Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.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> |
---|---|
date | Mon, 27 Feb 2012 14:16:30 +0000 |
parents | |
children | 4dda67a893da |
comparison
equal
deleted
inserted
replaced
2568:53e8bffbe06c | 2569:0dd58ab7e118 |
---|---|
1 package de.intevation.flys.artifacts.math.fitting; | |
2 | |
3 public class Exp | |
4 extends Function | |
5 { | |
6 public Exp() { | |
7 super( | |
8 "exp", | |
9 "W(Q) = m * a^Q + b", | |
10 new String [] { "m", "a", "b" }); | |
11 } | |
12 | |
13 @Override | |
14 public double value(double x, double [] parameters) { | |
15 return parameters[0]*Math.pow(parameters[1], x) + parameters[2]; | |
16 } | |
17 | |
18 @Override | |
19 public double [] gradient(double x, double [] parameters) { | |
20 return new double [] { | |
21 Math.pow(parameters[1], x), | |
22 Math.pow(parameters[1], x-1d)*x, | |
23 1d | |
24 }; | |
25 } | |
26 } | |
27 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |