Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Log.java @ 2569:0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
flys-artifacts/trunk@4095 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Mon, 27 Feb 2012 14:16:30 +0000 |
parents | |
children | 4dda67a893da |
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package de.intevation.flys.artifacts.math.fitting; public class Log extends Function { public Log() { super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" }); } @Override public double value(double x, double [] parameters) { return parameters[0]*Math.log(x + parameters[1]); } @Override public double [] gradient(double x, double [] parameters) { return new double [] { Math.log(x + parameters[1]), parameters[0]/(x + parameters[0]) }; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :