Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java @ 3177:585c0b49e696

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Added inverses of the fitting functions. flys-artifacts/trunk@4792 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Tue, 26 Jun 2012 06:33:37 +0000
parents 4dda67a893da
children 1c00ed73ccf4
rev   line source
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.artifacts.math.fitting;
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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2
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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3 public class Exp
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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4 extends Function
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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5 {
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6 public static final Derivative DERIVATIVE =
4dda67a893da FixA: Added the derivatives of all fitting functions.
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7 new Derivative("W'(Q) = a^Q*log(a)*m") {
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8
4dda67a893da FixA: Added the derivatives of all fitting functions.
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9 @Override
4dda67a893da FixA: Added the derivatives of all fitting functions.
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10 public de.intevation.flys.artifacts.math.Function
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11 instantiate(double [] parameters)
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12 {
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3009
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13 double m = parameters[0];
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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14 final double a = parameters[1];
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15 final double logam = Math.log(a)*m;
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16
4dda67a893da FixA: Added the derivatives of all fitting functions.
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17 return new de.intevation.flys.artifacts.math.Function() {
4dda67a893da FixA: Added the derivatives of all fitting functions.
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18 @Override
4dda67a893da FixA: Added the derivatives of all fitting functions.
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19 public double value(double Q) {
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20 return Math.pow(a, Q)*logam;
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parents: 2569
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21 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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22 };
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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23 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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24 };
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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25
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26 public static final Function INSTANCE = new Exp();
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27
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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28 public Exp() {
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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29 super(
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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30 "exp",
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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31 "W(Q) = m * a^Q + b",
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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32 new String [] { "m", "a", "b" });
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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33 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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34
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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35 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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36 public double value(double x, double [] parameters) {
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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37 return parameters[0]*Math.pow(parameters[1], x) + parameters[2];
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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38 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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39
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
40 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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41 public double [] gradient(double x, double [] parameters) {
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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42 return new double [] {
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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43 Math.pow(parameters[1], x),
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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44 Math.pow(parameters[1], x-1d)*x,
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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45 1d
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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46 };
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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47 }
3009
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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48
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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49 @Override
4dda67a893da FixA: Added the derivatives of all fitting functions.
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50 public Derivative getDerivative() {
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51 return DERIVATIVE;
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52 }
3177
585c0b49e696 Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3009
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53
585c0b49e696 Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3009
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54 @Override
585c0b49e696 Added inverses of the fitting functions.
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55 public Function getInverse() {
585c0b49e696 Added inverses of the fitting functions.
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parents: 3009
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56 return InvExp.INSTANCE;
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parents: 3009
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57 }
2569
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parents:
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58 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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59 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org