view src/samer/functions/CauchyInfomax.java @ 0:bf79fb79ee13

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/*
 *	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.functions;
import  samer.maths.*;

/** cauchy distribution score function */
public class CauchyInfomax extends Function
{
	public final double apply(double t) { return 2*t/(1+t*t); }
	public final void   apply(double [] x) { apply(x,x); }
	public final void   apply(double [] x, double [] y) { 
		for (int i=0; i<x.length; i++) {
			double t=x[i];
			y[i]= 2*t/(1+t*t); 
		}
	}
	public String format(String t) { return "dlogcauchy("+t+")"; }
}