Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 5699:5fca0d0d8aac
Use correct i18n string for y axis.
author | Raimund Renkert <rrenkert@intevation.de> |
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date | Mon, 15 Apr 2013 11:16:39 +0200 |
parents | 240ff7aeb6de |
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1 package de.intevation.flys.utils; |
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2 |
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3 import de.intevation.flys.artifacts.math.Linear; |
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4 |
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5 import gnu.trove.TDoubleArrayList; |
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6 |
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7 import java.util.Arrays; |
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8 |
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9 import org.apache.log4j.Logger; |
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10 |
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11 /** Utils to deal with Double precision values. */ |
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12 public class DoubleUtil |
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13 { |
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14 /** Private logger. */ |
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15 private static Logger log = Logger.getLogger(DoubleUtil.class); |
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16 |
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17 public static final double DEFAULT_STEP_PRECISION = 1e6; |
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18 |
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19 /** EPSILON for comparison of double precision values. */ |
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20 public static final double EPSILON = 1e-4; |
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21 |
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22 private DoubleUtil() { |
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23 } |
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24 |
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25 public static final double [] explode(double from, double to, double step) { |
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26 return explode(from, to, step, DEFAULT_STEP_PRECISION); |
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27 } |
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28 |
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29 public static final double round(double x, double precision) { |
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30 return Math.round(x * precision)/precision; |
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31 } |
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32 |
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33 public static final double round(double x) { |
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34 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION; |
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35 } |
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36 |
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37 /** |
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38 * Returns array with values from parameter from to to with given step width. |
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39 * from and to are included. |
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40 */ |
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41 public static final double [] explode( |
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42 double from, |
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43 double to, |
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44 double step, |
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45 double precision |
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46 ) { |
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47 double lower = from; |
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48 |
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49 double diff = to - from; |
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50 double tmp = diff / step; |
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51 int num = (int)Math.abs(Math.ceil(tmp)) + 1; |
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52 |
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53 if (num < 1) { |
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54 return new double[0]; |
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55 } |
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56 |
655
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57 double [] values = new double[num]; |
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58 |
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59 if (from > to) { |
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60 step = -step; |
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61 } |
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62 |
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63 double max = Math.max(from, to); |
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64 |
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65 for (int idx = 0; idx < num; idx++) { |
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66 if (lower - max > EPSILON) { |
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67 return Arrays.copyOfRange(values, 0, idx); |
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68 } |
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69 |
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70 values[idx] = round(lower, precision); |
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71 lower += step; |
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72 } |
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73 |
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74 return values; |
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75 } |
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76 |
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77 public static final double interpolateSorted( |
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78 double [] xs, |
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79 double [] ys, |
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80 double x |
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81 ) { |
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82 int lo = 0, hi = xs.length-1; |
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83 |
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84 int mid = -1; |
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85 |
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86 while (lo <= hi) { |
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87 mid = (lo + hi) >> 1; |
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88 double mx = xs[mid]; |
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89 if (x < mx) hi = mid - 1; |
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90 else if (x > mx) lo = mid + 1; |
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91 else return ys[mid]; |
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92 } |
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93 if (mid < lo) { |
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94 return lo >= xs.length |
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95 ? Double.NaN |
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96 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]); |
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97 } |
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98 return hi < 0 |
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99 ? Double.NaN |
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100 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]); |
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101 } |
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102 |
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103 public static final boolean isIncreasing(double [] array) { |
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104 int inc = 0; |
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105 int dec = 0; |
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106 int sweet = (array.length-1)/2; |
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107 for (int i = 1; i < array.length; ++i) { |
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108 if (array[i] > array[i-1]) { |
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109 if (++inc > sweet) { |
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110 return true; |
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111 } |
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112 } |
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113 else if (++dec > sweet) { |
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114 return false; |
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115 } |
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116 } |
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117 return inc > sweet; |
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118 } |
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119 |
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120 public static final double [] swap(double [] array) { |
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121 int lo = 0; |
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122 int hi = array.length-1; |
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123 while (hi > lo) { |
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124 double t = array[lo]; |
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125 array[lo] = array[hi]; |
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126 array[hi] = t; |
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127 ++lo; |
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128 --hi; |
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129 } |
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130 |
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131 return array; |
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132 } |
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133 |
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134 public static final double [] swapClone(double [] in) { |
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135 double [] out = new double[in.length]; |
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136 |
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137 for (int j = out.length-1, i = 0; j >= 0;) { |
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138 out[j--] = in[i++]; |
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139 } |
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140 |
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141 return out; |
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142 } |
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143 |
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144 public static final double [] sumDiffs(double [] in) { |
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145 double [] out = new double[in.length]; |
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146 |
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147 for (int i = 1; i < out.length; ++i) { |
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148 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); |
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149 } |
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150 |
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151 return out; |
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152 } |
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153 |
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154 public static final double [] fill(int N, double value) { |
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155 double [] result = new double[N]; |
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156 Arrays.fill(result, value); |
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157 return result; |
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158 } |
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159 |
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160 |
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161 /** Use with parseSegments. */ |
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162 public interface SegmentCallback { |
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163 void newSegment(double from, double to, double [] values); |
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164 } |
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165 |
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166 |
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167 /** Call callback for every string split by colon. |
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168 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/ |
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169 public static final void parseSegments( |
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170 String input, |
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171 SegmentCallback callback |
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172 ) { |
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173 TDoubleArrayList vs = new TDoubleArrayList(); |
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174 |
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175 for (String segmentStr: input.split(":")) { |
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176 String [] parts = segmentStr.split(";"); |
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177 if (parts.length < 3) { |
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178 log.warn("invalid segment: '" + segmentStr + "'"); |
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179 continue; |
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180 } |
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181 try { |
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182 double from = Double.parseDouble(parts[0].trim()); |
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183 double to = Double.parseDouble(parts[1].trim()); |
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184 |
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185 vs.resetQuick(); |
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186 |
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187 for (String valueStr: parts[3].split(",")) { |
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188 vs.add(round(Double.parseDouble(valueStr.trim()))); |
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189 } |
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190 |
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191 callback.newSegment(from, to, vs.toNativeArray()); |
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192 } |
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193 catch (NumberFormatException nfe) { |
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194 log.warn("invalid segment: '" + segmentStr + "'"); |
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195 } |
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196 } |
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197 } |
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198 |
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199 public static final boolean isValid(double [][] data) { |
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200 for (double [] ds: data) { |
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201 for (double d: ds) { |
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202 if (Double.isNaN(d)) { |
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203 return false; |
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204 } |
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205 } |
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206 } |
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207 return true; |
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209 |
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211 /** In an array of doubles, search and return the maximum value. */ |
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212 public static final double maxInArray(double[] values) { |
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213 double max = - Double.MAX_VALUE; |
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214 for (double d: values) { |
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215 if (d > max) max = d; |
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216 } |
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217 return max; |
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218 } |
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219 |
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220 public static void removeNaNs(TDoubleArrayList [] arrays) { |
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221 |
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222 int dest = 0; |
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223 |
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224 int A = arrays.length; |
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225 int N = arrays[0].size(); |
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226 |
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227 OUTER: for (int i = 0; i < N; ++i) { |
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228 for (int j = 0; j < A; ++j) { |
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229 TDoubleArrayList a = arrays[j]; |
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230 double v = a.getQuick(i); |
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231 if (Double.isNaN(v)) { |
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232 continue OUTER; |
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233 } |
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234 a.setQuick(dest, v); |
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235 } |
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236 ++dest; |
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237 } |
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238 |
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239 if (dest < N) { |
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240 for (int i = 0; i < A; ++i) { |
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241 arrays[i].remove(dest, N-dest); |
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242 } |
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243 } |
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246 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |