Java tutorial
//package com.java2s; /* Copyright 2008, CCTC - Computer Science and Technology Center IBB-DEB - Institute for Biotechnology and Bioengineering - Department of Biological Engineering University of Minho This is free software: you can redistribute it and/or modify it under the terms of the GNU Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This code 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 Public License for more details. You should have received a copy of the GNU Public License along with this code. If not, see <http://www.gnu.org/licenses/>. Created inside the SysBio Research Group (http://sysbio.di.uminho.pt) University of Minho */ public class Main { static int iset = 0; static double gset; public static double normal(double u, double s) // Random normal distribution with mean u and standard deviation s { double fac, rsq, v1, v2; if (iset == 0) { do { v1 = 2.0 * Math.random() - 1.0; v2 = 2.0 * Math.random() - 1.0; rsq = v1 * v1 + v2 * v2; } while (rsq >= 1.0 || rsq == 0.0); fac = Math.sqrt(-2.0 * Math.log(rsq) / rsq); gset = v1 * fac; iset = 1; return (u + s * (v2 * fac)); } else { iset = 0; return (u + s * gset); } } }