Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLog.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLog.java@bd047b71ab37
children 4897a58c8746
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
parents: 3259
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class InvLog
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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) = exp(W/m)/m") {
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8
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9 @Override
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bd047b71ab37 Repaired internal references
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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 _1m = 1d / parameters[0];
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14
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parents: 3259
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15 return new org.dive4elements.river.artifacts.math.Function() {
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16 @Override
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17 public double value(double W) {
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18 return Math.exp(W*_1m)*_1m;
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19 }
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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 InvLog();
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25
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26 public InvLog() {
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27 super("inv-log", "Q(W) = e^(W/m) - b", new String [] { "m", "b" });
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28 }
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29
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30 @Override
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31 public double value(double w, double [] parameters) {
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32 double m = parameters[0];
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33 double b = parameters[1];
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34 return Math.exp(w/m) - b;
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35 }
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36
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37 @Override
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38 public double [] gradient(double w, double [] parameters) {
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39 double m = parameters[0];
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40 double b = parameters[1];
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41 double ewm = Math.exp(w/m);
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42 return new double [] { -w*ewm/(m*m), -1 };
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43 }
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44
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45 @Override
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46 public Derivative getDerivative() {
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47 return DERIVATIVE;
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48 }
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49
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50 @Override
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51 public Function getInverse() {
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52 return Log.INSTANCE;
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53 }
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54 }
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55 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org