Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvSQPow.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/InvSQPow.java@de67497de5a0
children
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class InvSQPow
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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("Q'(S) = (S/a)^(1/b)/(b*S)") {
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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 _1a = 1d/parameters[0];
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14 final double b = parameters[1];
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15 final double _1b = 1d/b;
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16
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17 return new org.dive4elements.river.artifacts.math.Function() {
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18 @Override
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19 public double value(double S) {
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20 return Math.pow(S*_1a, _1b)/(b*S);
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21 }
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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 InvSQPow();
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26
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27 public InvSQPow() {
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28 super(
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29 "inv-sq-pow",
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30 "Q(S) = Q=(S/a)^(1/b)",
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31 new String [] { "a", "b" });
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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 S, double [] parameters) {
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36 double a = parameters[0];
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37 double b = parameters[1];
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38 return Math.pow(S/a, 1d/b);
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39 }
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40
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41 @Override
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42 public double [] gradient(double S, double [] parameters) {
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43 double a = parameters[0];
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44 double b = parameters[1];
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45 double Sa = S/a;
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46 double _1b = 1d/b;
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47 double eSa1b = Math.pow(Sa, _1b);
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48 return new double [] {
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49 -eSa1b/(a*b),
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50 -(eSa1b*Math.log(Sa))/(b*b)
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51 };
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52 }
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53
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54 @Override
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55 public Derivative getDerivative() {
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56 return DERIVATIVE;
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57 }
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58
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59 @Override
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60 public Function getInverse() {
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61 return SQPow.INSTANCE;
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62 }
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63 }
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64 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org