xorshift - npm Package Compare versions

Comparing version 0.2.0 to 0.2.1

package.json

 {
   "name": "xorshift",
   "description": "Random number generator using xorshift128+",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "author": "Andreas Madsen <[e-mail]>",
@@ -6,0 +6,0 @@ "contributors": [

README.md

 #xorshift [![Build Status](https://travis-ci.org/AndreasMadsen/xorshift.svg?branch=master)](https://travis-ci.org/AndreasMadsen/xorshift)
 
-> Random number generator using xorshift128+
+> Pseudorandom number generator using [xorshift128+](http://xorshift.di.unimi.it/)
 
 ## Installation
 
-```sheel
-# npm install xorshift
+```bash
+npm install xorshift
 ```
@@ -27,3 +27,3 @@
 `xorshift.constructor`. In both cases random numbers can be generated using
-the two methods, `.random` and `.randomint`.
+the two methods `.random` and `.randomint`.
 
@@ -36,4 +36,4 @@ ```javascript
 
-This method returns a random 64bit double, with its value in the range [0, 1).
-That means 0 is inclusive and 1 is exclusive. This is completely similar to
+This method returns a random 64-bit double, with its value in the range [0, 1).
+That means 0 is inclusive and 1 is exclusive. This is equivalent to
 `Math.random()`.
@@ -58,8 +58,8 @@
 
-This method returns a random 64bit integer. Since JavaScript don't support
-64bit integers, the number is represented as an array with two elements in
+This method returns a random 64-bit integer. Since JavaScript doesn't support
+64-bit integers, the number is represented as an array with two elements in
 big-endian order.
 
 This method is useful if high precision is required, the `xorshift.random()`
-method won't allow you to get this precision since a 64bit IEEE754 double
+method won't allow you to get this precision since a 64-bit IEEE754 double
 only contains the 52 most significant bits.
@@ -75,4 +75,4 @@
 This method is used to construct a new random generator, with a specific seed.
-This can be useful when testing software where random numbers are involved and
-getting consistent results are important.
+This is useful when testing software where random numbers are involved and
+getting consistent results is important.
 
@@ -100,5 +100,5 @@ ```javascript
 
-This source also have a
+This source also has a
 [reference implementation](http://xorshift.di.unimi.it/xorshift128plus.c)
-for the xorshift128+ generator. A wrapper around this implementation have been
+for the xorshift128+ generator. A wrapper around this implementation has been
 created and is used for testing this module. To compile and run it:
@@ -111,4 +111,4 @@
 
-* `<numbers>` can be any number greater than zero, and it will be the amount
-if random numbers in the stdout. The default value is `10`.
+* `<numbers>` can be any number greater than zero, and it will be the number
+of random numbers written to `stdout`. The default value is `10`.
 * `<seed0>` and `<seed1>` forms the 128bit seed that the algorithm uses. Default
@@ -119,3 +119,3 @@ is `[1, 2]`.
 
-**The software is license under "MIT"**
+**This software is licensed under "MIT"**
 
@@ -122,0 +122,0 @@ > Copyright (c) 2014 Andreas Madsen & Emil Bay

reference.json

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+      "4.91894695349659238914e-01",
+      "5.31749976528186341085e-01",
+      "3.23883840283246016156e-01",
+      "9.02786701507148015011e-01",
+      "9.96321960759491753734e-01",
+      "3.40203053073609096302e-01",
+      "7.14479014949501722853e-01",
+      "2.66633830807262217633e-01",
+      "4.31877490522847296006e-01",
+      "3.50135347543390595959e-01",
+      "8.98337580636429322567e-01",
+      "6.05091345659094503873e-01",
+      "8.97254648214028005526e-01",
+      "1.57785241891019056837e-01",
+      "5.29840618714958466740e-02",
+      "9.37299901198460405638e-01",
+      "3.58565110320838487112e-01",
+      "2.53653971344025341850e-01",
+      "7.34322524649853258794e-01",
+      "2.16112819527439770084e-01",
