Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 3045:0905d1e7b37e
Fix certain GaugeDischargeArtifact issues.
flys-artifacts/trunk@4614 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 06 Jun 2012 15:46:49 +0000 |
parents | 0dd58ab7e118 |
children | 1ddbf66a2b0a |
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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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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 } |
655
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141 } |
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142 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |