Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/LogLinear.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 6b13d7e7b403
children 59b14bc676ec
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".
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parents:
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2
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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3 public class LogLinear
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4 extends Function
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5 {
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6 public static final Derivative DERIVATIVE =
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7 new Derivative("W'(Q) = a*m/(m*Q + b)") {
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8
4dda67a893da FixA: Added the derivatives of all fitting functions.
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9 @Override
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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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13 final double a = parameters[0];
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14 final double m = parameters[1];
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15 final double b = parameters[2];
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16
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17 return new de.intevation.flys.artifacts.math.Function() {
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18 @Override
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19 public double value(double Q) {
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20 return a*m/(m*Q + b);
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21 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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22 };
4dda67a893da FixA: Added the derivatives of all fitting functions.
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23 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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24 };
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parents: 2569
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25
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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26 public LogLinear() {
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27 super(
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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28 "log-linear",
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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29 "W(Q) = a*ln(m*Q + b)",
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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30 new String [] { "a", "m", "b" });
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31 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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32
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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33 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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34 public double value(double x, double [] parameters) {
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35 return parameters[0]*Math.log(parameters[1]*x + parameters[2]);
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parents:
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36 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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37
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 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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39 public double [] gradient(double x, double [] parameters) {
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40 double a = parameters[0];
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41 double m = parameters[1];
6b13d7e7b403 FixA: Added more debug output.
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42 double b = parameters[2];
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43
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44 double lin = m*x + b;
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45
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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46 return new double [] {
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47 Math.log(lin),
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48 a*x / lin,
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49 a / lin
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50 };
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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51 }
3009
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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52
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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53 @Override
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54 public Derivative getDerivative() {
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55 return DERIVATIVE;
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56 }
3177
585c0b49e696 Added inverses of the fitting functions.
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57
585c0b49e696 Added inverses of the fitting functions.
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58 @Override
585c0b49e696 Added inverses of the fitting functions.
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59 public Function getInverse() {
585c0b49e696 Added inverses of the fitting functions.
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60 return InvLogLinear.INSTANCE;
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61 }
2569
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parents:
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62 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org