Mercurial > dive4elements > river
comparison artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/AbstractLogLinear.java @ 9643:58f3fe98fd6b
Fitting new Option UI
| author | dnt_bjoernsen <d.tironi@bjoernsen.de> |
|---|---|
| date | Mon, 02 Dec 2019 14:14:06 +0100 |
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| 9642:3987fef69143 | 9643:58f3fe98fd6b |
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| 1 /** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde | |
| 2 * Software engineering by | |
| 3 * Björnsen Beratende Ingenieure GmbH | |
| 4 * Dr. Schumacher Ingenieurbüro für Wasser und Umwelt | |
| 5 * | |
| 6 * This file is Free Software under the GNU AGPL (>=v3) | |
| 7 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 8 * documentation coming with Dive4Elements River for details. | |
| 9 */ | |
| 10 package org.dive4elements.river.artifacts.math.fitting; | |
| 11 | |
| 12 /** | |
| 13 * @author Domenico Nardi Tironi | |
| 14 * | |
| 15 */ | |
| 16 /* | |
| 17 * Copyright (C) 2011, 2012, 2013 by Bundesanstalt für Gewässerkunde | |
| 18 * Software engineering by Intevation GmbH | |
| 19 * This file is Free Software under the GNU AGPL (>=v3) | |
| 20 * and comes with ABSOLUTELY NO WARRANTY! Check out the | |
| 21 * documentation coming with Dive4Elements River for details. | |
| 22 */ | |
| 23 | |
| 24 public abstract class AbstractLogLinear extends Function { | |
| 25 public static final Derivative DERIVATIVE = new Derivative("W'(Q) = a*m/(m*Q + b)") { | |
| 26 | |
| 27 @Override | |
| 28 public org.dive4elements.river.artifacts.math.Function instantiate(final double[] parameters) { | |
| 29 final double a = parameters[0]; | |
| 30 final double m = parameters[1]; | |
| 31 final double b = parameters[2]; | |
| 32 | |
| 33 return new org.dive4elements.river.artifacts.math.Function() { | |
| 34 @Override | |
| 35 public double value(final double Q) { | |
| 36 return a * m / (m * Q + b); | |
| 37 } | |
| 38 }; | |
| 39 } | |
| 40 }; | |
| 41 | |
| 42 public AbstractLogLinear(final String name, final String description) { | |
| 43 super(name, description, new String[] { "a", "m", "b" }); | |
| 44 } | |
| 45 | |
| 46 @Override | |
| 47 public final double value(final double x, final double[] parameters) { | |
| 48 return parameters[0] * Math.log(parameters[1] * x + parameters[2]); | |
| 49 } | |
| 50 | |
| 51 @Override | |
| 52 public double[] gradient(final double x, final double[] parameters) { | |
| 53 final double a = parameters[0]; | |
| 54 final double m = parameters[1]; | |
| 55 final double b = parameters[2]; | |
| 56 | |
| 57 final double lin = m * x + b; | |
| 58 | |
| 59 return new double[] { Math.log(lin), a * x / lin, a / lin }; | |
| 60 } | |
| 61 | |
| 62 @Override | |
| 63 public final Derivative getDerivative() { | |
| 64 return DERIVATIVE; | |
| 65 } | |
| 66 | |
| 67 @Override | |
| 68 public Function getInverse() { | |
| 69 return InvLogLinear.INSTANCE; | |
| 70 } | |
| 71 } | |
| 72 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |