Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/utils/DoubleUtil.java @ 1672:0b6dac664bbb
Moved some generic double array code from BackjumpCorrector to DoubleUtil
flys-artifacts/trunk@2885 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Tue, 04 Oct 2011 15:29:39 +0000 |
| parents | da872168a899 |
| children | 0dd58ab7e118 |
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| 1671:da872168a899 | 1672:0b6dac664bbb |
|---|---|
| 79 } | 79 } |
| 80 return hi < 0 | 80 return hi < 0 |
| 81 ? Double.NaN | 81 ? Double.NaN |
| 82 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]); | 82 : Linear.linear(x, xs[mid-1], xs[mid], ys[mid-1], ys[mid]); |
| 83 } | 83 } |
| 84 | |
| 85 public static final boolean isIncreasing(double [] array) { | |
| 86 int inc = 0; | |
| 87 int dec = 0; | |
| 88 int sweet = (array.length-1)/2; | |
| 89 for (int i = 1; i < array.length; ++i) { | |
| 90 if (array[i] > array[i-1]) { | |
| 91 if (++inc > sweet) { | |
| 92 return true; | |
| 93 } | |
| 94 } | |
| 95 else if (++dec > sweet) { | |
| 96 return false; | |
| 97 } | |
| 98 } | |
| 99 return inc > sweet; | |
| 100 } | |
| 101 | |
| 102 public static final double [] swap(double [] array) { | |
| 103 int lo = 0; | |
| 104 int hi = array.length-1; | |
| 105 while (hi > lo) { | |
| 106 double t = array[lo]; | |
| 107 array[lo] = array[hi]; | |
| 108 array[hi] = t; | |
| 109 ++lo; | |
| 110 --hi; | |
| 111 } | |
| 112 | |
| 113 return array; | |
| 114 } | |
| 115 | |
| 116 public static final double [] swapClone(double [] in) { | |
| 117 double [] out = new double[in.length]; | |
| 118 | |
| 119 for (int j = out.length-1, i = 0; j >= 0;) { | |
| 120 out[j--] = in[i++]; | |
| 121 } | |
| 122 | |
| 123 return out; | |
| 124 } | |
| 125 | |
| 126 public static final double [] sumDiffs(double [] in) { | |
| 127 double [] out = new double[in.length]; | |
| 128 | |
| 129 for (int i = 1; i < out.length; ++i) { | |
| 130 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); | |
| 131 } | |
| 132 | |
| 133 return out; | |
| 134 } | |
| 84 } | 135 } |
| 85 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : | 136 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |