Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Log.java @ 4655:cd44d28d0fbc

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Move the access to artifact data to the Access object Use BedHeightAccess class to receive the data from the artifact. This abstracts the data access from the actual artifact.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 11 Dec 2012 09:44:04 +0100
parents 585c0b49e696
children
rev   line source
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
1 package de.intevation.flys.artifacts.math.fitting;
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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2
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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3 public class Log
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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4 extends Function
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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5 {
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6 public static final Derivative DERIVATIVE =
4dda67a893da FixA: Added the derivatives of all fitting functions.
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7 new Derivative("W'(Q) = m/(Q+b)") {
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8
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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9 @Override
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10 public de.intevation.flys.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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parents: 2569
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15
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parents: 2569
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16 return new de.intevation.flys.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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parents: 2569
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20 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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21 };
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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22 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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23 };
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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24
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25 public static final Function INSTANCE = new Log();
585c0b49e696 Added inverses of the fitting functions.
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26
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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27 public Log() {
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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28 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" });
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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29 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
30
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
31 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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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]);
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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34 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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35
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
36 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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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;
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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41 return new double [] {
3165
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42 Math.log(b_x),
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43 m/b_x
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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44 };
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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45 }
3009
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
diff changeset
46
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
diff changeset
47 @Override
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48 public Derivative getDerivative() {
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49 return DERIVATIVE;
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parents: 2569
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50 }
3177
585c0b49e696 Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3165
diff changeset
51
585c0b49e696 Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3165
diff changeset
52 @Override
585c0b49e696 Added inverses of the fitting functions.
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parents: 3165
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53 public Function getInverse() {
585c0b49e696 Added inverses of the fitting functions.
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54 return InvLog.INSTANCE;
585c0b49e696 Added inverses of the fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 3165
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55 }
2569
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
56 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org