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

Initial Mercurial check in.

/*
 *	Abs.java	
 *
 *	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.*;

public class Abs extends Function
{	
	public double apply(double t) { return Math.abs(t); }
	public void apply(double [] x) {
		for (int i=0; i<x.length; i++) x[i]=Math.abs(x[i]);
	}
	public void apply(double [] x, double [] y) {
		for (int i=0; i<x.length; i++) y[i]=Math.abs(x[i]);
	}

	public Function derivative() { return new Sgn(); }
	public String format(String arg) { return "|"+arg+"|"; }
}