Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Pow.java @ 5831:bd047b71ab37

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Repaired internal references
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 12:06:39 +0200
parents flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Pow.java@59b14bc676ec
children
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
parents: 3178
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class Pow
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4 extends Function
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5 {
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6 public static final Derivative DERIVATIVE =
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7 new Derivative("W'(Q) = a*c*Q^(c-1)") {
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8
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9 @Override
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10 public org.dive4elements.river.artifacts.math.Function
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11 instantiate(double [] parameters)
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12 {
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13 final double a = parameters[0];
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14 final double c = parameters[1];
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15
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parents: 3178
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16 return new org.dive4elements.river.artifacts.math.Function() {
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17 @Override
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18 public double value(double Q) {
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19 return a*c*Math.pow(Q, c-1);
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20 }
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parents: 2569
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21 };
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parents: 2569
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22 }
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23 };
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24
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25 public static final Function INSTANCE = new Pow();
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26
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27 public Pow() {
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28 super(
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29 "pow",
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30 "W(Q) = a*Q^c + d",
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31 new String [] { "a", "c", "d" });
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32 }
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33
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34 @Override
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35 public double value(double x, double [] parameters) {
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36 return parameters[0]*Math.pow(x, parameters[1]) + parameters[2];
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parents:
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37 }
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parents:
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38
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parents:
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39 @Override
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40 public double [] gradient(double x, double [] parameters) {
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parents:
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41 double a = parameters[0];
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parents:
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42 double c = parameters[1];
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parents:
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43 double x_c = Math.pow(x, c);
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parents:
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44 return new double [] {
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45 x_c,
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46 a*x_c*Math.log(x),
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47 1d
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48 };
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49 }
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parents: 2569
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50
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parents: 2569
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51 @Override
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52 public Derivative getDerivative() {
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53 return DERIVATIVE;
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54 }
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55
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56 @Override
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57 public Function getInverse() {
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58 return InvPow.INSTANCE;
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59 }
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60 }
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61 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org