--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/LogLinear.java	Mon Dec 02 14:07:25 2019 +0100
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/LogLinear.java	Mon Dec 02 14:14:06 2019 +0100
@@ -8,66 +8,12 @@
 
 package org.dive4elements.river.artifacts.math.fitting;
 
-public class LogLinear
-extends      Function
-{
-    public static final Derivative DERIVATIVE =
-        new Derivative("W'(Q) = a*m/(m*Q + b)") {
+public class LogLinear extends AbstractLogLinear {
 
-        @Override
-        public org.dive4elements.river.artifacts.math.Function
-            instantiate(double [] parameters)
-        {
-            final double a = parameters[0];
-            final double m = parameters[1];
-            final double b = parameters[2];
-
-            return new org.dive4elements.river.artifacts.math.Function() {
-                @Override
-                public double value(double Q) {
-                    return a*m/(m*Q + b);
-                }
-            };
-        }
-    };
 
     public static final Function INSTANCE = new LogLinear();
 
     public LogLinear() {
-        super(
-            "log-linear",
-            "W(Q) = a*ln(m*Q + b)",
-            new String [] { "a", "m", "b" });
-    }
-
-    @Override
-    public double value(double x, double [] parameters) {
-        return parameters[0]*Math.log(parameters[1]*x + parameters[2]);
+        super("log-linear", "W(Q) = a*ln(m*Q + b)");
     }
-
-    @Override
-    public double [] gradient(double x, double [] parameters) {
-        double a = parameters[0];
-        double m = parameters[1];
-        double b = parameters[2];
-
-        double lin = m*x + b;
-
-        return new double [] {
-            Math.log(lin),
-            a*x / lin,
-            a / lin
-        };
-    }
-
-    @Override
-    public Derivative getDerivative() {
-        return DERIVATIVE;
-    }
-
-    @Override
-    public Function getInverse() {
-        return InvLogLinear.INSTANCE;
-    }
-}
-// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
+}
\ No newline at end of file