Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/Fitting.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/model/sq/Fitting.java@aaf810d4ec82
children
rev   line source
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1 package org.dive4elements.river.artifacts.model.sq;
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2
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3 import org.dive4elements.river.artifacts.math.fitting.Function;
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4
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5 import java.util.ArrayList;
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6 import java.util.List;
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7
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8 import org.apache.commons.math.MathException;
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9
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10 import org.apache.commons.math.optimization.fitting.CurveFitter;
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11
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12 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer;
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13
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14 import org.apache.log4j.Logger;
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15
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16 public class Fitting
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17 implements Outlier.Callback
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18 {
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19 private static Logger log = Logger.getLogger(Fitting.class);
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20
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21 public interface Callback {
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22
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23 void afterIteration(
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24 double [] parameters,
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25 SQ [] measurements,
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26 SQ [] outliers,
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27 double standardDeviation,
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28 double chiSqr);
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29 } // interfacte
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30
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31 protected Function function;
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32
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33 protected double [] coeffs;
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34
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35 protected org.dive4elements.river.artifacts.math.Function instance;
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36
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37 protected double stdDevFactor;
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38 protected double chiSqr;
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39
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40 protected Callback callback;
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41
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42 public Fitting() {
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43 }
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44
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45 public Fitting(Function function, double stdDevFactor) {
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46 this();
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47 this.function = function;
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48 this.stdDevFactor = stdDevFactor;
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49 }
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50
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51 public Function getFunction() {
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52 return function;
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53 }
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54
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55 public void setFunction(Function function) {
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56 this.function = function;
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57 }
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58
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59 public double getStdDevFactor() {
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60 return stdDevFactor;
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61 }
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62
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63 public void setStdDevFactor(double stdDevFactor) {
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64 this.stdDevFactor = stdDevFactor;
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65 }
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66
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67 @Override
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68 public void initialize(List<SQ> sqs) throws MathException {
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69
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70 LevenbergMarquardtOptimizer lmo =
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71 new LevenbergMarquardtOptimizer();
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72
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73 CurveFitter cf = new CurveFitter(lmo);
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74 for (SQ sq: sqs) {
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75 cf.addObservedPoint(sq.getQ(), sq.getS());
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76 }
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77
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78 coeffs = cf.fit(
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79 function, function.getInitialGuess());
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80
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81 instance = function.instantiate(coeffs);
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82
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83 chiSqr = lmo.getChiSquare();
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84 }
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85
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86 @Override
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87 public double eval(SQ sq) {
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88 double s = instance.value(sq.q);
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89 return sq.s - s;
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90 }
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91
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92 @Override
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93 public void iterationFinished(
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94 double standardDeviation,
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95 SQ outlier,
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96 List<SQ> remainings
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97 ) {
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98 if (log.isDebugEnabled()) {
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99 log.debug("iterationFinished ----");
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100 log.debug(" num remainings: " + remainings.size());
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101 log.debug(" has outlier: " + outlier != null);
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102 log.debug(" standardDeviation: " + standardDeviation);
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103 log.debug(" Chi^2: " + chiSqr);
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104 log.debug("---- iterationFinished");
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105 }
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106 callback.afterIteration(
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107 coeffs,
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108 remainings.toArray(new SQ[remainings.size()]),
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109 outlier != null ? new SQ [] { outlier} : new SQ [] {},
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110 standardDeviation,
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111 chiSqr);
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112 }
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113
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114 protected static final List<SQ> onlyValid(List<SQ> sqs) {
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115
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116 List<SQ> good = new ArrayList<SQ>(sqs.size());
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117
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118 for (SQ sq: sqs) {
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119 if (sq.isValid()) {
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120 good.add(sq);
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121 }
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122 }
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123
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124 return good;
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125 }
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126
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aaf810d4ec82 Use new state 'outlier mehtod selection' in SQ-relation.
Raimund Renkert <rrenkert@intevation.de>
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127 public boolean fit(List<SQ> sqs, String method, Callback callback) {
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128
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129 sqs = onlyValid(sqs);
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130
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131 if (sqs.size() < 2) {
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132 log.warn("Too less points for fitting.");
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133 return false;
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134 }
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135
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1df6984628c3 S/Q: Extented the result data model of the S/Q calculation to
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136 this.callback = callback;
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137
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138 try {
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139 Outlier.detectOutliers(this, sqs, stdDevFactor, method);
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140 }
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141 catch (MathException me) {
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142 log.warn(me);
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143 return false;
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144 }
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145
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146 return true;
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147 }
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148 }
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149 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org