Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/BackJumpCorrector.java @ 662:60f24fca574a
BackJumpCorrector: Simpified array swapping.
flys-artifacts/trunk@2072 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Tue, 07 Jun 2011 21:01:09 +0000 |
| parents | 44175d4720f8 |
| children | d5f9ba1d055f |
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| 661:fdc898a134a7 | 662:60f24fca574a |
|---|---|
| 262 } | 262 } |
| 263 | 263 |
| 264 return array; | 264 return array; |
| 265 } | 265 } |
| 266 | 266 |
| 267 public static final double [] swapClone(double [] array) { | 267 public static final double [] swapClone(double [] in) { |
| 268 double [] out = new double[array.length]; | 268 double [] out = new double[in.length]; |
| 269 int lo = 0; | 269 |
| 270 | 270 for (int j = out.length-1, i = 0; j >= 0;) { |
| 271 int hi = array.length-1; | 271 out[j--] = in[i++]; |
| 272 while (hi > lo) { | 272 } |
| 273 out[lo] = array[hi]; | 273 |
| 274 out[hi] = array[lo]; | |
| 275 ++lo; | |
| 276 --hi; | |
| 277 } | |
| 278 return out; | 274 return out; |
| 279 } | 275 } |
| 280 | 276 |
| 281 public static final double [] sumDiffs(double [] in) { | 277 public static final double [] sumDiffs(double [] in) { |
| 282 double [] out = new double[in.length]; | 278 double [] out = new double[in.length]; |
| 283 | 279 |
| 284 if (out.length > 0) { | |
| 285 out[0] = 0d; | |
| 286 } | |
| 287 | |
| 288 for (int i = 1; i < out.length; ++i) { | 280 for (int i = 1; i < out.length; ++i) { |
| 289 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); | 281 out[i] = out[i-1] + Math.abs(in[i-1] - in[i]); |
| 290 } | 282 } |
| 291 | 283 |
| 292 return out; | 284 return out; |