Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Log.java @ 3165:6b13d7e7b403
FixA: Added more debug output.
flys-artifacts/trunk@4778 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Mon, 25 Jun 2012 14:36:46 +0000 |
| parents | 4dda67a893da |
| children | 585c0b49e696 |
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| 3164:6d0567a8387d | 3165:6b13d7e7b403 |
|---|---|
| 31 return parameters[0]*Math.log(x + parameters[1]); | 31 return parameters[0]*Math.log(x + parameters[1]); |
| 32 } | 32 } |
| 33 | 33 |
| 34 @Override | 34 @Override |
| 35 public double [] gradient(double x, double [] parameters) { | 35 public double [] gradient(double x, double [] parameters) { |
| 36 double m = parameters[0]; | |
| 37 double b = parameters[1]; | |
| 38 double b_x = b + x; | |
| 36 return new double [] { | 39 return new double [] { |
| 37 Math.log(x + parameters[1]), | 40 Math.log(b_x), |
| 38 parameters[0]/(x + parameters[0]) | 41 m/b_x |
| 39 }; | 42 }; |
| 40 } | 43 } |
| 41 | 44 |
| 42 @Override | 45 @Override |
| 43 public Derivative getDerivative() { | 46 public Derivative getDerivative() { |