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annotate artifacts/src/main/java/org/dive4elements/river/utils/DoubleUtil.java @ 8587:07c9ac22f611

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(issue1755) Generalise BedQuality result handling The bedquality calculation now produces a result for each time period which has BedQualityResultValues for each specific result type. Formally this was split up in density, porosity and diameter classes with some bedload diameter classes mixed in for extra fun. The intent of this commit is to allow more shared code and generic access patterns to the BedQuality results.
author Andre Heinecke <andre.heinecke@intevation.de>
date Wed, 18 Mar 2015 18:42:08 +0100
parents 073ea4bcea58
children b486812f4f14
rev   line source
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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.utils;
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10
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11 import org.dive4elements.river.artifacts.math.Linear;
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12
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13 import org.apache.commons.math.analysis.interpolation.LinearInterpolator;
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14 import org.apache.commons.math.analysis.polynomials.PolynomialSplineFunction;
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15
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16 import org.apache.commons.math.exception.DimensionMismatchException;
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17 import org.apache.commons.math.exception.NumberIsTooSmallException;
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18 import org.apache.commons.math.exception.NonMonotonousSequenceException;
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19
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20 import gnu.trove.TDoubleArrayList;
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21
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22 import java.util.Arrays;
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23 import java.util.Comparator;
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24
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25 import org.apache.log4j.Logger;
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26
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27 /** Utils to deal with Double precision values. */
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28 public class DoubleUtil
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29 {
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30 /** Private log. */
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31 private static Logger log = Logger.getLogger(DoubleUtil.class);
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32
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33 public static final double DEFAULT_STEP_PRECISION = 1e6;
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34
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35 public static final Comparator<double []> DOUBLE_PAIR_CMP =
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36 new Comparator<double []>() {
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37 @Override
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38 public int compare(double [] a, double [] b) {
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39 double diff = a[0] - b[0];
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40 if (diff < 0d) return -1;
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41 if (diff > 0d) return +1;
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42 return 0;
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43 }
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44 };
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45
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46 /** EPSILON for comparison of double precision values. */
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47 public static final double EPSILON = 1e-4;
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48
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49 private DoubleUtil() {
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50 }
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51
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52 public static final double [] explode(double from, double to, double step) {
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53 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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54 }
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55
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56 public static final double round(double x, double precision) {
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57 return Math.round(x * precision)/precision;
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58 }
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59
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60 public static final double round(double x) {
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61 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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62 }
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63
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64 /**
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65 * Returns array with values from parameter from to to with given step width.
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66 * from and to are included.
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67 */
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68 public static final double [] explode(
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69 double from,
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70 double to,
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71 double step,
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72 double precision
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73 ) {
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74 double lower = from;
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75
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76 double diff = to - from;
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77 double tmp = diff / step;
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78 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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79
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80 if (num < 1) {
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81 return new double[0];
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82 }
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83
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84 double [] values = new double[num];
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85
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86 if (from > to) {
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87 step = -step;
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88 }
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89
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90 double max = Math.max(from, to);
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91
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92 for (int idx = 0; idx < num; idx++) {
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93 if (lower - max > EPSILON) {
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94 return Arrays.copyOfRange(values, 0, idx);
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95 }
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96
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97 values[idx] = round(lower, precision);
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98 lower += step;
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99 }
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100
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101 return values;
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102 }
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103
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104 public static final double interpolateSorted(
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105 double [] xs,
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106 double [] ys,
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107 double x
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108 ) {
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109 int lo = 0, hi = xs.length-1;
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110
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111 int mid = -1;
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112
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113 while (lo <= hi) {
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114 mid = (lo + hi) >> 1;
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115 double mx = xs[mid];
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116 if (x < mx) hi = mid - 1;
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117 else if (x > mx) lo = mid + 1;
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118 else return ys[mid];
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119 }
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120 if (mid < lo) {
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121 return lo >= xs.length
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122 ? Double.NaN
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123 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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124 }
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125 return hi < 0
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126 ? Double.NaN
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127 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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128 }
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129
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130 public static final boolean isIncreasing(double [] array) {
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131 int inc = 0;
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132 int dec = 0;
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133 int sweet = (array.length-1)/2;
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134 for (int i = 1; i < array.length; ++i) {
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135 if (array[i] > array[i-1]) {
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136 if (++inc > sweet) {
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137 return true;
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138 }
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139 }
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140 else if (++dec > sweet) {
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141 return false;
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142 }
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143 }
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144 return inc > sweet;
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145 }
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146
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147 public static final double [] swap(double [] array) {
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148 int lo = 0;
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149 int hi = array.length-1;
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150 while (hi > lo) {
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151 double t = array[lo];
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152 array[lo] = array[hi];
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153 array[hi] = t;
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154 ++lo;
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155 --hi;
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156 }
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157
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158 return array;
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159 }
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160
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161 public static final double [] swapClone(double [] in) {
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162 double [] out = new double[in.length];
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163
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164 for (int j = out.length-1, i = 0; j >= 0;) {
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165 out[j--] = in[i++];
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166 }
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167
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168 return out;
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169 }
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170
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171 public static final double [] sumDiffs(double [] in) {
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172 double [] out = new double[in.length];
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173
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174 for (int i = 1; i < out.length; ++i) {
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175 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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176 }
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177
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178 return out;
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179 }
2569
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180
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181 public static final double sum(double [] values) {
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182 double sum = 0.0;
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183 for (double value: values) {
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184 sum += value;
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185 }
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186 return sum;
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187 }
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188
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189 public static final double [] fill(int N, double value) {
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190 double [] result = new double[N];
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191 Arrays.fill(result, value);
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192 return result;
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193 }
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194
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195
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196 /** Use with parseSegments. */
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197 public interface SegmentCallback {
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198 void newSegment(double from, double to, double [] values);
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199 }
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200
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201
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diff changeset
202 /** Call callback for every string split by colon.
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parents: 4432
diff changeset
203 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/
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204 public static final void parseSegments(
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diff changeset
205 String input,
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diff changeset
206 SegmentCallback callback
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diff changeset
207 ) {
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208 TDoubleArrayList vs = new TDoubleArrayList();
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diff changeset
209
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diff changeset
210 for (String segmentStr: input.split(":")) {
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diff changeset
211 String [] parts = segmentStr.split(";");
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diff changeset
212 if (parts.length < 3) {
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diff changeset
213 log.warn("invalid segment: '" + segmentStr + "'");
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diff changeset
214 continue;
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diff changeset
215 }
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diff changeset
216 try {
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diff changeset
217 double from = Double.parseDouble(parts[0].trim());
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diff changeset
218 double to = Double.parseDouble(parts[1].trim());
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diff changeset
219
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diff changeset
220 vs.resetQuick();
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diff changeset
221
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Raimund Renkert <rrenkert@intevation.de>
parents: 4821
diff changeset
222 for (String valueStr: parts[3].split(",")) {
3776
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diff changeset
223 vs.add(round(Double.parseDouble(valueStr.trim())));
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diff changeset
224 }
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diff changeset
225
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diff changeset
226 callback.newSegment(from, to, vs.toNativeArray());
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diff changeset
227 }
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diff changeset
228 catch (NumberFormatException nfe) {
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diff changeset
229 log.warn("invalid segment: '" + segmentStr + "'");
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diff changeset
230 }
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231 }
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diff changeset
232 }
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diff changeset
233
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diff changeset
234 public static final boolean isValid(double [][] data) {
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diff changeset
235 for (double [] ds: data) {
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diff changeset
236 if (!isValid(ds)) {
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diff changeset
237 return false;
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238 }
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239 }
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240 return true;
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241 }
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242
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243 public static final boolean isValid(double [] data) {
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244 for (double d: data) {
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245 if (Double.isNaN(d)) {
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246 return false;
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247 }
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248 }
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249 return true;
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250 }
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251
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252 public static final boolean isNaN(double [] values) {
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253 for (double value: values) {
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254 if (!Double.isNaN(value)) {
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255 return false;
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256 }
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257 }
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258 return true;
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259 }
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260
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261 /** In an array of doubles, search and return the maximum value. */
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262 public static final double maxInArray(double[] values) {
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263 double max = - Double.MAX_VALUE;
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264 for (double d: values) {
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265 if (d > max) max = d;
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266 }
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267 return max;
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268 }
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269
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270
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271
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272 /** Sort a and b with a as key. b is ordered accordingly */
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273 public static final void sortByFirst(double [] a, double [] b) {
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274 // XXX: Not efficient but bulletproof.
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275 double [][] pairs = new double[a.length][2];
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276 for (int i = 0; i < a.length; ++i) {
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277 double [] p = pairs[i];
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278 p[0] = a[i];
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279 p[1] = b[i];
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280
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281 }
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282 Arrays.sort(pairs, DOUBLE_PAIR_CMP);
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283 for (int i = 0; i < a.length; ++i) {
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284 double [] p = pairs[i];
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285 a[i] = p[0];
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286 b[i] = p[1];
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287 }
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288 }
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289
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290 public static void removeNaNs(TDoubleArrayList [] arrays) {
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291
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292 int dest = 0;
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293
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294 int A = arrays.length;
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295 int N = arrays[0].size();
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296
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297 OUTER: for (int i = 0; i < N; ++i) {
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298 for (int j = 0; j < A; ++j) {
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299 TDoubleArrayList a = arrays[j];
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300 double v = a.getQuick(i);
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301 if (Double.isNaN(v)) {
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302 continue OUTER;
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303 }
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304 a.setQuick(dest, v);
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305 }
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306 ++dest;
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307 }
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308
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309 if (dest < N) {
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310 for (int i = 0; i < A; ++i) {
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311 arrays[i].remove(dest, N-dest);
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312 }
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313 }
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314 }
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315
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316 /** Convieniance function for results to get an interpolator.
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317 * This is basically a static wrapper to for LinearInterpolator.interpolate
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318 * with error handling. Returns null on error.*/
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319 public static PolynomialSplineFunction getLinearInterpolator(double[] x, double[] y) {
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320 LinearInterpolator lpol = new LinearInterpolator();
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321 try {
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322 return lpol.interpolate(x, y);
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323 } catch (DimensionMismatchException e) {
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324 log.error("KMs and Result values have different sizes. Failed to interpolate: " +
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325 e.getMessage());
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326 } catch (NonMonotonousSequenceException e) {
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327 log.error("KMs are not monotonous. Failed to interpolate: " + e.getMessage());
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328 } catch (NumberIsTooSmallException e) {
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329 log.error("Result is to small. Failed to interpolate: " + e.getMessage());
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330 }
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331 return null;
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332 }
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333
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334 public static PolynomialSplineFunction getLinearInterpolator(TDoubleArrayList x, TDoubleArrayList y) {
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335 return getLinearInterpolator(x.toNativeArray(), y.toNativeArray());
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336 }
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337 }
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338 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org