+      "5.51778562971286135053e-01",
+      "6.24960406958222414175e-01",
+      "5.62329640809022812675e-03",
+      "4.99939389874158868210e-01",
+      "8.65201787144218137371e-01",
+      "8.15470629204076757901e-01",
+      "5.66918581685572631201e-01",
+      "1.91445186199821648643e-01",
+      "3.74852704186606988657e-01",
+      "8.12646785979468155858e-01",
+      "9.20790540819171443587e-01",
+      "4.36524691698111366733e-01",
+      "7.39790322595700100550e-01",
+      "7.95003771905751666083e-01",
+      "9.42807804840389174217e-01",
+      "1.45674751026505289175e-01",
+      "4.82338801322099719471e-02",
+      "2.72653897439588899232e-01",
+      "5.49480465912639548520e-02",
+      "9.78836278943074455938e-01",
+      "2.97123050693536283617e-01",
+      "1.02557381246966672350e-01",
+      "9.87785003462150479336e-01",
+      "1.77391431156944667791e-01",
+      "6.50725205222616898126e-01",
+      "5.43159845093348359057e-02",
+      "8.03773992368789436114e-01",
+      "2.51186750889210719251e-01",
+      "5.07241143442664244034e-01",
+      "6.87259860023494706383e-02",
+      "3.31224055510393355917e-01",
+      "2.59108064344895971942e-01",
+      "6.58227503152934323438e-01",
+      "3.63001789762791293725e-01"
+    ],
+    "3-4": [
+      "1.36424205265939235687e-12",
+      "4.54747350886464118958e-12",
+      "1.14440963450146426794e-05",
+      "2.67028855789330776815e-05",
+      "3.05231698571883924842e-05",
+      "4.34108193034798972576e-05",
+      "4.69165034870762109875e-02",
+      "1.09498514603068031192e-01",
+      "1.25333028587383488173e-01",
+      "1.31150680043011114151e-01",
+      "6.40428076879371976915e-01",
+      "1.46312902358583185602e-01",
+      "5.92077016642460929319e-01",
+      "1.14988412462126099456e-01",
+      "5.20095877207592982572e-01",
+      "6.25676451978478764815e-01",
+      "6.70612428638003743586e-01",
+      "5.34438496153006203926e-01",
+      "1.51369561551118581022e-01",
+      "6.60477997237447933543e-01",
+      "4.06590792241513510064e-01",
+      "7.97147106892100332232e-01",
+      "1.80529290483009807744e-01",
+      "4.73586007186805435509e-01",
+      "8.68066133905009307270e-01",
+      "3.24573522159534721965e-01",
+      "9.36208308361548002807e-01",
+      "6.93996466484514629158e-01",
+      "2.69562636343630979141e-01",
+      "2.57395456278582956955e-01",
+      "6.83711103648371398833e-01",
+      "5.91882261289520483771e-01",
+      "5.91924707907085956293e-01",
+      "7.27196122099359687496e-01",
+      "2.92674917010467439127e-01",
+      "3.41996180998844989674e-01",
+      "6.99324514537067232212e-01",
+      "3.17768672081573777533e-01",
+      "9.06059150466636875620e-01",
+      "4.51891459785473070809e-01",
+      "6.13251202045262289175e-01",
+      "1.04552895311181393012e-01",
+      "5.59636634718901238017e-01",
+      "2.08863870462449474630e-01",
+      "9.85876976529906468016e-01",
+      "6.11032859053935784033e-01",
+      "1.33085590633692296691e-01",
+      "6.42983219185190080225e-01",
+      "9.25570716310823993211e-01",
+      "3.33886744847653460511e-01",
+      "3.79876728226940407751e-01",
+      "2.70682986353592003326e-02",
+      "6.20346770845697781382e-01",
+      "9.86876634586054901632e-01",
+      "5.05158909588069970908e-01",
+      "2.81436650044464498066e-01",
+      "8.10303945988912754927e-02",
+      "3.23714278394013899032e-02",
+      "6.74036340750356011142e-01",
+      "8.60542159317257970841e-01",
+      "8.26933490794558911929e-01",
+      "4.98793526678823928577e-01",
+      "7.75484927475113883233e-01",
+      "1.73766170577742240511e-01",
+      "2.06792017792971405399e-01",
+      "2.60017631114273228832e-01",
+      "4.13564087123526658019e-01",
+      "1.26147492925016369014e-01",
+      "6.98904524885115341348e-01",
+      "6.73539731061082447283e-01",
+      "2.79628434956716853677e-01",
+      "3.31844968885238955636e-01",
+      "2.49140166071794899594e-01",
+      "5.85038996449405157563e-02",
+      "1.64295605653119736189e-03",
+      "6.61688391555940835786e-01",
+      "2.25656497910496467441e-01",
+      "5.46632983668384309084e-01",
+      "2.92839491432256293635e-01",
+      "4.10792248221932831953e-01",
+      "4.16202662888442320721e-01",
+      "6.43227792830983524652e-01",
+      "1.87159832050702190642e-01",
+      "2.35471579136372843877e-01",
+      "6.13434257495485413259e-01",
+      "6.21319201819875210902e-01",
+      "4.79932525302108059506e-01",
+      "6.32427807889365922733e-01",
+      "8.46730315308642733640e-01",
+      "1.82994808181582424567e-01",
+      "9.11896960112894783279e-01",
+      "8.32949026667121561474e-01",
+      "5.75336884747302379495e-01",
+      "6.15001941888442482664e-01",
+      "5.11498436403912792869e-01",
+      "7.33132547361477815429e-01",
+      "8.46052245800828384148e-01",
+      "6.96024230427652934594e-01",
+      "2.29461074712806745168e-01",
+      "6.80039733347726604862e-01"
+    ]
+  }
 }

test.js

@@ -17,8 +17,16 @@
 
+function floatview(d) {
+  // Makes sure that the exponent has two digets like in C-printf
+  var s = d.toExponential(20);
+  var m = s.match(/^([0-9.]+)e(\+|-)([0-9]+)$/);
+  var e = (m[3].length === 1) ? '0' + m[3] : m[3];
+  return m[1] + 'e' + m[2] + e;
+}
+
 test('random double', function (t) {
   t.test('with seed = [1, 2]', function (t) {
-    var ref = reference['1-2'];
+    var ref = reference.double['1-2'];
     var rng = xorshift.constructor([0, 1, 0, 2]);
     for (var i = 0; i < ref.length; i++) {
-      t.equal(rng.random(), parseInt(ref[i], 16) / Math.pow(2, 64));
+      t.equal(floatview(rng.random()), ref[i]);
     }
@@ -30,6 +38,6 @@
   t.test('with seed = [3, 4]', function (t) {
-    var ref = reference['3-4'];
+    var ref = reference.double['3-4'];
     var rng = xorshift.constructor([0, 3, 0, 4]);
     for (var i = 0; i < ref.length; i++) {
-      t.equal(rng.random(), parseInt(ref[i], 16) / Math.pow(2, 64));
+      t.equal(floatview(rng.random()), ref[i]);
     }
@@ -45,3 +53,3 @@
   t.test('with seed = [1, 2]', function (t) {
-    var ref = reference['1-2'];
+    var ref = reference.integer['1-2'];
     var rng = xorshift.constructor([0, 1, 0, 2]);
@@ -56,3 +64,3 @@ for (var i = 0; i < ref.length; i++) {
   t.test('with seed = [3, 4]', function (t) {
-    var ref = reference['3-4'];
+    var ref = reference.integer['3-4'];
     var rng = xorshift.constructor([0, 3, 0, 4]);
@@ -59,0 +67,0 @@ for (var i = 0; i < ref.length; i++) {

xorshift.js

@@ -95,10 +95,32 @@
  */
+var CONVERTION_BUFFER = new Buffer(8);
 XorShift.prototype.random = function() {
+  // :: t2 = randomint()
   var t2 = this.randomint();
+  var t2U = t2[0];
+  var t2L = t2[1];
 
-  // :: ret t2 / 2**64
-  return (t2[0] * 4294967296 + t2[1]) / 18446744073709551616;
+  // :: e = UINT64_C(0x3FF) << 52
+  var eU = 0x3FF << (52 - 32);
+  var eL = 0;
+
+  // :: s = t2 >> 12
+  var a1 = 12;
+  var m1 = 0xFFFFFFFF >>> (32 - a1);
+  sU = t2U >>> a1;
+  sL = (t2L >>> a1) | ((t2U & m1) << (32 - a1));
+
+  // :: x = e | s
+  var xU = eU | sU;
+  var xL = eL | sL;
+
+  // :: double d = *((double *)&x)
+  CONVERTION_BUFFER.writeUInt32BE(xU, 0, true);
+  CONVERTION_BUFFER.writeUInt32BE(xL, 4, true);
+  var d = CONVERTION_BUFFER.readDoubleBE(0, true);
+
+  // :: d - 1
+  return d - 1;
 };
 
-
 // There is nothing particularly scientific about this seed, it is just
@@ -105,0 +127,0 @@ // based on the clock.

Fixed alerts

Major refactor

Supply chain risk

Package has recently undergone a major refactor. It may be unstable or indicate significant internal changes. Use caution when updating to versions that include significant changes.

Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

26454

increased by47.43%

Lines of code

641

increased by54.09%

Number of medium supply chain risk alerts

0

decreased by-100%

Worsened metrics

Number of package files

10

decreased by-9.09%

No dependency changes