annotate src/samer/units/EnergyOperator.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.units;
import  samer.core.*;
import  samer.maths.*;

public class EnergyOperator implements Filter
{
	double	u1=0, u2=0;	// previous two values

	public EnergyOperator()	{}

	public void dispose() {}

	public double filter( double u0)
	{
		double	y=u1*u1 - u0*u2; 
		u2=u1; 
		u1=u0;

		return y;
	}
}