Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 5150:345f3bba6f15

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Doc fixes.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Fri, 01 Mar 2013 09:51:43 +0100
parents 5f70c73b11ed
children 240ff7aeb6de
rev   line source
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1 package de.intevation.flys.utils;
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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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7 import java.util.Arrays;
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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 private DoubleUtil() {
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20 }
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21
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22 public static final double [] explode(double from, double to, double step) {
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23 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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24 }
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25
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26 public static final double round(double x, double precision) {
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27 return Math.round(x * precision)/precision;
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28 }
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29
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30 public static final double round(double x) {
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31 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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32 }
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33
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34 /**
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35 * Returns array with values from parameter from to to with given step width.
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36 * from and to are included.
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37 */
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38 public static final double [] explode(
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39 double from,
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40 double to,
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41 double step,
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42 double precision
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43 ) {
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44 double lower = from;
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45
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46 double diff = to - from;
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47 double tmp = diff / step;
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48 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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49
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50 if (num < 1) {
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51 return new double[0];
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52 }
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53
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54 double [] values = new double[num];
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55
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56 if (from > to) {
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57 step = -step;
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58 }
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59
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60 double max = Math.max(from, to);
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61
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62 for (int idx = 0; idx < num; idx++) {
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63 if (lower > max) {
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64 return Arrays.copyOfRange(values, 0, idx);
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65 }
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66
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67 values[idx] = round(lower, precision);
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68 lower += step;
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69 }
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70
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71 return values;
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72 }
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73
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74 public static final double interpolateSorted(
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75 double [] xs,
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76 double [] ys,
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77 double x
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78 ) {
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79 int lo = 0, hi = xs.length-1;
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80
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81 int mid = -1;
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82
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83 while (lo <= hi) {
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84 mid = (lo + hi) >> 1;
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85 double mx = xs[mid];
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86 if (x < mx) hi = mid - 1;
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87 else if (x > mx) lo = mid + 1;
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88 else return ys[mid];
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89 }
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90 if (mid < lo) {
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91 return lo >= xs.length
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92 ? Double.NaN
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93 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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94 }
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95 return hi < 0
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96 ? Double.NaN
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97 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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98 }
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99
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100 public static final boolean isIncreasing(double [] array) {
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101 int inc = 0;
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102 int dec = 0;
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103 int sweet = (array.length-1)/2;
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104 for (int i = 1; i < array.length; ++i) {
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105 if (array[i] > array[i-1]) {
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106 if (++inc > sweet) {
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107 return true;
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108 }
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109 }
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110 else if (++dec > sweet) {
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111 return false;
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112 }
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113 }
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114 return inc > sweet;
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115 }
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116
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117 public static final double [] swap(double [] array) {
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118 int lo = 0;
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119 int hi = array.length-1;
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120 while (hi > lo) {
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121 double t = array[lo];
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122 array[lo] = array[hi];
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123 array[hi] = t;
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124 ++lo;
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125 --hi;
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126 }
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127
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128 return array;
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129 }
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130
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131 public static final double [] swapClone(double [] in) {
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132 double [] out = new double[in.length];
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133
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134 for (int j = out.length-1, i = 0; j >= 0;) {
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135 out[j--] = in[i++];
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136 }
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137
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138 return out;
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139 }
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140
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141 public static final double [] sumDiffs(double [] in) {
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142 double [] out = new double[in.length];
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143
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144 for (int i = 1; i < out.length; ++i) {
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145 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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146 }
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147
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148 return out;
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149 }
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150
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151 public static final double [] fill(int N, double value) {
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152 double [] result = new double[N];
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153 Arrays.fill(result, value);
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154 return result;
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155 }
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156
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157
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158 /** Use with parseSegments. */
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159 public interface SegmentCallback {
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160 void newSegment(double from, double to, double [] values);
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161 }
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162
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163
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164 /** Call callback for every string split by colon.
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165 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/
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166 public static final void parseSegments(
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167 String input,
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168 SegmentCallback callback
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169 ) {
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170 TDoubleArrayList vs = new TDoubleArrayList();
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171
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172 for (String segmentStr: input.split(":")) {
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173 String [] parts = segmentStr.split(";");
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174 if (parts.length < 3) {
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175 log.warn("invalid segment: '" + segmentStr + "'");
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176 continue;
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177 }
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178 try {
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179 double from = Double.parseDouble(parts[0].trim());
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180 double to = Double.parseDouble(parts[1].trim());
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181
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182 vs.resetQuick();
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183
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184 for (String valueStr: parts[3].split(",")) {
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185 vs.add(round(Double.parseDouble(valueStr.trim())));
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186 }
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187
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188 callback.newSegment(from, to, vs.toNativeArray());
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189 }
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190 catch (NumberFormatException nfe) {
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191 log.warn("invalid segment: '" + segmentStr + "'");
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192 }
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193 }
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194 }
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195
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196 public static final boolean isValid(double [][] data) {
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197 for (double [] ds: data) {
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198 for (double d: ds) {
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199 if (Double.isNaN(d)) {
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200 return false;
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201 }
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202 }
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203 }
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204 return true;
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205 }
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206
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207
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208 /** In an array of doubles, search and return the maximum value. */
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209 public static final double maxInArray(double[] values) {
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210 double max = - Double.MAX_VALUE;
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211 for (double d: values) {
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212 if (d > max) max = d;
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213 }
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214 return max;
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215 }
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216
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217 public static void removeNaNs(TDoubleArrayList [] arrays) {
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218
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219 int dest = 0;
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220
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221 int A = arrays.length;
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222 int N = arrays[0].size();
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223
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224 OUTER: for (int i = 0; i < N; ++i) {
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225 for (int j = 0; j < A; ++j) {
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226 TDoubleArrayList a = arrays[j];
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227 double v = a.getQuick(i);
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228 if (Double.isNaN(v)) {
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229 continue OUTER;
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230 }
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231 a.setQuick(dest, v);
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232 }
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Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
diff changeset
233 ++dest;
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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234 }
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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235
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 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
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237 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
238 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
239 }
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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240 }
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
241 }
655
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
242 }
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
243 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org