Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java @ 5838:5aa05a7a34b7
Rename modules to more fitting names.
author | Sascha L. Teichmann <teichmann@intevation.de> |
---|---|
date | Thu, 25 Apr 2013 15:23:37 +0200 |
parents | flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java@bd047b71ab37 |
children | 4897a58c8746 |
comparison
equal
deleted
inserted
replaced
5837:d9901a08d0a6 | 5838:5aa05a7a34b7 |
---|---|
1 package org.dive4elements.river.artifacts.math.fitting; | |
2 | |
3 public class InvLinear | |
4 extends Function | |
5 { | |
6 public static Function INSTANCE = new InvLinear(); | |
7 | |
8 public static final Derivative DERIVATIVE = | |
9 new Derivative("Q'(W) = 1/m") { | |
10 | |
11 @Override | |
12 public org.dive4elements.river.artifacts.math.Function | |
13 instantiate(double [] parameters) | |
14 { | |
15 final double _1m = 1d/parameters[0]; | |
16 | |
17 return new org.dive4elements.river.artifacts.math.Function() { | |
18 @Override | |
19 public double value(double Q) { | |
20 return _1m; | |
21 } | |
22 }; | |
23 } | |
24 }; | |
25 | |
26 public InvLinear() { | |
27 super("inv-linear", "W(Q) = (Q-b)/m", new String [] { "m", "b" }); | |
28 } | |
29 | |
30 @Override | |
31 public double value(double Q, double [] parameters) { | |
32 double m = parameters[0]; | |
33 double b = parameters[1]; | |
34 return (Q-b)/m; | |
35 } | |
36 | |
37 @Override | |
38 public double [] gradient(double Q, double [] parameters) { | |
39 double m = parameters[0]; | |
40 double b = parameters[1]; | |
41 return new double [] { | |
42 -(Q-b)/(m*m), | |
43 -1d/m | |
44 }; | |
45 } | |
46 | |
47 @Override | |
48 public Derivative getDerivative() { | |
49 return DERIVATIVE; | |
50 } | |
51 | |
52 @Override | |
53 public Function getInverse() { | |
54 return Linear.INSTANCE; | |
55 } | |
56 } | |
57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |