0||t>this.shape[0]-1||r>this.shape[1]-1)throw new Error("index out of bounds")},c.prototype.get=function(t,r){return this.check(t,r),this.data[t*this.shape[1]+r]},c.prototype.set=function(t,r,e){return this.check(t,r),this.data[t*this.shape[1]+r]=e,this},c.prototype.swap=function(t,r){if(t<0||r<0||t>this.shape[0]-1||r>this.shape[0]-1)throw new Error("index out of bounds");var e=this.shape[1],n=this.data.slice(t*e,(t+1)*e);return this.data.copyWithin(t*e,r*e,(r+1)*e),this.data.set(n,r*e),this},c.prototype.map=function(t){var r,e=this.shape[0],n=this.shape[1],o=e*n,i=new c(this),a=i.data;for(r=0;r<o;r++)a[r]=t.call(i,a[r],r/n|0,r%n,a);return i},c.prototype.each=function(t){var r,e=this.shape[0],n=this.shape[1],o=e*n;for(r=0;r<o;r++)t.call(this,this.data[r],r/n|0,r%n);return this},c.prototype.reduce=function(t,r){var e=this.shape[0],n=this.shape[1],o=e*n;if(0===o&&!r)throw new Error("Reduce of empty matrix with no initial value.");for(var i=0,a=r||this.data[i++];i<o;i++)a=t.call(this,a,this.data[i],i/n|0,i%n);return a},c.prototype.rank=function(){var t,r,e,n,o,i,a=this.toArray().map(function(t){return new p(t)}),s=this.shape[0],h=this.shape[1],u=0;for(t=0;t<s-1;t++){for(n=null,r=t;r<s;r++)if(a[t].get(t)){t!==r&&(e=a[t],a[t]=a[r],a[r]=e),n=a[t];break}if(n)for(r=t+1;r<s;r++)i=(o=a[r]).get(t)/n.get(t),a[r]=o.subtract(n.scale(i))}for(t=0;t<s;t++)for(r=0;r<h;r++)if(a[t].get(r)){u++;break}return u},c.rank=function(t){return new c(t).rank()},c.prototype.toString=function(){var 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diff --git a/package.json b/package.json
index 6b5d5113..ae0eb69a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vectorious",
-  "version": "4.8.3",
+  "version": "4.8.4",
   "description": "A high performance linear algebra library.",
   "main": "vectorious.js",
   "scripts": {