Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLogLinear.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/InvLogLinear.java@de67497de5a0
children
rev   line source
5831
bd047b71ab37 Repaired internal references
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class InvLogLinear
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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'(W) = e^(W/a)/(a*m)") {
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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 _1am = 1d/(parameters[0] * parameters[1]);
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15
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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 W) {
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19 return Math.exp(W*_1a)*_1am;
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20 }
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21 };
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22 }
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23 };
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24 public static final Function INSTANCE = new InvLogLinear();
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25
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26 public InvLogLinear() {
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27 super(
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28 "inv-log-linear",
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29 "Q(W)=(e^(W/a)-b)/m",
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30 new String [] { "a", "m", "b" });
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31 }
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32
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33 @Override
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34 public double value(double W, double [] parameters) {
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35 double a = parameters[0];
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36 double m = parameters[1];
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37 double b = parameters[2];
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38 return (Math.exp(W/a) - b)/m;
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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 W, double [] parameters) {
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43 double a = parameters[0];
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44 double m = parameters[1];
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45 double b = parameters[2];
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46 double eWa = Math.exp(W/a);
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47 return new double [] {
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48 -(W*eWa)/(a*a*m)
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49 -(eWa-b)/(m*m),
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50 -1/m
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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 LogLinear.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