Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvExp.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
5863
4897a58c8746 River artifacts: Added new copyright headers.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 5838
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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 InvExp
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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) = 1/(log(a)*(Q-b))") {
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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[1];
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22 final double b = parameters[2];
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23 final double loga = Math.log(a);
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24
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25 return new org.dive4elements.river.artifacts.math.Function() {
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26 @Override
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27 public double value(double Q) {
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28 return 1d/(loga*(Q-a));
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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
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34 public static final Function INSTANCE = new InvExp();
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35
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36 public InvExp() {
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37 super(
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38 "inv-exp",
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39 "Q(W) = log((W-b)/m)/log(a)",
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40 new String [] { "m", "a", "b" });
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41 }
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42
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43 @Override
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44 public double value(double W, double [] parameters) {
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45 double m = parameters[0];
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46 double a = parameters[1];
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47 double b = parameters[2];
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48 return Math.log((W-b)/m)/Math.log(a);
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49 }
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50
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51 @Override
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52 public double [] gradient(double Q, double [] parameters) {
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53 double m = parameters[0];
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54 double a = parameters[1];
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55 double b = parameters[2];
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56 double loga = Math.log(a);
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57 return new double [] {
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58 -1d/(loga*m),
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59 -Math.log((Q-b)/m)/(a*loga*loga),
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60 -1d/(loga*(Q-b))
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61 };
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62 }
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63
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64 @Override
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65 public Derivative getDerivative() {
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66 return DERIVATIVE;
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67 }
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68
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69 @Override
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70 public Function getInverse() {
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71 return Exp.INSTANCE;
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72 }
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73 }
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74 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org