view src/samer/maths/random/Laplacian.java @ 0:bf79fb79ee13

Initial Mercurial check in.

/*
 *	Copyright (c) 2000, Samer Abdallah, King's College London.
 *	All rights reserved.
 *
 *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
 *	without even the implied warranty of MERCHANTABILITY or 
 *	FITNESS FOR A PARTICULAR PURPOSE.
 */

package samer.maths.random;

public class Laplacian extends BaseRandom
{
	public double next()
	{ 
		double x;
		do { x=2*rnd.nextDouble()-1; } while (x==0.0);
		if (x>0) return -Math.log(x); 
		else     return Math.log(-x);
	}

	public String toString() { return "Laplacian"; }
}