Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java @ 376:d8f3ef441bf2
merged gnv-artifacts/0.3
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:47 +0200 |
| parents | 25e4724aa504 |
| children | 828df3ddb758 |
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| 293:6b0ef2324d02 | 376:d8f3ef441bf2 |
|---|---|
| 1 package de.intevation.gnv.math; | |
| 2 | |
| 3 import org.apache.commons.math.optimization.fitting.ParametricRealFunction; | |
| 4 | |
| 5 import org.apache.commons.math.FunctionEvaluationException; | |
| 6 | |
| 7 /** | |
| 8 * @author Sascha L. Teichmann | |
| 9 */ | |
| 10 public class LinearFunction | |
| 11 implements ParametricRealFunction | |
| 12 { | |
| 13 public static final LinearFunction INSTANCE = new LinearFunction(); | |
| 14 | |
| 15 public LinearFunction() { | |
| 16 } | |
| 17 | |
| 18 public double value(double x, double [] parameters) | |
| 19 throws FunctionEvaluationException | |
| 20 { | |
| 21 return x*parameters[0] + parameters[1]; | |
| 22 } | |
| 23 | |
| 24 public double [] gradient(double x, double [] parameters) | |
| 25 throws FunctionEvaluationException | |
| 26 { | |
| 27 return new double [] { x, 1f }; | |
| 28 } | |
| 29 } | |
| 30 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |