/*
* MFWithGradient.java
*
* Copyright (c) 2002-2015 Alexei Drummond, Andrew Rambaut and Marc Suchard
*
* This file is part of BEAST.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* BEAST is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* BEAST is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with BEAST; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package dr.math;
/**
* interface for a function of several variables with a gradient
*
* @version $Id: MFWithGradient.java,v 1.3 2005/05/24 20:26:01 rambaut Exp $
*
* @author Korbinian Strimmer
*/
public interface MFWithGradient extends MultivariateFunction
{
/**
* compute both function value and gradient at a point
*
* @param argument function argument (vector)
* @param gradient gradient (on return)
*
* @return function value
*/
double evaluate(double[] argument, double[] gradient);
/**
* compute gradient at a point
*
* @param argument function argument (vector)
* @param gradient gradient (on return)
*/
void computeGradient(double[] argument, double[] gradient);
}