Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/LogLinear.java @ 3009:4dda67a893da
FixA: Added the derivatives of all fitting functions.
flys-artifacts/trunk@4565 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Thu, 31 May 2012 16:32:03 +0000 |
| parents | 0dd58ab7e118 |
| children | 6b13d7e7b403 |
comparison
equal
deleted
inserted
replaced
| 3008:9e0500d64524 | 3009:4dda67a893da |
|---|---|
| 1 package de.intevation.flys.artifacts.math.fitting; | 1 package de.intevation.flys.artifacts.math.fitting; |
| 2 | 2 |
| 3 public class LogLinear | 3 public class LogLinear |
| 4 extends Function | 4 extends Function |
| 5 { | 5 { |
| 6 public static final Derivative DERIVATIVE = | |
| 7 new Derivative("W'(Q) = a*m/(m*Q + b)") { | |
| 8 | |
| 9 @Override | |
| 10 public de.intevation.flys.artifacts.math.Function | |
| 11 instantiate(double [] parameters) | |
| 12 { | |
| 13 final double a = parameters[0]; | |
| 14 final double m = parameters[1]; | |
| 15 final double b = parameters[2]; | |
| 16 | |
| 17 return new de.intevation.flys.artifacts.math.Function() { | |
| 18 @Override | |
| 19 public double value(double Q) { | |
| 20 return a*m/(m*Q + b); | |
| 21 } | |
| 22 }; | |
| 23 } | |
| 24 }; | |
| 25 | |
| 6 public LogLinear() { | 26 public LogLinear() { |
| 7 super( | 27 super( |
| 8 "log-linear", | 28 "log-linear", |
| 9 "W(Q) = a*ln(m*Q + b)", | 29 "W(Q) = a*ln(m*Q + b)", |
| 10 new String [] { "a", "m", "b" }); | 30 new String [] { "a", "m", "b" }); |
| 22 Math.log(l), | 42 Math.log(l), |
| 23 parameters[0]*x/l, | 43 parameters[0]*x/l, |
| 24 parameters[0]/l | 44 parameters[0]/l |
| 25 }; | 45 }; |
| 26 } | 46 } |
| 47 | |
| 48 @Override | |
| 49 public Derivative getDerivative() { | |
| 50 return DERIVATIVE; | |
| 51 } | |
| 27 } | 52 } |
| 28 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : | 53 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |