--- a/flys-artifacts/ChangeLog	Mon Feb 27 10:50:14 2012 +0000
+++ b/flys-artifacts/ChangeLog	Mon Feb 27 14:16:30 2012 +0000
@@ -1,3 +1,58 @@
+2012-02-27  Sascha L. Teichmann	<sascha.teichmann@intevation.de>
+
+	Added functions to be used for fitting in 
+	the "Fixierungsanalyse" and "Extremwertermittlung".
+
+	* src/main/java/de/intevation/flys/artifacts/math/fitting/Function.java: New.
+	  Abstract base class for functions to fit. Provides the name of the function,
+	  a short description, the names of the parameters and an initial parameter guess
+	  for the fit processe. Sub classes have to overwite the function evaluation and
+	  the partial derivative of the function in respect to the parameters.
+
+	  TODO: Add a meachnism for the inverse function (needed for AT export) and
+	  the first derivative (needed for the respective diagram).
+
+	* src/main/java/de/intevation/flys/artifacts/math/fitting/FunctionFactory.java:
+	  New. Factory to fetch a function by its name.
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java: New.
+	   exp: W(Q) = m * a^Q + b
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/Quad.java: New.
+	   quad: W(Q) = n*Q^2 + m*Q + b
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/Linear.java: New.
+	   linear: W(Q) = m*Q + b
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/LogLinear.java: New.
+	   log-linear: W(Q) = a*ln(m*Q + b)
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/Log.java: New
+	   log: W(Q) = m*ln(Q + b)
+
+	 * src/main/java/de/intevation/flys/artifacts/math/fitting/Pow.java: New.
+	   pow: W(Q) = a*Q^c + d
+
+	   !!! This power function is new in the pool of functions to be fit. !!!
+	   See my mail "Manuelle Punkte in der Fixierungsanalyse" 2011-10-27 for details.
+	   The function exp-new found in the old FLYS function pool is omitted 
+	   because it is worthless and was maybe never used.
+
+	* src/main/java/de/intevation/flys/artifacts/math/fitting/App.java: New.
+	  Small test driver to check if the fitting is working. The points to
+	  fit are read from stdin the function to fit is determined by the
+	  system property 'function'. Example usage:
+
+	    $ mvn -e \
+	    -Dfunction=linear \
+	    -Dexec.mainClass=de.intevation.flys.artifacts.math.fitting.App exec:java <<EOF
+	    357.390696917 7546.72096163
+	    61.4291036312 1334.54835721
+	    799.962128234 16836.7698076
+	    126.52761023 2703.69789985
+	    900.448553398 18955.0578748
+	    EOF
+
 2012-02-27	Felix Wolfsteller	<felix.wolfsteller@intevation.de>
 
 	* src/main/resources/messages_de.properties: