Mercurial > dive4elements > river
comparison 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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2568:53e8bffbe06c | 2569:0dd58ab7e118 |
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1 package de.intevation.flys.artifacts.math.fitting; | |
2 | |
3 public class Log | |
4 extends Function | |
5 { | |
6 public Log() { | |
7 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" }); | |
8 } | |
9 | |
10 @Override | |
11 public double value(double x, double [] parameters) { | |
12 return parameters[0]*Math.log(x + parameters[1]); | |
13 } | |
14 | |
15 @Override | |
16 public double [] gradient(double x, double [] parameters) { | |
17 return new double [] { | |
18 Math.log(x + parameters[1]), | |
19 parameters[0]/(x + parameters[0]) | |
20 }; | |
21 } | |
22 } | |
23 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |