Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java @ 5838:5aa05a7a34b7

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Rename modules to more fitting names.
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 15:23:37 +0200
parents flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java@bd047b71ab37
children 4897a58c8746
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
parents: 3177
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class InvLinear
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4 extends Function
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5 {
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6 public static Function INSTANCE = new InvLinear();
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7
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8 public static final Derivative DERIVATIVE =
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9 new Derivative("Q'(W) = 1/m") {
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10
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11 @Override
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12 public org.dive4elements.river.artifacts.math.Function
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13 instantiate(double [] parameters)
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14 {
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15 final double _1m = 1d/parameters[0];
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16
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bd047b71ab37 Repaired internal references
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parents: 3177
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17 return new org.dive4elements.river.artifacts.math.Function() {
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18 @Override
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19 public double value(double Q) {
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20 return _1m;
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21 }
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22 };
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23 }
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24 };
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25
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26 public InvLinear() {
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27 super("inv-linear", "W(Q) = (Q-b)/m", new String [] { "m", "b" });
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28 }
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29
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30 @Override
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31 public double value(double Q, double [] parameters) {
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32 double m = parameters[0];
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33 double b = parameters[1];
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34 return (Q-b)/m;
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35 }
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36
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37 @Override
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38 public double [] gradient(double Q, double [] parameters) {
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39 double m = parameters[0];
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40 double b = parameters[1];
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41 return new double [] {
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42 -(Q-b)/(m*m),
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43 -1d/m
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44 };
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45 }
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46
585c0b49e696 Added inverses of the fitting functions.
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47 @Override
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48 public Derivative getDerivative() {
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49 return DERIVATIVE;
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50 }
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51
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52 @Override
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53 public Function getInverse() {
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54 return Linear.INSTANCE;
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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