Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Log.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/Log.java@bd047b71ab37
children 4897a58c8746
rev   line source
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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 Log
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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) = m/(Q+b)") {
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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 m = parameters[0];
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14 final double b = parameters[1];
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15
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parents: 3177
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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 m/(Q+b);
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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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parents: 2569
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23 };
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24
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25 public static final Function INSTANCE = new Log();
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26
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27 public Log() {
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28 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" });
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29 }
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parents:
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30
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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31 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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32 public double value(double x, double [] parameters) {
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33 return parameters[0]*Math.log(x + parameters[1]);
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34 }
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parents:
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35
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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36 @Override
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37 public double [] gradient(double x, double [] parameters) {
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38 double m = parameters[0];
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39 double b = parameters[1];
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40 double b_x = b + x;
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41 return new double [] {
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42 Math.log(b_x),
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43 m/b_x
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44 };
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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45 }
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parents: 2569
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46
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parents: 2569
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47 @Override
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48 public Derivative getDerivative() {
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49 return DERIVATIVE;
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50 }
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parents: 3165
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51
585c0b49e696 Added inverses of the fitting functions.
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parents: 3165
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52 @Override
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53 public Function getInverse() {
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54 return InvLog.INSTANCE;
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parents: 3165
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55 }
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parents:
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56 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org