view src/samer/functions/HalfSquare.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.functions;
import  samer.maths.*;

public class HalfSquare extends Function
{
	public double apply(double t) { return t*t/2; }
	public void apply(double [] x) {
		for (int i=0; i<x.length; i++) x[i]*=x[i]/2;
	}
	public void apply(double [] x, double [] y) {
		for (int i=0; i<x.length; i++) y[i]=x[i]*x[i]/2;
	}

	public String format(String arg) { return "sqr("+arg+")/2"; }
	public Function inverse() { return new ScaledFunction(new Sqrt(),Math.sqrt(2)); }
	public Function derivative() { return new Identity(); }
}