Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/LogLinear.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 LogLinear
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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*m/(m*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[0];
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22 final double m = parameters[1];
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23 final double b = parameters[2];
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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 a*m/(m*Q + b);
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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 LogLinear();
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35
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36 public LogLinear() {
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37 super(
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38 "log-linear",
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39 "W(Q) = a*ln(m*Q + b)",
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40 new String [] { "a", "m", "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 x, double [] parameters) {
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45 return parameters[0]*Math.log(parameters[1]*x + parameters[2]);
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46 }
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47
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48 @Override
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49 public double [] gradient(double x, double [] parameters) {
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50 double a = parameters[0];
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51 double m = parameters[1];
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52 double b = parameters[2];
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53
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54 double lin = m*x + b;
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55
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56 return new double [] {
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57 Math.log(lin),
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58 a*x / lin,
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59 a / lin
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60 };
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61 }
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62
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63 @Override
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64 public Derivative getDerivative() {
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65 return DERIVATIVE;
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66 }
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67
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68 @Override
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69 public Function getInverse() {
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70 return InvLogLinear.INSTANCE;
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71 }
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72 }
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73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org