Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java @ 433:828df3ddb758
Added interpolation capabilities along z axis to XYColumns.
gnv-artifacts/trunk@481 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Wed, 23 Dec 2009 12:20:25 +0000 |
| parents | 25e4724aa504 |
| children | d9d933e06875 |
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| 432:6a70e8883307 | 433:828df3ddb758 |
|---|---|
| 1 package de.intevation.gnv.math; | 1 package de.intevation.gnv.math; |
| 2 | 2 |
| 3 import org.apache.commons.math.optimization.fitting.ParametricRealFunction; | 3 import org.apache.commons.math.optimization.fitting.ParametricRealFunction; |
| 4 | 4 |
| 5 import org.apache.commons.math.FunctionEvaluationException; | 5 import org.apache.commons.math.FunctionEvaluationException; |
| 6 | |
| 7 import org.apache.commons.math.analysis.UnivariateRealFunction; | |
| 6 | 8 |
| 7 /** | 9 /** |
| 8 * @author Sascha L. Teichmann | 10 * @author Sascha L. Teichmann |
| 9 */ | 11 */ |
| 10 public class LinearFunction | 12 public class LinearFunction |
| 11 implements ParametricRealFunction | 13 implements ParametricRealFunction |
| 12 { | 14 { |
| 13 public static final LinearFunction INSTANCE = new LinearFunction(); | 15 public static final LinearFunction INSTANCE = new LinearFunction(); |
| 16 | |
| 17 public static class Univariate | |
| 18 implements UnivariateRealFunction | |
| 19 { | |
| 20 protected double m; | |
| 21 protected double b; | |
| 22 | |
| 23 public Univariate() { | |
| 24 } | |
| 25 | |
| 26 public Univariate(double x1, double y1, double x2, double y2) { | |
| 27 if (y1 == y2) { | |
| 28 m = 0d; | |
| 29 b = (x1 + x2)*0.5d; | |
| 30 } | |
| 31 else { | |
| 32 m = (x1 - x2)/(y1 - y2); | |
| 33 b = y1 - m*x1; | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 public double value(double x) { | |
| 38 return m*x + b; | |
| 39 } | |
| 40 } // class Univariate | |
| 14 | 41 |
| 15 public LinearFunction() { | 42 public LinearFunction() { |
| 16 } | 43 } |
| 17 | 44 |
| 18 public double value(double x, double [] parameters) | 45 public double value(double x, double [] parameters) |