mt19937: a node.js Mersenne Twister 19937 generator

mt19937 is A Mersenne Twister pseudo-random generator of 32-bit numbers with a state size of 19937 bits.

See http://beam.acclab.helsinki.fi/~knordlun/mc/mt19937.c for detail implement information.

The following is the C source code declation:

/* A C-program for MT19937: Real number version / / genrand() generates one pseudorandom real number (double) / / which is uniformly distributed on [0,1]-interval, for each / / call. sgenrand(seed) set initial values to the working area / / of 624 words. Before genrand(), sgenrand(seed) must be / / called once. (seed is any 32-bit integer except for 0). / / Integer generator is obtained by modifying two lines. / / Coded by Takuji Nishimura, considering the suggestions by / / Topher Cooper and Marc Rieffel in July-Aug. 1997. */

/* This library is free software; you can redistribute it and/or / / modify it under the terms of the GNU Library General Public / / License as published by the Free Software Foundation; either / / version 2 of the License, or (at your option) any later / / version. / / This library is distributed in the hope that it will be useful, / / but WITHOUT ANY WARRANTY; without even the implied warranty of / / MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. / / See the GNU Library General Public License for more details. / / You should have received a copy of the GNU Library General / / Public License along with this library; if not, write to the / / Free Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA / / 02111-1307 USA */

/* Copyright (C) 1997 Makoto Matsumoto and Takuji Nishimura. / / Any feedback is very welcome. For any question, comments, / / see http://www.math.keio.ac.jp/matumoto/emt.html or email / / [email protected] */

Usage

Installing

npm install mt19937

About seed

The default seed is 4357, Call Srand() set the seed if you need before Fetch any Number.

Set Seed

var mt19937 = require('mt19937');

console.log(mt19937.Srand(4357));

Fetch a 32bit number

var mt19937 = require('mt19937');

console.log(mt19937.Rand());

Fetch a real number (double)

var mt19937 = require('mt19937');

console.log(mt19937.RandReal());

License

(The MIT License)

Copyright (c) 2013 Xiangyi Kong <[email protected]>

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.