samer@0: /*
samer@0:  *	Copyright (c) 2000, Samer Abdallah, King's College London.
samer@0:  *	All rights reserved.
samer@0:  *
samer@0:  *	This software is provided AS iS and WITHOUT ANY WARRANTY; 
samer@0:  *	without even the implied warranty of MERCHANTABILITY or 
samer@0:  *	FITNESS FOR A PARTICULAR PURPOSE.
samer@0:  */
samer@0: 
samer@0: package samer.maths.opt;
samer@0: import  samer.maths.*;
samer@0: 
samer@0: 
samer@0: public class AbsXFConvergence
samer@0: {
samer@0: 	double	XTOL=1e-7;	// various tolerances
samer@0: 	double  FTOL=XTOL*XTOL;
samer@0: 	
samer@0: 	public void setXTolerance( double tolx) { XTOL=tolx; }
samer@0: 	public void setFTolerance( double tolf) { FTOL=tolf; }
samer@0: 	
samer@0: 	public boolean isSatisfied(State S) 
samer@0: 	{
samer@0: 		// small step taken
samer@0: 		// this compares the actual step taken with
samer@0: 		if (Math.abs(S.P1.f-S.P2.f)>FTOL) return false;
samer@0: 		if (S.alpha*S.normh>XTOL) return false;
samer@0: 		return true;
samer@0: 	}
samer@0: }