Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 3720:181e250bf989

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Tagged 'flys-artifacts' as 2.9 flys-artifacts/trunk@5375 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Fri, 07 Sep 2012 09:26:45 +0000
parents 0dd58ab7e118
children 1ddbf66a2b0a
rev   line source
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1 package de.intevation.flys.utils;
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3 import java.util.Arrays;
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5 import de.intevation.flys.artifacts.math.Linear;
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6
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7
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8 public class DoubleUtil
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9 {
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10 public static final double DEFAULT_STEP_PRECISION = 1e6;
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11
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12 private DoubleUtil() {
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13 }
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14
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15 public static final double [] explode(double from, double to, double step) {
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16 return explode(from, to, step, DEFAULT_STEP_PRECISION);
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17 }
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18
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19 public static final double round(double x, double precision) {
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20 return Math.round(x * precision)/precision;
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21 }
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22
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23 public static final double round(double x) {
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24 return Math.round(x * DEFAULT_STEP_PRECISION)/DEFAULT_STEP_PRECISION;
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25 }
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26
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27 public static final double [] explode(
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28 double from,
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29 double to,
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30 double step,
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31 double precision
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32 ) {
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33 double lower = from;
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34
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35 double diff = to - from;
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36 double tmp = diff / step;
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37 int num = (int)Math.abs(Math.ceil(tmp)) + 1;
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38
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39 double [] values = new double[num];
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40
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41 if (from > to) {
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42 step = -step;
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43 }
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44
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45 double max = Math.max(from, to);
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46
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47 for (int idx = 0; idx < num; idx++) {
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48 if (lower > max) {
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49 return Arrays.copyOfRange(values, 0, idx);
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50 }
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51
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52 values[idx] = round(lower, precision);
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53 lower += step;
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54 }
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55
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56 return values;
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57 }
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58
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59 public static final double interpolateSorted(
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60 double [] xs,
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61 double [] ys,
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62 double x
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63 ) {
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64 int lo = 0, hi = xs.length-1;
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65
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66 int mid = -1;
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67
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68 while (lo <= hi) {
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69 mid = (lo + hi) >> 1;
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70 double mx = xs[mid];
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71 if (x < mx) hi = mid - 1;
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72 else if (x > mx) lo = mid + 1;
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73 else return ys[mid];
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74 }
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75 if (mid < lo) {
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76 return lo >= xs.length
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77 ? Double.NaN
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78 : Linear.linear(x, xs[mid], xs[mid+1], ys[mid], ys[mid+1]);
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79 }
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80 return hi < 0
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81 ? Double.NaN
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82 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]);
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83 }
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84
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85 public static final boolean isIncreasing(double [] array) {
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86 int inc = 0;
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87 int dec = 0;
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88 int sweet = (array.length-1)/2;
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89 for (int i = 1; i < array.length; ++i) {
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90 if (array[i] > array[i-1]) {
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91 if (++inc > sweet) {
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92 return true;
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93 }
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94 }
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95 else if (++dec > sweet) {
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96 return false;
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97 }
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98 }
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99 return inc > sweet;
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100 }
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101
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102 public static final double [] swap(double [] array) {
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103 int lo = 0;
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104 int hi = array.length-1;
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105 while (hi > lo) {
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106 double t = array[lo];
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107 array[lo] = array[hi];
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108 array[hi] = t;
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109 ++lo;
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110 --hi;
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111 }
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112
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113 return array;
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114 }
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115
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116 public static final double [] swapClone(double [] in) {
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117 double [] out = new double[in.length];
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118
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119 for (int j = out.length-1, i = 0; j >= 0;) {
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120 out[j--] = in[i++];
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121 }
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122
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123 return out;
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124 }
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125
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126 public static final double [] sumDiffs(double [] in) {
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127 double [] out = new double[in.length];
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128
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129 for (int i = 1; i < out.length; ++i) {
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130 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]);
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131 }
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132
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133 return out;
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134 }
2569
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135
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136 public static final double [] fill(int N, double value) {
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137 double [] result = new double[N];
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138 Arrays.fill(result, value);
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139 return result;
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140 }
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141 }
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142 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org