Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Pow.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>
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 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 :
http://dive4elements.wald.intevation.org