Normally distributed random numbers - Node.js Number

Node.js examples for Number:Random Number

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Description

Normally distributed random numbers

Demo Code


/* ---------------------------------------------------------------------------------------
This jsaSound Code is distributed under LGPL 3
Copyright (C) 2012 National University of Singapore
Inquiries: director@anclab.org/*  w  w w . j  a va  2s  .  co m*/

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or 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 GNULesser General Public License for more details.
You should have received a copy of the GNU General Public License and GNU Lesser General Public License along with this program.  If not, see <http://www.gnu.org/licenses/>
------------------------------------------------------------------------------------------*/
/*
Author: Lonce Wyse
Date: July 2012
*/

//-----------------------------------
//http://www.meredithdodge.com/2012/05/30/a-great-little-javascript-function-for-generating-random-gaussiannormalbell-curve-numbers/
// Normally distributed random numbers
Math.nrand = function(m, sd) {
  var x1, x2, rad, y1;
  do {
    x1 = 2 * this.random() - 1;
    x2 = 2 * this.random() - 1;
    rad = x1 * x1 + x2 * x2;
  } while(rad >= 1 || rad == 0);
  var c = this.sqrt(-2 * Math.log(rad) / rad);
  return (x1 * c)*sd +m;
};

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