Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/LogLinear.java @ 3395:2a8919e0ed28
Cosmetics, doc.
flys-artifacts/trunk@5025 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 17 Jul 2012 18:40:25 +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
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parents:
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2 |
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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 |
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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 } |
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22 }; |
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23 } |
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24 }; |
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25 |
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26 public static final Function INSTANCE = new LogLinear(); |
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27 |
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28 public LogLinear() { |
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29 super( |
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30 "log-linear", |
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31 "W(Q) = a*ln(m*Q + b)", |
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32 new String [] { "a", "m", "b" }); |
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33 } |
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34 |
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35 @Override |
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36 public double value(double x, double [] parameters) { |
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37 return parameters[0]*Math.log(parameters[1]*x + parameters[2]); |
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parents:
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38 } |
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parents:
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39 |
0dd58ab7e118
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parents:
diff
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40 @Override |
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41 public double [] gradient(double x, double [] parameters) { |
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42 double a = parameters[0]; |
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43 double m = parameters[1]; |
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44 double b = parameters[2]; |
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45 |
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46 double lin = m*x + b; |
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47 |
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48 return new double [] { |
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49 Math.log(lin), |
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50 a*x / lin, |
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51 a / lin |
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52 }; |
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parents:
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53 } |
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54 |
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55 @Override |
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56 public Derivative getDerivative() { |
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57 return DERIVATIVE; |
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58 } |
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59 |
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60 @Override |
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61 public Function getInverse() { |
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62 return InvLogLinear.INSTANCE; |
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63 } |
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64 } |
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parents:
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65 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |