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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 4048:6ed8ebd48d6e

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Removed dead code.
author Sascha L. Teichmann <teichmann@intevation.de>
date Sat, 06 Oct 2012 11:14:23 +0200
parents a5f65e8983be
children 6d8c7a00e74e
rev   line source
655
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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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11 public class DoubleUtil
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12 {
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13 private static Logger log = Logger.getLogger(DoubleUtil.class);
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14
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15 public static final double DEFAULT_STEP_PRECISION = 1e6;
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16
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17 private DoubleUtil() {
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18 }
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19
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20 public static final double [] explode(double from, double to, double step) {
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21 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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22 }
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23
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24 public static final double round(double x, double precision) {
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25 return Math.round(x * precision)/precision;
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26 }
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27
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28 public static final double round(double x) {
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29 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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30 }
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31
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32 public static final double [] explode(
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33 double from,
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34 double to,
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35 double step,
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36 double precision
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37 ) {
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38 double lower = from;
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39
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40 double diff = to - from;
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41 double tmp = diff / step;
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42 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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43
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44 double [] values = new double[num];
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45
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46 if (from > to) {
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47 step = -step;
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48 }
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49
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50 double max = Math.max(from, to);
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51
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52 for (int idx = 0; idx < num; idx++) {
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53 if (lower > max) {
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54 return Arrays.copyOfRange(values, 0, idx);
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55 }
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56
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57 values[idx] = round(lower, precision);
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58 lower += step;
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59 }
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60
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61 return values;
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62 }
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63
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64 public static final double interpolateSorted(
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65 double [] xs,
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66 double [] ys,
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67 double x
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68 ) {
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69 int lo = 0, hi = xs.length-1;
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70
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71 int mid = -1;
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72
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73 while (lo <= hi) {
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74 mid = (lo + hi) >> 1;
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75 double mx = xs[mid];
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76 if (x < mx) hi = mid - 1;
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77 else if (x > mx) lo = mid + 1;
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78 else return ys[mid];
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79 }
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80 if (mid < lo) {
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81 return lo >= xs.length
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82 ? Double.NaN
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83 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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84 }
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85 return hi < 0
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86 ? Double.NaN
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87 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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88 }
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89
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90 public static final boolean isIncreasing(double [] array) {
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91 int inc = 0;
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92 int dec = 0;
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93 int sweet = (array.length-1)/2;
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94 for (int i = 1; i < array.length; ++i) {
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95 if (array[i] > array[i-1]) {
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96 if (++inc > sweet) {
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97 return true;
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98 }
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99 }
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100 else if (++dec > sweet) {
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101 return false;
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102 }
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103 }
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104 return inc > sweet;
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105 }
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106
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107 public static final double [] swap(double [] array) {
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108 int lo = 0;
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109 int hi = array.length-1;
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110 while (hi > lo) {
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111 double t = array[lo];
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112 array[lo] = array[hi];
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113 array[hi] = t;
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114 ++lo;
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115 --hi;
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116 }
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117
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118 return array;
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119 }
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120
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121 public static final double [] swapClone(double [] in) {
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122 double [] out = new double[in.length];
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123
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124 for (int j = out.length-1, i = 0; j >= 0;) {
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125 out[j--] = in[i++];
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126 }
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127
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128 return out;
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129 }
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130
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131 public static final double [] sumDiffs(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 i = 1; i < out.length; ++i) {
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135 out[i] = out[i-1] + Math.abs(in[i-1] - 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 [] fill(int N, double value) {
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142 double [] result = new double[N];
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143 Arrays.fill(result, value);
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144 return result;
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145 }
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146
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147 public interface SegmentCallback {
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148 void newSegment(double from, double to, double [] values);
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149 }
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150
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151 public static final void parseSegments(
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152 String input,
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153 SegmentCallback callback
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154 ) {
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155 TDoubleArrayList vs = new TDoubleArrayList();
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156
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157 for (String segmentStr: input.split(":")) {
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158 String [] parts = segmentStr.split(";");
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159 if (parts.length < 3) {
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160 log.warn("invalid segment: '" + segmentStr + "'");
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161 continue;
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162 }
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163 try {
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164 double from = Double.parseDouble(parts[0].trim());
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165 double to = Double.parseDouble(parts[1].trim());
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166
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167 vs.resetQuick();
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168
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169 for (String valueStr: parts[2].split(",")) {
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170 vs.add(round(Double.parseDouble(valueStr.trim())));
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171 }
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172
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173 callback.newSegment(from, to, vs.toNativeArray());
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174 }
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175 catch (NumberFormatException nfe) {
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176 log.warn("invalid segment: '" + segmentStr + "'");
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177 }
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178 }
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179 }
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180
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181 public static final boolean isValid(double [][] data) {
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182 for (double [] ds: data) {
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183 for (double d: ds) {
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184 if (Double.isNaN(d)) {
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185 return false;
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186 }
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187 }
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188 }
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189 return true;
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190 }
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191 }
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192 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org