Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Pow.java @ 3246:229e9b27ce15
New Distance helper module.
flys-artifacts/trunk@4879 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 06 Jul 2012 09:34:51 +0000 |
parents | 59b14bc676ec |
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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
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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2 |
0dd58ab7e118
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parents:
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3 public class Pow |
0dd58ab7e118
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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*c*Q^(c-1)") { |
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8 |
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parents:
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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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parents:
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13 final double a = parameters[0]; |
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14 final double c = parameters[1]; |
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parents:
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15 |
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parents:
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16 return new de.intevation.flys.artifacts.math.Function() { |
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17 @Override |
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18 public double value(double Q) { |
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19 return a*c*Math.pow(Q, c-1); |
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parents:
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20 } |
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parents:
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21 }; |
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parents:
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22 } |
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23 }; |
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parents:
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24 |
3178
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Fitting: Link the functions to there inverses via getInverse().
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25 public static final Function INSTANCE = new Pow(); |
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parents:
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26 |
2569
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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27 public Pow() { |
0dd58ab7e118
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parents:
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28 super( |
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parents:
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29 "pow", |
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parents:
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30 "W(Q) = a*Q^c + d", |
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31 new String [] { "a", "c", "d" }); |
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parents:
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32 } |
0dd58ab7e118
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parents:
diff
changeset
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33 |
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
diff
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34 @Override |
0dd58ab7e118
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parents:
diff
changeset
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35 public double value(double x, double [] parameters) { |
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parents:
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36 return parameters[0]*Math.pow(x, parameters[1]) + parameters[2]; |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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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:
diff
changeset
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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:
diff
changeset
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39 @Override |
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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40 public double [] gradient(double x, double [] parameters) { |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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41 double a = parameters[0]; |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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42 double c = parameters[1]; |
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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43 double x_c = Math.pow(x, c); |
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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44 return new double [] { |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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45 x_c, |
0dd58ab7e118
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parents:
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46 a*x_c*Math.log(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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47 1d |
0dd58ab7e118
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parents:
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48 }; |
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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49 } |
3009
4dda67a893da
FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2569
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changeset
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50 |
4dda67a893da
FixA: Added the derivatives of all fitting functions.
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parents:
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51 @Override |
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parents:
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52 public Derivative getDerivative() { |
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parents:
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53 return DERIVATIVE; |
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parents:
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54 } |
3177
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Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
3009
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55 |
585c0b49e696
Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
3009
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56 @Override |
585c0b49e696
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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57 public Function getInverse() { |
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Added inverses of the fitting functions.
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58 return InvPow.INSTANCE; |
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Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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59 } |
2569
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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60 } |
0dd58ab7e118
Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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61 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |