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annotate gnv-artifacts/src/main/java/de/intevation/gnv/math/LinearFunction.java @ 601:4c6d2b4df3ae

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Changes id_layer of Table layerhasparameter from literal to number. gnv-artifacts/trunk@659 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Fri, 05 Feb 2010 10:36:46 +0000
parents d9d933e06875
children 9a828e5a2390
rev   line source
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1 package de.intevation.gnv.math;
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3 import org.apache.commons.math.optimization.fitting.ParametricRealFunction;
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5 import org.apache.commons.math.FunctionEvaluationException;
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7 import org.apache.commons.math.analysis.UnivariateRealFunction;
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8
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9 /**
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10 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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11 */
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12 public class LinearFunction
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13 implements ParametricRealFunction
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14 {
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15 public static final LinearFunction INSTANCE = new LinearFunction();
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16
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17 public static class Univariate
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18 implements UnivariateRealFunction
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19 {
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20 protected double m;
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21 protected double b;
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22
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23 public Univariate() {
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24 }
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25
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26 public Univariate(double x1, double y1, double x2, double y2) {
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27 if (y1 == y2) {
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28 m = 0d;
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29 b = (x1 + x2)*0.5d;
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30 }
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31 else {
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32 m = (x1 - x2)/(y1 - y2);
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33 b = y1 - m*x1;
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34 }
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35 }
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36
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37 public double value(double x) {
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38 return m*x + b;
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39 }
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40 } // class Univariate
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41
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42 public LinearFunction() {
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43 }
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44
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45 public double value(double x, double [] parameters)
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46 throws FunctionEvaluationException
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47 {
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48 return x*parameters[0] + parameters[1];
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49 }
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50
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51 public double [] gradient(double x, double [] parameters)
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52 throws FunctionEvaluationException
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53 {
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54 return new double [] { x, 1f };
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55 }
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56 }
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57 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org