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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 5462:f2371f3aaf03

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Show top level folder icons only if node has no factory If you have an empty folder the folder icon is still shown. This makes it possible to add functional "Top Level" entries in the Datacage
author Andre Heinecke <aheinecke@intevation.de>
date Tue, 26 Mar 2013 18:29:13 +0100
parents 240ff7aeb6de
children
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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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
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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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208 }
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209
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210
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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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Sascha L. Teichmann <teichmann@intevation.de>
parents: 4433
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233 }
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 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
235 }
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
236 ++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
237 }
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
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 (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
240 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
241 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
242 }
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 }
655
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
245 }
913b52064449 Refactored version of "Berechnung 4"
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents:
diff changeset
246 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org