view src/samer/functions/Scale.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.*;
import  samer.core.*;
import  samer.core.types.*;

public class Scale extends Function implements DoubleModel
{	
	private double	k;

	public Scale(  double k) { this.k=k; }

	public double get() { return k; }
	public void set(double kk) { k=kk; }
	
	public void dispose() {}

	public double apply(double t) { return k*t; }
	public void apply(double [] x) { 	for (int i=0; i<x.length; i++) x[i]*=k; }
	public void apply(double [] x, double [] y) {
		for (int i=0; i<y.length; i++) y[i]=k*x[i];
	}

	public String format(String arg) { return X.string(k)+"*"+arg; }

	public Function inverse() { return new Scale(1/k); }
	public Function derivative() {	return new Constant(k); }
}