Mercurial > dive4elements > river
annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvSQPow.java @ 9802:a9641367812c 3.2.x tip
Improve locale support in artifacts container
Makes it easier to run scripts e.g. for importing data.
author | Tom Gottfried <tom@intevation.de> |
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date | Wed, 29 May 2024 10:51:00 +0200 |
parents | af13ceeba52a |
children | 58f3fe98fd6b |
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 InvSQPow |
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12 extends Function |
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13 { |
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14 public static final Derivative DERIVATIVE = |
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15 new Derivative("Q'(S) = (S/a)^(1/b)/(b*S)") { |
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16 |
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17 @Override |
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18 public org.dive4elements.river.artifacts.math.Function |
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19 instantiate(double [] parameters) |
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20 { |
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21 final double _1a = 1d/parameters[0]; |
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22 final double b = parameters[1]; |
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23 final double _1b = 1d/b; |
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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 S) { |
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28 return Math.pow(S*_1a, _1b)/(b*S); |
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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 public static final Function INSTANCE = new InvSQPow(); |
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34 |
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35 public InvSQPow() { |
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36 super( |
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37 "inv-sq-pow", |
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38 "Q(S) = Q=(S/a)^(1/b)", |
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39 new String [] { "a", "b" }); |
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40 } |
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41 |
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42 @Override |
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43 public double value(double S, double [] parameters) { |
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44 double a = parameters[0]; |
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45 double b = parameters[1]; |
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46 return Math.pow(S/a, 1d/b); |
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47 } |
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48 |
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49 @Override |
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50 public double [] gradient(double S, double [] parameters) { |
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51 double a = parameters[0]; |
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52 double b = parameters[1]; |
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53 double Sa = S/a; |
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54 double _1b = 1d/b; |
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55 double eSa1b = Math.pow(Sa, _1b); |
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56 return new double [] { |
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57 -eSa1b/(a*b), |
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58 -(eSa1b*Math.log(Sa))/(b*b) |
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59 }; |
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60 } |
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61 |
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62 @Override |
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63 public Derivative getDerivative() { |
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64 return DERIVATIVE; |
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65 } |
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66 |
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67 @Override |
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68 public Function getInverse() { |
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69 return SQPow.INSTANCE; |
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70 } |
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71 } |
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72 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |