Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvPow.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
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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 InvPow
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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) = ((W-d)/a)^(1/c)/(c*(W-d))") {
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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 double a = parameters[0];
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22 final double c = parameters[1];
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23 final double d = parameters[2];
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24 final double _1a = 1d/a;
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25 final double _1c = 1d/c;
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26
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27 return new org.dive4elements.river.artifacts.math.Function() {
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28 @Override
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29 public double value(double W) {
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30 double Wd = W-d;
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31 return Math.pow(Wd*_1a, _1c)/(c*Wd);
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32 }
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33 };
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34 }
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35 };
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36
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37 public static final Function INSTANCE = new InvPow();
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38
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39 public InvPow() {
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40 super(
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41 "pow",
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42 "Q(W) = ((W-d)/a)^(1/c)",
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43 new String [] { "a", "c", "d" });
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44 }
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45
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46 @Override
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47 public double value(double W, double [] parameters) {
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48 double a = parameters[0];
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49 double c = parameters[1];
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50 double d = parameters[2];
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51 return Math.pow((W-d)/a, 1d/c);
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52 }
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53
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54 @Override
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55 public double [] gradient(double W, double [] parameters) {
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56 double a = parameters[0];
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57 double c = parameters[1];
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58 double d = parameters[2];
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59 double _1c = 1d/c;
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60 double Wdac = Math.pow((W-d)/a, 1d/c);
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61 double Wd = W-d;
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62 return new double [] {
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63 -Wdac/(a*c),
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64 (Wdac*Math.log(Wd/a))/(c*c),
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65 -Wdac/(c*Wd)
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66 };
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67 }
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68
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69 @Override
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70 public Derivative getDerivative() {
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71 // TODO: Implement me!
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72 return null;
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73 }
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74
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75 @Override
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76 public Function getInverse() {
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77 return Pow.INSTANCE;
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78 }
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79 }
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80 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org