--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java	Tue Dec 15 15:14:21 2009 +0000
@@ -0,0 +1,30 @@
+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 };
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: