Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/model/sq/Fitting.java @ 3225:049ccd2c5935
Cosmetics.
flys-artifacts/trunk@4851 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Tue, 03 Jul 2012 05:56:59 +0000 |
parents | 49fe2ed03c12 |
children | 1df6984628c3 |
rev | line source |
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SQ: Added fitting shell for SQ curves.
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1 package de.intevation.flys.artifacts.model.sq; |
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2 |
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3 import de.intevation.flys.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.Iterator; |
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7 import java.util.List; |
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8 |
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9 import org.apache.commons.math.MathException; |
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10 |
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11 import org.apache.commons.math.optimization.fitting.CurveFitter; |
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12 |
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13 import org.apache.commons.math.optimization.general.LevenbergMarquardtOptimizer; |
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14 |
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15 import org.apache.log4j.Logger; |
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16 |
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17 public class Fitting |
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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 protected Function function; |
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22 |
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23 protected double [] parameters; |
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24 |
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25 protected double stdDevFactor; |
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26 |
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27 protected double standardDeviation; |
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28 |
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29 protected double chiSqr; |
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30 |
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31 protected SQ [] remaining; |
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32 |
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33 protected List<SQ []> outliers; |
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34 |
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35 public Fitting() { |
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36 } |
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37 |
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38 public Fitting(Function function, double stdDevFactor) { |
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39 this.function = function; |
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40 this.stdDevFactor = stdDevFactor; |
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41 } |
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42 |
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43 public Function getFunction() { |
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44 return function; |
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45 } |
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46 |
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47 public void setFunction(Function function) { |
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48 this.function = function; |
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49 } |
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50 |
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51 public double [] getParameters() { |
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52 return parameters; |
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53 } |
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54 |
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55 public void setParameters(double [] parameters) { |
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56 this.parameters = parameters; |
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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 public double getStandardDeviation() { |
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68 return standardDeviation; |
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69 } |
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70 |
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71 public void setStandardDeviation(double standardDeviation) { |
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72 this.standardDeviation = standardDeviation; |
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73 } |
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74 |
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75 public double getChiSqr() { |
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76 return chiSqr; |
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77 } |
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78 |
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79 public void setChiSqr(double chiSqr) { |
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80 this.chiSqr = chiSqr; |
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81 } |
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82 |
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83 public SQ [] getRemaining() { |
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84 return remaining; |
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85 } |
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86 |
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87 public void setRemaining(SQ [] remaining) { |
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88 this.remaining = remaining; |
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89 } |
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90 |
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91 public List<SQ []> getOutliers() { |
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92 return outliers; |
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93 } |
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94 |
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95 public void setOutliers(List<SQ []> outliers) { |
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96 this.outliers = outliers; |
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97 } |
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98 |
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99 public void reset() { |
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100 outliers = null; |
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101 remaining = null; |
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102 parameters = null; |
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103 standardDeviation = 0d; |
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104 standardDeviation = 0d; |
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105 chiSqr = 0d; |
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106 } |
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107 |
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108 protected static final List<SQ> onlyValid(List<SQ> sqs) { |
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109 |
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110 List<SQ> good = new ArrayList<SQ>(sqs.size()); |
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111 |
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112 for (SQ sq: sqs) { |
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113 if (sq.isValid()) { |
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114 good.add(sq); |
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115 } |
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116 } |
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117 |
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118 return good; |
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119 } |
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120 |
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121 public boolean fit(List<SQ> sqs) { |
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122 |
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123 sqs = onlyValid(sqs); |
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124 |
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125 if (sqs.size() < 2) { |
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126 log.warn("Too less points for fitting."); |
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127 return false; |
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128 } |
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129 |
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130 final LevenbergMarquardtOptimizer lmo = |
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131 new LevenbergMarquardtOptimizer(); |
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132 |
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133 CurveFitter cf = new CurveFitter(lmo); |
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134 |
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135 for (SQ sq: sqs) { |
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136 cf.addObservedPoint(sq.getQ(), sq.getS()); |
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137 } |
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138 |
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139 try { |
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140 parameters = cf.fit(function, function.getInitialGuess()); |
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141 } |
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142 catch (MathException me) { |
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143 log.warn(me); |
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144 return false; |
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145 } |
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146 |
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147 chiSqr = lmo.getChiSquare(); |
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148 |
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149 final de.intevation.flys.artifacts.math.Function [] instance = { |
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150 function.instantiate(parameters) |
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151 }; |
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152 |
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153 try { |
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154 remaining = Outlier.detectOutliers( |
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155 new Outlier.Callback() { |
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156 |
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157 List<List<SQ>> outliers = |
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158 new ArrayList<List<SQ>>(); |
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159 |
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160 int currentIteration; |
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161 |
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162 @Override |
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163 public double eval(SQ sq) { |
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164 double s = instance[0].value(sq.q); |
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165 return s - sq.s; |
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166 } |
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167 |
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168 @Override |
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169 public void iteration(int i) { |
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170 currentIteration = i; |
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171 } |
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172 |
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173 @Override |
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174 public void outlier(SQ sq) { |
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175 if (currentIteration > outliers.size()) { |
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176 outliers.add(new ArrayList<SQ>(2)); |
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177 } |
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178 outliers.get(currentIteration-1).add(sq); |
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179 } |
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180 |
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181 @Override |
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182 public void standardDeviation(double stdDev) { |
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183 setStandardDeviation(stdDev); |
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184 } |
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185 |
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186 @Override |
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187 public void reinitialize(Iterator<SQ> good) |
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188 throws MathException |
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189 { |
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190 CurveFitter cf = new CurveFitter(lmo); |
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191 while (good.hasNext()) { |
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192 SQ sq = good.next(); |
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193 cf.addObservedPoint(sq.getQ(), sq.getS()); |
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194 } |
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195 |
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196 parameters = cf.fit( |
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197 function, function.getInitialGuess()); |
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198 |
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199 instance[0] = function.instantiate(parameters); |
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200 |
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201 chiSqr = lmo.getChiSquare(); |
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202 } |
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203 |
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204 @Override |
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205 public void finished() { |
3190
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206 List<SQ []> result = |
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207 new ArrayList<SQ []>(outliers.size()); |
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208 |
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209 for (List<SQ> ols: outliers) { |
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210 result.add(ols.toArray(new SQ[ols.size()])); |
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211 } |
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212 |
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213 setOutliers(result); |
3188
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214 } |
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215 }, |
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216 sqs, |
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217 stdDevFactor); |
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218 } |
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219 catch (MathException me) { |
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220 log.warn(me); |
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221 return false; |
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222 } |
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223 |
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224 return true; |
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225 } |
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226 } |
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227 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |