view gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java @ 371:bc00848f0350

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author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Thu, 17 Dec 2009 15:39:20 +0000
parents 25e4724aa504
children 828df3ddb758
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package de.intevation.gnv.math;

import org.apache.commons.math.optimization.fitting.ParametricRealFunction;

import org.apache.commons.math.FunctionEvaluationException;

/**
 *  @author Sascha L. Teichmann
 */
public class LinearFunction
implements   ParametricRealFunction
{
    public static final LinearFunction INSTANCE = new LinearFunction();

    public LinearFunction() {
    }

    public double value(double x, double [] parameters)
    throws FunctionEvaluationException 
    {
        return x*parameters[0] + parameters[1];
    }

    public double [] gradient(double x, double [] parameters) 
    throws FunctionEvaluationException 
    {
        return new double [] { x, 1f };
    }
}
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