Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java @ 9646:0380717105ba
Implemented alternative fitting strategy for Log-Linear function.
author | Gernot Belger <g.belger@bjoernsen.de> |
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date | Mon, 02 Dec 2019 17:56:15 +0100 |
parents | af13ceeba52a |
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rev | line source |
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1 /* Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde |
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2 * Software engineering by Intevation GmbH |
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3 * |
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4 * This file is Free Software under the GNU AGPL (>=v3) |
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5 * and comes with ABSOLUTELY NO WARRANTY! Check out the |
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6 * documentation coming with Dive4Elements River for details. |
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7 */ |
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8 |
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9 package org.dive4elements.river.artifacts.math.fitting; |
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10 |
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11 public class InvLinear |
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12 extends Function |
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13 { |
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14 public static Function INSTANCE = new InvLinear(); |
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15 |
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16 public static final Derivative DERIVATIVE = |
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17 new Derivative("Q'(W) = 1/m") { |
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18 |
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19 @Override |
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20 public org.dive4elements.river.artifacts.math.Function |
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21 instantiate(double [] parameters) |
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22 { |
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23 final double _1m = 1d/parameters[0]; |
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24 |
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25 return new org.dive4elements.river.artifacts.math.Function() { |
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26 @Override |
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27 public double value(double Q) { |
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28 return _1m; |
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29 } |
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30 }; |
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31 } |
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32 }; |
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33 |
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34 public InvLinear() { |
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35 super("inv-linear", "W(Q) = (Q-b)/m", new String [] { "m", "b" }); |
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36 } |
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37 |
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38 @Override |
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39 public double value(double Q, double [] parameters) { |
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40 double m = parameters[0]; |
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41 double b = parameters[1]; |
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42 return (Q-b)/m; |
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43 } |
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44 |
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45 @Override |
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46 public double [] gradient(double Q, double [] parameters) { |
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47 double m = parameters[0]; |
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48 double b = parameters[1]; |
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49 return new double [] { |
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50 -(Q-b)/(m*m), |
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51 -1d/m |
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52 }; |
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53 } |
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54 |
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55 @Override |
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56 public Derivative getDerivative() { |
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57 return DERIVATIVE; |
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58 } |
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59 |
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60 @Override |
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61 public Function getInverse() { |
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62 return Linear.INSTANCE; |
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63 } |
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64 } |
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65 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |