sascha@357: package de.intevation.gnv.math;
sascha@357: 
sascha@357: import org.apache.commons.math.optimization.fitting.ParametricRealFunction;
sascha@357: 
sascha@357: import org.apache.commons.math.FunctionEvaluationException;
sascha@357: 
sascha@357: /**
sascha@357:  *  @author Sascha L. Teichmann
sascha@357:  */
sascha@357: public class LinearFunction
sascha@357: implements   ParametricRealFunction
sascha@357: {
sascha@357:     public static final LinearFunction INSTANCE = new LinearFunction();
sascha@357: 
sascha@357:     public LinearFunction() {
sascha@357:     }
sascha@357: 
sascha@357:     public double value(double x, double [] parameters)
sascha@357:     throws FunctionEvaluationException 
sascha@357:     {
sascha@357:         return x*parameters[0] + parameters[1];
sascha@357:     }
sascha@357: 
sascha@357:     public double [] gradient(double x, double [] parameters) 
sascha@357:     throws FunctionEvaluationException 
sascha@357:     {
sascha@357:         return new double [] { x, 1f };
sascha@357:     }
sascha@357: }
sascha@357: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: