Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/utils/DoubleUtil.java @ 6955:94cb1845c667
(issue1452) Coalesce to zero to avoid NaN arithmetic.
author | Andre Heinecke <aheinecke@intevation.de> |
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date | Fri, 30 Aug 2013 15:45:14 +0200 |
parents | 898afcce1d0a |
children | eb4ca9a7eaca |
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 gnu.trove.TDoubleArrayList; |
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14 |
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15 import java.util.Arrays; |
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16 import java.util.Comparator; |
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17 |
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18 import org.apache.log4j.Logger; |
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19 |
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20 /** Utils to deal with Double precision values. */ |
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21 public class DoubleUtil |
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22 { |
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23 /** Private logger. */ |
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24 private static Logger log = Logger.getLogger(DoubleUtil.class); |
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25 |
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26 public static final double DEFAULT_STEP_PRECISION = 1e6; |
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27 |
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28 public static final Comparator<double []> DOUBLE_PAIR_CMP = |
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29 new Comparator<double []>() { |
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30 @Override |
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31 public int compare(double [] a, double [] b) { |
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32 double diff = a[0] - b[0]; |
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33 if (diff < 0d) return -1; |
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34 if (diff > 0d) return +1; |
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35 return 0; |
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36 } |
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37 }; |
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38 |
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39 /** EPSILON for comparison of double precision values. */ |
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40 public static final double EPSILON = 1e-4; |
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41 |
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42 private DoubleUtil() { |
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43 } |
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44 |
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45 public static final double [] explode(double from, double to, double step) { |
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46 return explode(from, to, step, DEFAULT_STEP_PRECISION); |
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47 } |
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48 |
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49 public static final double round(double x, double precision) { |
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50 return Math.round(x * precision)/precision; |
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51 } |
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52 |
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53 public static final double round(double x) { |
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54 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION; |
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55 } |
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56 |
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57 /** |
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58 * Returns array with values from parameter from to to with given step width. |
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59 * from and to are included. |
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60 */ |
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61 public static final double [] explode( |
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62 double from, |
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63 double to, |
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64 double step, |
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65 double precision |
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66 ) { |
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67 double lower = from; |
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68 |
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69 double diff = to - from; |
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70 double tmp = diff / step; |
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71 int num = (int)Math.abs(Math.ceil(tmp)) + 1; |
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72 |
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73 if (num < 1) { |
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74 return new double[0]; |
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75 } |
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76 |
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77 double [] values = new double[num]; |
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78 |
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79 if (from > to) { |
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80 step = -step; |
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81 } |
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82 |
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83 double max = Math.max(from, to); |
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84 |
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85 for (int idx = 0; idx < num; idx++) { |
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86 if (lower - max > EPSILON) { |
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87 return Arrays.copyOfRange(values, 0, idx); |
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88 } |
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89 |
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90 values[idx] = round(lower, precision); |
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91 lower += step; |
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92 } |
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93 |
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94 return values; |
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95 } |
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96 |
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97 public static final double interpolateSorted( |
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98 double [] xs, |
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99 double [] ys, |
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100 double x |
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101 ) { |
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102 int lo = 0, hi = xs.length-1; |
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103 |
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104 int mid = -1; |
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105 |
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106 while (lo <= hi) { |
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107 mid = (lo + hi) >> 1; |
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108 double mx = xs[mid]; |
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109 if (x < mx) hi = mid - 1; |
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110 else if (x > mx) lo = mid + 1; |
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111 else return ys[mid]; |
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112 } |
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113 if (mid < lo) { |
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114 return lo >= xs.length |
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115 ? Double.NaN |
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116 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]); |
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117 } |
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118 return hi < 0 |
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119 ? Double.NaN |
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120 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]); |
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121 } |
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122 |
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123 public static final boolean isIncreasing(double [] array) { |
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124 int inc = 0; |
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125 int dec = 0; |
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126 int sweet = (array.length-1)/2; |
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127 for (int i = 1; i < array.length; ++i) { |
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128 if (array[i] > array[i-1]) { |
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129 if (++inc > sweet) { |
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130 return true; |
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131 } |
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132 } |
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133 else if (++dec > sweet) { |
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134 return false; |
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135 } |
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136 } |
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137 return inc > sweet; |
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138 } |
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139 |
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140 public static final double [] swap(double [] array) { |
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141 int lo = 0; |
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142 int hi = array.length-1; |
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143 while (hi > lo) { |
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144 double t = array[lo]; |
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145 array[lo] = array[hi]; |
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146 array[hi] = t; |
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147 ++lo; |
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148 --hi; |
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149 } |
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150 |
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151 return array; |
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152 } |
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153 |
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154 public static final double [] swapClone(double [] in) { |
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155 double [] out = new double[in.length]; |
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156 |
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157 for (int j = out.length-1, i = 0; j >= 0;) { |
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158 out[j--] = in[i++]; |
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159 } |
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160 |
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161 return out; |
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162 } |
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163 |
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164 public static final double [] sumDiffs(double [] in) { |
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165 double [] out = new double[in.length]; |
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166 |
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167 for (int i = 1; i < out.length; ++i) { |
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168 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); |
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169 } |
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170 |
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171 return out; |
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172 } |
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173 |
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174 public static final double [] fill(int N, double value) { |
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175 double [] result = new double[N]; |
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176 Arrays.fill(result, value); |
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177 return result; |
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178 } |
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179 |
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180 |
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181 /** Use with parseSegments. */ |
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182 public interface SegmentCallback { |
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183 void newSegment(double from, double to, double [] values); |
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184 } |
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185 |
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186 |
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187 /** Call callback for every string split by colon. |
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188 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/ |
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189 public static final void parseSegments( |
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190 String input, |
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191 SegmentCallback callback |
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192 ) { |
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193 TDoubleArrayList vs = new TDoubleArrayList(); |
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194 |
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195 for (String segmentStr: input.split(":")) { |
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196 String [] parts = segmentStr.split(";"); |
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197 if (parts.length < 3) { |
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198 log.warn("invalid segment: '" + segmentStr + "'"); |
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199 continue; |
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200 } |
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201 try { |
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202 double from = Double.parseDouble(parts[0].trim()); |
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203 double to = Double.parseDouble(parts[1].trim()); |
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204 |
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205 vs.resetQuick(); |
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206 |
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207 for (String valueStr: parts[3].split(",")) { |
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208 vs.add(round(Double.parseDouble(valueStr.trim()))); |
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209 } |
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210 |
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211 callback.newSegment(from, to, vs.toNativeArray()); |
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212 } |
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213 catch (NumberFormatException nfe) { |
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214 log.warn("invalid segment: '" + segmentStr + "'"); |
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215 } |
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216 } |
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217 } |
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218 |
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219 public static final boolean isValid(double [][] data) { |
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220 for (double [] ds: data) { |
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221 for (double d: ds) { |
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222 if (Double.isNaN(d)) { |
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223 return false; |
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224 } |
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225 } |
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226 } |
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227 return true; |
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228 } |
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229 |
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230 |
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231 /** In an array of doubles, search and return the maximum value. */ |
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232 public static final double maxInArray(double[] values) { |
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233 double max = - Double.MAX_VALUE; |
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234 for (double d: values) { |
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235 if (d > max) max = d; |
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236 } |
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237 return max; |
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238 } |
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239 |
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240 |
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241 |
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242 /** Sort a and b with a as key. b is ordered accordingly */ |
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243 public static final void sortByFirst(double [] a, double [] b) { |
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244 // XXX: Not efficient but bulletproof. |
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245 double [][] pairs = new double[a.length][2]; |
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246 for (int i = 0; i < a.length; ++i) { |
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247 double [] p = pairs[i]; |
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248 p[0] = a[i]; |
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249 p[1] = b[i]; |
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250 |
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251 } |
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252 Arrays.sort(pairs, DOUBLE_PAIR_CMP); |
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253 for (int i = 0; i < a.length; ++i) { |
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254 double [] p = pairs[i]; |
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255 a[i] = p[0]; |
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256 b[i] = p[1]; |
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257 } |
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258 } |
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259 |
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260 public static void removeNaNs(TDoubleArrayList [] arrays) { |
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261 |
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262 int dest = 0; |
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263 |
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264 int A = arrays.length; |
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265 int N = arrays[0].size(); |
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266 |
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267 OUTER: for (int i = 0; i < N; ++i) { |
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268 for (int j = 0; j < A; ++j) { |
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269 TDoubleArrayList a = arrays[j]; |
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270 double v = a.getQuick(i); |
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271 if (Double.isNaN(v)) { |
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272 continue OUTER; |
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273 } |
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274 a.setQuick(dest, v); |
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275 } |
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276 ++dest; |
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277 } |
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278 |
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279 if (dest < N) { |
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280 for (int i = 0; i < A; ++i) { |
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281 arrays[i].remove(dest, N-dest); |
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282 } |
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283 } |
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284 } |
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285 } |
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286 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |