Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/LogLinear.java @ 9643:58f3fe98fd6b
Fitting new Option UI
| author | dnt_bjoernsen <d.tironi@bjoernsen.de> |
|---|---|
| date | Mon, 02 Dec 2019 14:14:06 +0100 |
| parents | af13ceeba52a |
| children |
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| 9642:3987fef69143 | 9643:58f3fe98fd6b |
|---|---|
| 6 * documentation coming with Dive4Elements River for details. | 6 * documentation coming with Dive4Elements River for details. |
| 7 */ | 7 */ |
| 8 | 8 |
| 9 package org.dive4elements.river.artifacts.math.fitting; | 9 package org.dive4elements.river.artifacts.math.fitting; |
| 10 | 10 |
| 11 public class LogLinear | 11 public class LogLinear extends AbstractLogLinear { |
| 12 extends Function | |
| 13 { | |
| 14 public static final Derivative DERIVATIVE = | |
| 15 new Derivative("W'(Q) = a*m/(m*Q + b)") { | |
| 16 | 12 |
| 17 @Override | |
| 18 public org.dive4elements.river.artifacts.math.Function | |
| 19 instantiate(double [] parameters) | |
| 20 { | |
| 21 final double a = parameters[0]; | |
| 22 final double m = parameters[1]; | |
| 23 final double b = parameters[2]; | |
| 24 | |
| 25 return new org.dive4elements.river.artifacts.math.Function() { | |
| 26 @Override | |
| 27 public double value(double Q) { | |
| 28 return a*m/(m*Q + b); | |
| 29 } | |
| 30 }; | |
| 31 } | |
| 32 }; | |
| 33 | 13 |
| 34 public static final Function INSTANCE = new LogLinear(); | 14 public static final Function INSTANCE = new LogLinear(); |
| 35 | 15 |
| 36 public LogLinear() { | 16 public LogLinear() { |
| 37 super( | 17 super("log-linear", "W(Q) = a*ln(m*Q + b)"); |
| 38 "log-linear", | |
| 39 "W(Q) = a*ln(m*Q + b)", | |
| 40 new String [] { "a", "m", "b" }); | |
| 41 } | |
| 42 | |
| 43 @Override | |
| 44 public double value(double x, double [] parameters) { | |
| 45 return parameters[0]*Math.log(parameters[1]*x + parameters[2]); | |
| 46 } | |
| 47 | |
| 48 @Override | |
| 49 public double [] gradient(double x, double [] parameters) { | |
| 50 double a = parameters[0]; | |
| 51 double m = parameters[1]; | |
| 52 double b = parameters[2]; | |
| 53 | |
| 54 double lin = m*x + b; | |
| 55 | |
| 56 return new double [] { | |
| 57 Math.log(lin), | |
| 58 a*x / lin, | |
| 59 a / lin | |
| 60 }; | |
| 61 } | |
| 62 | |
| 63 @Override | |
| 64 public Derivative getDerivative() { | |
| 65 return DERIVATIVE; | |
| 66 } | |
| 67 | |
| 68 @Override | |
| 69 public Function getInverse() { | |
| 70 return InvLogLinear.INSTANCE; | |
| 71 } | 18 } |
| 72 } | 19 } |
| 73 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |