Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLog.java @ 7167:2fd238b681a9
Add debug output triggered by debugging the last commit
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Thu, 26 Sep 2013 12:22:01 +0200 |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.math.fitting; |
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10 |
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11 public class InvLog |
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12 extends Function |
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13 { |
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14 public static final Derivative DERIVATIVE = |
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15 new Derivative("Q'(W) = exp(W/m)/m") { |
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16 |
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17 @Override |
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18 public org.dive4elements.river.artifacts.math.Function |
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19 instantiate(double [] parameters) |
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20 { |
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21 final double _1m = 1d / parameters[0]; |
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22 |
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23 return new org.dive4elements.river.artifacts.math.Function() { |
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24 @Override |
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25 public double value(double W) { |
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26 return Math.exp(W*_1m)*_1m; |
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27 } |
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28 }; |
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29 } |
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30 }; |
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31 |
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32 public static final Function INSTANCE = new InvLog(); |
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33 |
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34 public InvLog() { |
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35 super("inv-log", "Q(W) = e^(W/m) - b", new String [] { "m", "b" }); |
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36 } |
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37 |
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38 @Override |
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39 public double value(double w, double [] parameters) { |
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40 double m = parameters[0]; |
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41 double b = parameters[1]; |
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42 return Math.exp(w/m) - b; |
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43 } |
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44 |
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45 @Override |
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46 public double [] gradient(double w, double [] parameters) { |
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47 double m = parameters[0]; |
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48 double b = parameters[1]; |
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49 double ewm = Math.exp(w/m); |
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50 return new double [] { -w*ewm/(m*m), -1 }; |
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51 } |
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52 |
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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 } |
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57 |
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58 @Override |
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59 public Function getInverse() { |
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60 return Log.INSTANCE; |
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61 } |
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62 } |
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63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |