Mercurial > dive4elements > river
comparison flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Log.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
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inserted
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| 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 Log | 3 public class Log |
| 4 extends Function | 4 extends Function |
| 5 { | 5 { |
| 6 public static final Derivative DERIVATIVE = | |
| 7 new Derivative("W'(Q) = m/(Q+b)") { | |
| 8 | |
| 9 @Override | |
| 10 public de.intevation.flys.artifacts.math.Function | |
| 11 instantiate(double [] parameters) | |
| 12 { | |
| 13 final double m = parameters[0]; | |
| 14 final double b = parameters[1]; | |
| 15 | |
| 16 return new de.intevation.flys.artifacts.math.Function() { | |
| 17 @Override | |
| 18 public double value(double Q) { | |
| 19 return m/(Q+b); | |
| 20 } | |
| 21 }; | |
| 22 } | |
| 23 }; | |
| 24 | |
| 6 public Log() { | 25 public Log() { |
| 7 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" }); | 26 super("log", "W(Q) = m*ln(Q + b)", new String [] { "m", "b" }); |
| 8 } | 27 } |
| 9 | 28 |
| 10 @Override | 29 @Override |
| 17 return new double [] { | 36 return new double [] { |
| 18 Math.log(x + parameters[1]), | 37 Math.log(x + parameters[1]), |
| 19 parameters[0]/(x + parameters[0]) | 38 parameters[0]/(x + parameters[0]) |
| 20 }; | 39 }; |
| 21 } | 40 } |
| 41 | |
| 42 @Override | |
| 43 public Derivative getDerivative() { | |
| 44 return DERIVATIVE; | |
| 45 } | |
| 22 } | 46 } |
| 23 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : | 47 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |