Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Pow.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 Pow |
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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("W'(Q) = a*c*Q^(c-1)") { |
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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 a = parameters[0]; |
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22 final double c = parameters[1]; |
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23 |
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24 return new org.dive4elements.river.artifacts.math.Function() { |
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25 @Override |
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26 public double value(double Q) { |
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27 return a*c*Math.pow(Q, c-1); |
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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 |
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33 public static final Function INSTANCE = new Pow(); |
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34 |
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35 public Pow() { |
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36 super( |
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37 "pow", |
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38 "W(Q) = a*Q^c + d", |
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39 new String [] { "a", "c", "d" }); |
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40 } |
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41 |
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42 @Override |
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43 public double value(double x, double [] parameters) { |
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44 return parameters[0]*Math.pow(x, parameters[1]) + parameters[2]; |
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45 } |
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46 |
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47 @Override |
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48 public double [] gradient(double x, double [] parameters) { |
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49 double a = parameters[0]; |
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50 double c = parameters[1]; |
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51 double x_c = Math.pow(x, c); |
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52 return new double [] { |
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53 x_c, |
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54 a*x_c*Math.log(x), |
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55 1d |
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56 }; |
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57 } |
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58 |
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59 @Override |
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60 public Derivative getDerivative() { |
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61 return DERIVATIVE; |
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62 } |
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63 |
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64 @Override |
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65 public Function getInverse() { |
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66 return InvPow.INSTANCE; |
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67 } |
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68 } |
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69 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |