Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 4052:6d8c7a00e74e

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Do cumentation.
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Mon, 08 Oct 2012 09:51:03 +0200
parents a5f65e8983be
children 2b4f78ccfbaa
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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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 public static final double [] explode(
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35 double from,
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36 double to,
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37 double step,
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38 double precision
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39 ) {
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40 double lower = from;
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41
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42 double diff = to - from;
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43 double tmp = diff / step;
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44 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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45
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46 double [] values = new double[num];
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47
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48 if (from > to) {
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49 step = -step;
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50 }
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51
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52 double max = Math.max(from, to);
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53
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54 for (int idx = 0; idx < num; idx++) {
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55 if (lower > max) {
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56 return Arrays.copyOfRange(values, 0, idx);
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57 }
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58
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59 values[idx] = round(lower, precision);
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60 lower += step;
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61 }
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62
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63 return values;
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64 }
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65
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66 public static final double interpolateSorted(
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67 double [] xs,
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68 double [] ys,
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69 double x
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70 ) {
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71 int lo = 0, hi = xs.length-1;
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72
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73 int mid = -1;
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74
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75 while (lo <= hi) {
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76 mid = (lo + hi) >> 1;
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77 double mx = xs[mid];
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78 if (x < mx) hi = mid - 1;
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79 else if (x > mx) lo = mid + 1;
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80 else return ys[mid];
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81 }
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82 if (mid < lo) {
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83 return lo >= xs.length
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84 ? Double.NaN
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85 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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86 }
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87 return hi < 0
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88 ? Double.NaN
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89 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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90 }
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91
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92 public static final boolean isIncreasing(double [] array) {
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93 int inc = 0;
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94 int dec = 0;
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95 int sweet = (array.length-1)/2;
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96 for (int i = 1; i < array.length; ++i) {
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97 if (array[i] > array[i-1]) {
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98 if (++inc > sweet) {
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99 return true;
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100 }
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101 }
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102 else if (++dec > sweet) {
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103 return false;
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104 }
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105 }
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106 return inc > sweet;
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107 }
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108
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109 public static final double [] swap(double [] array) {
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110 int lo = 0;
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111 int hi = array.length-1;
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112 while (hi > lo) {
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113 double t = array[lo];
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114 array[lo] = array[hi];
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115 array[hi] = t;
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116 ++lo;
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117 --hi;
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118 }
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119
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120 return array;
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121 }
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122
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123 public static final double [] swapClone(double [] in) {
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124 double [] out = new double[in.length];
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125
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126 for (int j = out.length-1, i = 0; j >= 0;) {
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127 out[j--] = in[i++];
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128 }
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129
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130 return out;
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131 }
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132
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133 public static final double [] sumDiffs(double [] in) {
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134 double [] out = new double[in.length];
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135
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136 for (int i = 1; i < out.length; ++i) {
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137 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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138 }
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139
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140 return out;
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141 }
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142
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143 public static final double [] fill(int N, double value) {
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144 double [] result = new double[N];
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145 Arrays.fill(result, value);
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146 return result;
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147 }
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148
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149
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150 /** Use with parseSegments. */
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151 public interface SegmentCallback {
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152 void newSegment(double from, double to, double [] values);
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153 }
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154
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155
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156 /** Call callback for every string split by colon.
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157 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/
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158 public static final void parseSegments(
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159 String input,
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160 SegmentCallback callback
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161 ) {
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162 TDoubleArrayList vs = new TDoubleArrayList();
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163
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164 for (String segmentStr: input.split(":")) {
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165 String [] parts = segmentStr.split(";");
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166 if (parts.length < 3) {
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167 log.warn("invalid segment: '" + segmentStr + "'");
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168 continue;
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169 }
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170 try {
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171 double from = Double.parseDouble(parts[0].trim());
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172 double to = Double.parseDouble(parts[1].trim());
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173
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174 vs.resetQuick();
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175
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176 for (String valueStr: parts[2].split(",")) {
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177 vs.add(round(Double.parseDouble(valueStr.trim())));
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178 }
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179
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180 callback.newSegment(from, to, vs.toNativeArray());
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181 }
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182 catch (NumberFormatException nfe) {
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183 log.warn("invalid segment: '" + segmentStr + "'");
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184 }
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185 }
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186 }
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187
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188 public static final boolean isValid(double [][] data) {
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189 for (double [] ds: data) {
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190 for (double d: ds) {
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191 if (Double.isNaN(d)) {
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192 return false;
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193 }
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194 }
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195 }
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196 return true;
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197 }
655
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198 }
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199 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org