Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/LogLinear.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 |
|---|---|
| 35 return parameters[0]*Math.log(parameters[1]*x + parameters[2]); | 35 return parameters[0]*Math.log(parameters[1]*x + parameters[2]); |
| 36 } | 36 } |
| 37 | 37 |
| 38 @Override | 38 @Override |
| 39 public double [] gradient(double x, double [] parameters) { | 39 public double [] gradient(double x, double [] parameters) { |
| 40 double l = parameters[1]*x + parameters[2]; | 40 double a = parameters[0]; |
| 41 double m = parameters[1]; | |
| 42 double b = parameters[2]; | |
| 43 | |
| 44 double lin = m*x + b; | |
| 45 | |
| 41 return new double [] { | 46 return new double [] { |
| 42 Math.log(l), | 47 Math.log(lin), |
| 43 parameters[0]*x/l, | 48 a*x / lin, |
| 44 parameters[0]/l | 49 a / lin |
| 45 }; | 50 }; |
| 46 } | 51 } |
| 47 | 52 |
| 48 @Override | 53 @Override |
| 49 public Derivative getDerivative() { | 54 public Derivative getDerivative() { |