Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java @ 4708:45d05402b2a6
Importer: Emit log message when a dry run was run.
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 19 Dec 2012 11:40:19 +0100 |
parents | 1c00ed73ccf4 |
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rev | line source |
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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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1 package de.intevation.flys.artifacts.math.fitting; |
0dd58ab7e118
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parents:
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2 |
0dd58ab7e118
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3 public class Exp |
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4 extends Function |
0dd58ab7e118
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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^Q*log(a)*m") { |
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8 |
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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 double m = parameters[0]; |
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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 |
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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 Math.pow(a, Q)*logam; |
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21 } |
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22 }; |
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23 } |
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24 }; |
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parents:
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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".
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parents:
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28 public Exp() { |
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parents:
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29 super( |
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parents:
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30 "exp", |
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31 "W(Q) = m * a^Q + b", |
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32 new String [] { "m", "a", "b" }); |
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parents:
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33 } |
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parents:
diff
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34 |
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parents:
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35 @Override |
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parents:
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36 public double value(double x, double [] parameters) { |
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37 return parameters[0]*Math.pow(parameters[1], x) + parameters[2]; |
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parents:
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38 } |
0dd58ab7e118
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parents:
diff
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39 |
0dd58ab7e118
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parents:
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40 @Override |
3201
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41 public double [] gradient(double Q, double [] parameters) { |
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42 double m = parameters[0]; |
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parents:
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43 double a = parameters[1]; |
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44 double b = parameters[2]; |
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parents:
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45 return new double [] { |
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46 Math.pow(a, Q), |
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47 Math.pow(a, Q-1d)*m*Q, |
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48 1d |
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49 }; |
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parents:
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50 } |
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parents:
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51 |
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52 @Override |
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53 public Derivative getDerivative() { |
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54 return DERIVATIVE; |
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55 } |
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parents:
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56 |
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parents:
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57 @Override |
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58 public Function getInverse() { |
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59 return InvExp.INSTANCE; |
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parents:
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60 } |
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Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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61 } |
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parents:
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62 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |