Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java @ 420:c6a287398379

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Outsourcing of some methods for preparing results for chart creation. gnv-artifacts/trunk@468 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Mon, 21 Dec 2009 15:57:04 +0000
parents 25e4724aa504
children 828df3ddb758
rev   line source
357
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.gnv.math;
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2
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3 import org.apache.commons.math.optimization.fitting.ParametricRealFunction;
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4
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5 import org.apache.commons.math.FunctionEvaluationException;
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6
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7 /**
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8 * @author Sascha L. Teichmann
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9 */
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10 public class LinearFunction
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11 implements ParametricRealFunction
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12 {
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13 public static final LinearFunction INSTANCE = new LinearFunction();
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14
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15 public LinearFunction() {
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16 }
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17
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18 public double value(double x, double [] parameters)
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19 throws FunctionEvaluationException
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20 {
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21 return x*parameters[0] + parameters[1];
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22 }
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23
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24 public double [] gradient(double x, double [] parameters)
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25 throws FunctionEvaluationException
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26 {
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27 return new double [] { x, 1f };
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28 }
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29 }
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30 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org