Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Log.java @ 3962:d609fd83310a
merged flys-backend
author | Thomas Arendsen Hein <thomas@intevation.de> |
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date | Fri, 28 Sep 2012 12:15:04 +0200 |
parents | 585c0b49e696 |
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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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changeset
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1 package de.intevation.flys.artifacts.math.fitting; |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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2 |
0dd58ab7e118
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parents:
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3 public class Log |
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4 extends Function |
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parents:
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5 { |
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6 public static final Derivative DERIVATIVE = |
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7 new Derivative("W'(Q) = m/(Q+b)") { |
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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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13 final double m = parameters[0]; |
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14 final double b = parameters[1]; |
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parents:
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15 |
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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 m/(Q+b); |
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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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parents:
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23 }; |
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parents:
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24 |
3177
585c0b49e696
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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25 public static final Function INSTANCE = new Log(); |
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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
changeset
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27 public Log() { |
0dd58ab7e118
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parents:
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28 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" }); |
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parents:
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29 } |
0dd58ab7e118
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parents:
diff
changeset
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30 |
0dd58ab7e118
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parents:
diff
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31 @Override |
0dd58ab7e118
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parents:
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32 public double value(double x, double [] parameters) { |
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parents:
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33 return parameters[0]*Math.log(x + parameters[1]); |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
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34 } |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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35 |
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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36 @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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37 public double [] gradient(double x, double [] parameters) { |
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parents:
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38 double m = parameters[0]; |
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parents:
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39 double b = parameters[1]; |
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parents:
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40 double b_x = b + x; |
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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41 return new double [] { |
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parents:
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42 Math.log(b_x), |
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parents:
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43 m/b_x |
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parents:
diff
changeset
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44 }; |
0dd58ab7e118
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff
changeset
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45 } |
3009
4dda67a893da
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parents:
2569
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changeset
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46 |
4dda67a893da
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
2569
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changeset
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47 @Override |
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parents:
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48 public Derivative getDerivative() { |
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parents:
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49 return DERIVATIVE; |
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parents:
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50 } |
3177
585c0b49e696
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
3165
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51 |
585c0b49e696
Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
3165
diff
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52 @Override |
585c0b49e696
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parents:
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53 public Function getInverse() { |
585c0b49e696
Added inverses of the fitting functions.
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parents:
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54 return InvLog.INSTANCE; |
585c0b49e696
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
3165
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55 } |
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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56 } |
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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57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |