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annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 4740:fb135e1dfa35

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Added 'type' attribute to <dc:variable/> element. If an optional 'type' attribute is given the result of the XPATH expression is interpreted as this type. Valid values are 'number', 'bool', 'node' and 'nodeset'. All other defaults to 'string' which also is the default if nor type is given.
author Sascha L. Teichmann <teichmann@intevation.de>
date Wed, 02 Jan 2013 15:31:53 +0100
parents 5b8919ef601d
children bcf25d8c183e
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 if (num < 1) {
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47 return new double[0];
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48 }
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49
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50 double [] values = new double[num];
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51
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52 if (from > to) {
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53 step = -step;
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54 }
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55
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56 double max = Math.max(from, to);
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57
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58 for (int idx = 0; idx < num; idx++) {
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59 if (lower > max) {
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60 return Arrays.copyOfRange(values, 0, idx);
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61 }
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62
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63 values[idx] = round(lower, precision);
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64 lower += step;
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65 }
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66
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67 return values;
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68 }
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69
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70 public static final double interpolateSorted(
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71 double [] xs,
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72 double [] ys,
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73 double x
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74 ) {
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75 int lo = 0, hi = xs.length-1;
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76
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77 int mid = -1;
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78
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79 while (lo <= hi) {
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80 mid = (lo + hi) >> 1;
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81 double mx = xs[mid];
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82 if (x < mx) hi = mid - 1;
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83 else if (x > mx) lo = mid + 1;
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84 else return ys[mid];
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85 }
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86 if (mid < lo) {
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87 return lo >= xs.length
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88 ? Double.NaN
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89 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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90 }
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91 return hi < 0
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92 ? Double.NaN
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93 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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94 }
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95
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96 public static final boolean isIncreasing(double [] array) {
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97 int inc = 0;
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98 int dec = 0;
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99 int sweet = (array.length-1)/2;
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100 for (int i = 1; i < array.length; ++i) {
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101 if (array[i] > array[i-1]) {
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102 if (++inc > sweet) {
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103 return true;
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104 }
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105 }
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106 else if (++dec > sweet) {
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107 return false;
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108 }
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109 }
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110 return inc > sweet;
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111 }
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112
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113 public static final double [] swap(double [] array) {
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114 int lo = 0;
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115 int hi = array.length-1;
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116 while (hi > lo) {
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117 double t = array[lo];
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118 array[lo] = array[hi];
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119 array[hi] = t;
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120 ++lo;
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121 --hi;
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122 }
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123
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124 return array;
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125 }
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126
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127 public static final double [] swapClone(double [] in) {
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128 double [] out = new double[in.length];
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129
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130 for (int j = out.length-1, i = 0; j >= 0;) {
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131 out[j--] = in[i++];
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132 }
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133
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134 return out;
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135 }
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136
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137 public static final double [] sumDiffs(double [] in) {
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138 double [] out = new double[in.length];
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139
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140 for (int i = 1; i < out.length; ++i) {
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141 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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142 }
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143
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144 return out;
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145 }
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146
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147 public static final double [] fill(int N, double value) {
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148 double [] result = new double[N];
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149 Arrays.fill(result, value);
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150 return result;
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151 }
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152
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153
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154 /** Use with parseSegments. */
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155 public interface SegmentCallback {
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156 void newSegment(double from, double to, double [] values);
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157 }
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158
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159
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160 /** Call callback for every string split by colon.
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161 * Expected format FROM:TO:VALUE1,VALUE2,VALUE3*/
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162 public static final void parseSegments(
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163 String input,
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164 SegmentCallback callback
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165 ) {
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166 TDoubleArrayList vs = new TDoubleArrayList();
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167
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168 for (String segmentStr: input.split(":")) {
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169 String [] parts = segmentStr.split(";");
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170 if (parts.length < 3) {
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171 log.warn("invalid segment: '" + segmentStr + "'");
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172 continue;
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173 }
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174 try {
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175 double from = Double.parseDouble(parts[0].trim());
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176 double to = Double.parseDouble(parts[1].trim());
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177
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178 vs.resetQuick();
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179
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180 for (String valueStr: parts[2].split(",")) {
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181 vs.add(round(Double.parseDouble(valueStr.trim())));
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182 }
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183
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184 callback.newSegment(from, to, vs.toNativeArray());
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185 }
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186 catch (NumberFormatException nfe) {
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187 log.warn("invalid segment: '" + segmentStr + "'");
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188 }
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189 }
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190 }
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191
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192 public static final boolean isValid(double [][] data) {
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193 for (double [] ds: data) {
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194 for (double d: ds) {
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195 if (Double.isNaN(d)) {
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196 return false;
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197 }
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198 }
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199 }
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200 return true;
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201 }
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202
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203
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204 /** In an array of doubles, search and return the maximum value. */
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205 public static final double maxInArray(double[] values) {
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206 double max = - Double.MAX_VALUE;
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207 for (double d: values) {
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208 if (d > max) max = d;
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209 }
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210 return max;
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211 }
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212 }
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213 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org