Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/utils/DoubleUtil.java @ 5863:4897a58c8746

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River artifacts: Added new copyright headers.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sun, 28 Apr 2013 14:40:59 +0200
parents 5aa05a7a34b7
children af13ceeba52a
rev   line source
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4897a58c8746 River artifacts: Added new copyright headers.
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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
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17 import org.apache.log4j.Logger;
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18
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19 /** Utils to deal with Double precision values. */
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20 public class DoubleUtil
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21 {
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22 /** Private logger. */
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23 private static Logger log = Logger.getLogger(DoubleUtil.class);
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24
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25 public static final double DEFAULT_STEP_PRECISION = 1e6;
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26
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27 /** EPSILON for comparison of double precision values. */
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28 public static final double EPSILON = 1e-4;
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29
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30 private DoubleUtil() {
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31 }
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32
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33 public static final double [] explode(double from, double to, double step) {
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34 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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35 }
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36
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37 public static final double round(double x, double precision) {
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38 return Math.round(x * precision)/precision;
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39 }
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40
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41 public static final double round(double x) {
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42 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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43 }
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44
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45 /**
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46 * Returns array with values from parameter from to to with given step width.
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47 * from and to are included.
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48 */
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49 public static final double [] explode(
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50 double from,
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51 double to,
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52 double step,
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53 double precision
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54 ) {
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55 double lower = from;
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56
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57 double diff = to - from;
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58 double tmp = diff / step;
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59 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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60
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61 if (num < 1) {
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62 return new double[0];
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63 }
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64
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65 double [] values = new double[num];
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66
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67 if (from > to) {
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68 step = -step;
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69 }
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70
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71 double max = Math.max(from, to);
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72
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73 for (int idx = 0; idx < num; idx++) {
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74 if (lower - max > EPSILON) {
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75 return Arrays.copyOfRange(values, 0, idx);
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76 }
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77
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78 values[idx] = round(lower, precision);
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79 lower += step;
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80 }
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81
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82 return values;
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83 }
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84
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85 public static final double interpolateSorted(
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86 double [] xs,
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87 double [] ys,
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88 double x
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89 ) {
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90 int lo = 0, hi = xs.length-1;
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91
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92 int mid = -1;
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93
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94 while (lo <= hi) {
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95 mid = (lo + hi) >> 1;
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96 double mx = xs[mid];
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97 if (x < mx) hi = mid - 1;
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98 else if (x > mx) lo = mid + 1;
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99 else return ys[mid];
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100 }
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101 if (mid < lo) {
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102 return lo >= xs.length
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103 ? Double.NaN
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104 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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105 }
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106 return hi < 0
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107 ? Double.NaN
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108 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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109 }
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110
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111 public static final boolean isIncreasing(double [] array) {
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112 int inc = 0;
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113 int dec = 0;
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114 int sweet = (array.length-1)/2;
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115 for (int i = 1; i < array.length; ++i) {
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116 if (array[i] > array[i-1]) {
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117 if (++inc > sweet) {
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118 return true;
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119 }
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120 }
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121 else if (++dec > sweet) {
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122 return false;
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123 }
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124 }
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125 return inc > sweet;
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126 }
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127
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128 public static final double [] swap(double [] array) {
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129 int lo = 0;
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130 int hi = array.length-1;
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131 while (hi > lo) {
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132 double t = array[lo];
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133 array[lo] = array[hi];
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134 array[hi] = t;
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135 ++lo;
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136 --hi;
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137 }
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138
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139 return array;
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140 }
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141
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142 public static final double [] swapClone(double [] in) {
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143 double [] out = new double[in.length];
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144
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145 for (int j = out.length-1, i = 0; j >= 0;) {
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146 out[j--] = in[i++];
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147 }
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148
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149 return out;
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150 }
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151
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152 public static final double [] sumDiffs(double [] in) {
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153 double [] out = new double[in.length];
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154
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155 for (int i = 1; i < out.length; ++i) {
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156 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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157 }
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158
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159 return out;
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160 }
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161
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162 public static final double [] fill(int N, double value) {
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163 double [] result = new double[N];
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164 Arrays.fill(result, value);
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165 return result;
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166 }
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167
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168
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169 /** Use with parseSegments. */
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170 public interface SegmentCallback {
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171 void newSegment(double from, double to, double [] values);
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172 }
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173
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174
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175 /** Call callback for every string split by colon.
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176 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/
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177 public static final void parseSegments(
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178 String input,
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179 SegmentCallback callback
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180 ) {
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181 TDoubleArrayList vs = new TDoubleArrayList();
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182
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183 for (String segmentStr: input.split(":")) {
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184 String [] parts = segmentStr.split(";");
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185 if (parts.length < 3) {
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186 log.warn("invalid segment: '" + segmentStr + "'");
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187 continue;
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188 }
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189 try {
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190 double from = Double.parseDouble(parts[0].trim());
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191 double to = Double.parseDouble(parts[1].trim());
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192
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193 vs.resetQuick();
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194
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195 for (String valueStr: parts[3].split(",")) {
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196 vs.add(round(Double.parseDouble(valueStr.trim())));
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197 }
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198
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199 callback.newSegment(from, to, vs.toNativeArray());
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200 }
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201 catch (NumberFormatException nfe) {
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202 log.warn("invalid segment: '" + segmentStr + "'");
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203 }
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204 }
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205 }
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206
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207 public static final boolean isValid(double [][] data) {
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208 for (double [] ds: data) {
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209 for (double d: ds) {
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210 if (Double.isNaN(d)) {
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211 return false;
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212 }
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213 }
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214 }
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215 return true;
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216 }
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217
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218
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219 /** In an array of doubles, search and return the maximum value. */
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220 public static final double maxInArray(double[] values) {
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221 double max = - Double.MAX_VALUE;
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222 for (double d: values) {
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223 if (d > max) max = d;
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224 }
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225 return max;
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226 }
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227
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228 public static void removeNaNs(TDoubleArrayList [] arrays) {
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229
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230 int dest = 0;
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231
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232 int A = arrays.length;
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233 int N = arrays[0].size();
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234
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
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235 OUTER: for (int i = 0; i < N; ++i) {
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
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236 for (int j = 0; j < A; ++j) {
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
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237 TDoubleArrayList a = arrays[j];
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
238 double v = a.getQuick(i);
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
239 if (Double.isNaN(v)) {
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
240 continue OUTER;
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
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241 }
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
242 a.setQuick(dest, v);
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
243 }
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
244 ++dest;
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
245 }
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
246
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
247 if (dest < N) {
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
248 for (int i = 0; i < A; ++i) {
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
249 arrays[i].remove(dest, N-dest);
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
250 }
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
251 }
bcf25d8c183e Moved NaN removal code from W to DoubleUtil. Create QKms when calculating the 'Umhuellende'.
Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
252 }
655
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
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253 }
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
254 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org