Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/model/sq/SQRelationCalculation.java @ 6780:b8f94e865875

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S/Q relation: Part I of 'faking' fitting linear data. S/Qs can now be subclassed and processed through views. TODO: Add knob to setup a linear data path.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 08 Aug 2013 12:17:03 +0200
parents af13ceeba52a
children 51eb6491c537
rev   line source
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Sascha L. Teichmann <teichmann@intevation.de>
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU AGPL (>=v3)
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the
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6 * documentation coming with Dive4Elements River for details.
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7 */
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8
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9 package org.dive4elements.river.artifacts.model.sq;
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10
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11 import org.dive4elements.river.artifacts.access.SQRelationAccess;
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12
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13 import org.dive4elements.river.artifacts.math.fitting.Function;
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14 import org.dive4elements.river.artifacts.math.fitting.FunctionFactory;
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15
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16 import org.dive4elements.river.artifacts.model.Calculation;
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17 import org.dive4elements.river.artifacts.model.CalculationResult;
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18 import org.dive4elements.river.artifacts.model.DateRange;
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19 import org.dive4elements.river.artifacts.model.Parameters;
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20
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21 import org.dive4elements.river.backend.SedDBSessionHolder;
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22
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23 import java.util.ArrayList;
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24 import java.util.List;
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25
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26 import org.apache.log4j.Logger;
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27
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28 public class SQRelationCalculation extends Calculation {
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29
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30 private static final Logger log =
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31 Logger.getLogger(SQRelationCalculation.class);
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32
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33 public static final String SQ_FUNCTION_NAME = "sq-pow";
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34
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35 protected String river;
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36 protected double location;
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37 protected DateRange period;
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38 protected double outliers;
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39 private String method;
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40
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41 public SQRelationCalculation() {
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42 }
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43
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44 public SQRelationCalculation(SQRelationAccess access) {
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45
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46 String river = access.getRiver();
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47 Double location = access.getLocation();
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48 DateRange period = access.getPeriod();
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49 Double outliers = access.getOutliers();
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50 String method = access.getOutlierMethod();
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51
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52 //river = "Rhein";
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53
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54 if (river == null) {
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55 // TODO: i18n
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56 addProblem("sq.missing.river");
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57 }
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58
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59 if (location == null) {
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60 // TODO: i18n
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61 addProblem("sq.missing.location");
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62 }
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63
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64 if (period == null) {
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65 // TODO: i18n
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66 addProblem("sq.missing.periods");
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67 }
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68
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69 if (outliers == null) {
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70 // TODO: i18n
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71 addProblem("sq.missing.outliers");
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72 }
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73
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74 if (method == null) {
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75 //TODO: i18n
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76 addProblem("sq.missing.method");
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77 }
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78
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79 if (!hasProblems()) {
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80 this.river = river;
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81 this.location = location;
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82 this.period = period;
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83 this.outliers = outliers;
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84 this.method = method;
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85 }
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86 }
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87
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88
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89 public CalculationResult calculate() {
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90 log.debug("SQRelationCalculation.calculate");
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91
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92 if (hasProblems()) {
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93 return new CalculationResult(this);
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94 }
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95
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96 SedDBSessionHolder.acquire();
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97 try {
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98 return internalCalculate();
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99 }
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100 finally {
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101 SedDBSessionHolder.release();
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102 }
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103 }
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104
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105 protected CalculationResult internalCalculate() {
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106
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107 Function function = FunctionFactory
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108 .getInstance()
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109 .getFunction(SQ_FUNCTION_NAME);
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110
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111 if (function == null) {
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112 log.error("No '" + SQ_FUNCTION_NAME + "' function found.");
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113 // TODO: i18n
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114 addProblem("sq.missing.sq.function");
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115 }
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116
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117 SQ.View sqView = SQ.SQ_VIEW;
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118 SQ.Factory sqFactory = SQ.SQ_FACTORY;
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119
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120 Measurements measurements =
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121 MeasurementFactory.getMeasurements(
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122 river, location, period, sqFactory);
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123
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124 SQFractionResult [] fractionResults =
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125 new SQFractionResult[SQResult.NUMBER_FRACTIONS];
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126
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127 for (int i = 0; i < fractionResults.length; ++i) {
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128 List<SQ> sqs = measurements.getSQs(i);
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129
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130 SQFractionResult fractionResult;
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131
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132 List<SQFractionResult.Iteration> iterations =
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133 doFitting(function, sqs, sqView);
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134
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135 if (iterations == null) {
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136 // TODO: i18n
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137 addProblem("sq.fitting.failed." + i);
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138 fractionResult = new SQFractionResult();
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139 }
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140 else {
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141 fractionResult = new SQFractionResult(
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142 sqs.toArray(new SQ[sqs.size()]),
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143 iterations);
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144 }
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145
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146 fractionResults[i] = fractionResult;
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147 }
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148
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149 return new CalculationResult(
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150 new SQResult[] { new SQResult(location, fractionResults) },
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151 this);
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152 }
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153
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154 protected List<SQFractionResult.Iteration> doFitting(
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155 final Function function,
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156 List<SQ> sqs,
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157 SQ.View sqView
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158 ) {
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159 final List<SQFractionResult.Iteration> iterations =
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160 new ArrayList<SQFractionResult.Iteration>();
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161
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162 boolean success = new Fitting(function, outliers, sqView).fit(
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163 sqs,
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164 method,
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165 new Fitting.Callback() {
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166 @Override
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167 public void afterIteration(
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168 double [] coeffs,
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169 SQ [] measurements,
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170 SQ [] outliers,
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171 double standardDeviation,
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172 double chiSqr
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173 ) {
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174 Parameters parameters = createParameters(
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175 function.getParameterNames(),
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176 coeffs,
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177 standardDeviation,
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178 chiSqr);
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179 iterations.add(new SQFractionResult.Iteration(
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180 parameters,
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181 measurements,
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182 outliers));
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183 }
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184 });
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185
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186 return success ? iterations : null;
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187 }
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188
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189 public static final Parameters createParameters(
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190 String [] names,
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191 double [] values,
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192 double standardDeviation,
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193 double chiSqr
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194 ) {
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195 String [] columns = new String[names.length + 2];
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196 columns[0] = "chi_sqr";
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197 columns[1] = "std_dev";
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198 System.arraycopy(names, 0, columns, 2, names.length);
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199 Parameters parameters = new Parameters(columns);
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200 int row = parameters.newRow();
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201 parameters.set(row, names, values);
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202 parameters.set(row, "chi_sqr", chiSqr);
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203 parameters.set(row, "std_dev", standardDeviation);
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204 return parameters;
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205 }
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206 }
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207 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf-8 :
http://dive4elements.wald.intevation.org