--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Linear.java	Thu Apr 25 15:23:37 2013 +0200
@@ -0,0 +1,50 @@
+package org.dive4elements.river.artifacts.math.fitting;
+
+public class Linear
+extends      Function
+{
+    public static final Derivative DERIVATIVE =
+        new Derivative("W'(Q) = m") {
+
+        @Override
+        public org.dive4elements.river.artifacts.math.Function
+            instantiate(double [] parameters)
+        {
+            final double m = parameters[0];
+
+            return new org.dive4elements.river.artifacts.math.Function() {
+                @Override
+                public double value(double Q) {
+                    return m;
+                }
+            };
+        }
+    };
+
+    public static final Function INSTANCE = new Linear();
+
+    public Linear() {
+        super("linear", "W(Q) = m*Q + b", new String [] { "m", "b" });
+    }
+
+    @Override
+    public double value(double x, double [] parameters) {
+        return x*parameters[0] + parameters[1];
+    }
+
+    @Override
+    public double [] gradient(double x, double [] parameters) {
+        return new double [] { x, 1d };
+    }
+
+    @Override
+    public Derivative getDerivative() {
+        return DERIVATIVE;
+    }
+
+    @Override
+    public Function getInverse() {
+        return InvLinear.INSTANCE;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :