Mercurial > dive4elements > river

annotate artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/SQPow.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/SQPow.java@bd047b71ab37
children 4897a58c8746
rev   line source
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bd047b71ab37 Repaired internal references
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1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class SQPow
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4 extends Function
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5 {
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6 public static final Derivative DERIVATIVE =
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7 new Derivative("S'(Q) = a*b*Q^(b-1)") {
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8
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9 @Override
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10 public org.dive4elements.river.artifacts.math.Function
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11 instantiate(double [] parameters)
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12 {
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13 final double a = parameters[0];
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14 final double b = parameters[1];
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15
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16 return new org.dive4elements.river.artifacts.math.Function() {
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17 @Override
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18 public double value(double Q) {
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19 return a*b*Math.pow(Q, b-1);
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20 }
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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 public static final Function INSTANCE = new SQPow();
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26
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27 public SQPow() {
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28 super(
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29 "sq-pow",
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30 "S(Q) = a*Q^b",
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31 new String [] { "a", "b" });
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32 }
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33
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34 @Override
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35 public double value(double x, double [] parameters) {
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36 return parameters[0]*Math.pow(x, parameters[1]);
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37 }
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38
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39 @Override
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40 public double [] gradient(double q, double [] parameters) {
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41 double a = parameters[0];
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42 double b = parameters[1];
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43 double q_b = Math.pow(q, b);
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44 return new double [] {
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45 q_b,
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46 a*q_b*Math.log(q),
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47 };
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48 }
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49
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50 @Override
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51 public Derivative getDerivative() {
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52 return DERIVATIVE;
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53 }
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54
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55 @Override
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56 public Function getInverse() {
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57 return InvSQPow.INSTANCE;
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58 }
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59 }
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60 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org