# HG changeset patch
# User Sascha L. Teichmann <sascha.teichmann@intevation.de>
# Date 1340815262 0
# Node ID 1c00ed73ccf4b70a31196370b8737b3cc3bfa5fa
# Parent  099f18a4e227bab7273dc948d90a6d88a6414125
FixA: Fixed da/dQ for exp function but the fitting still does not work.

flys-artifacts/trunk@4818 c6561f87-3c4e-4783-a992-168aeb5c3f6f

diff -r 099f18a4e227 -r 1c00ed73ccf4 flys-artifacts/ChangeLog
--- a/flys-artifacts/ChangeLog	Wed Jun 27 16:12:32 2012 +0000
+++ b/flys-artifacts/ChangeLog	Wed Jun 27 16:41:02 2012 +0000
@@ -1,3 +1,8 @@
+2012-06-27	Sascha L. Teichmann	<sascha.teichmann@intevation.de>
+
+	* src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java:
+	  Fixed da/dQ but the fitting still does not work for the function. :-/
+
 2012-06-27	Christian Lins <christian.lins@intevation.de>
 
 	* src/main/java/de/intevation/flys/exports/fixings/FixWQCurveGenerator.java:
diff -r 099f18a4e227 -r 1c00ed73ccf4 flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java
--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java	Wed Jun 27 16:12:32 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java	Wed Jun 27 16:41:02 2012 +0000
@@ -38,10 +38,13 @@
     }
 
     @Override
-    public double [] gradient(double x, double [] parameters) {
+    public double [] gradient(double Q, double [] parameters) {
+        double m = parameters[0];
+        double a = parameters[1];
+        double b = parameters[2];
         return new double [] {
-            Math.pow(parameters[1], x),
-            Math.pow(parameters[1], x-1d)*x,
+            Math.pow(a, Q),
+            Math.pow(a, Q-1d)*m*Q,
             1d
         };
     }