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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 5449:504a62887217

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Datacage: Compile XPath expressions and reuse them. With the introduction of filters in dc:elements XPath expressions are evalutated very often so compiling them should reduce the overhead significantly.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 27 Mar 2013 10:59:55 +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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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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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