Mercurial > dive4elements > river

annotate flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/Quad.java @ 5831:bd047b71ab37

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Repaired internal references
author Sascha L. Teichmann <teichmann@intevation.de>
date Thu, 25 Apr 2013 12:06:39 +0200
parents flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Quad.java@de67497de5a0
children
rev   line source
5831
bd047b71ab37 Repaired internal references
Sascha L. Teichmann <teichmann@intevation.de>
parents: 3181
diff changeset
1 package org.dive4elements.river.artifacts.math.fitting;
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2
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3 public class Quad
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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("W'(Q) = 2*n*Q+m") {
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8
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9 @Override
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bd047b71ab37 Repaired internal references
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parents: 3181
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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 n2 = 2d*parameters[0];
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14 final double m = parameters[1];
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parents: 2569
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15
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bd047b71ab37 Repaired internal references
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parents: 3181
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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 n2*Q+m;
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parents: 2569
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20 }
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parents: 2569
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21 };
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parents: 2569
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22 }
4dda67a893da FixA: Added the derivatives of all fitting functions.
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parents: 2569
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23 };
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24
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59b14bc676ec Fitting: Link the functions to there inverses via getInverse().
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25 public static final Function INSTANCE = new Quad();
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26
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27 public Quad() {
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28 super(
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parents:
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29 "quad",
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parents:
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30 "W(Q) = n*Q^2 + m*Q + b",
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31 new String [] { "n", "m", "b" });
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32 }
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parents:
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33
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parents:
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34 @Override
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parents:
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35 public double value(double x, double [] parameters) {
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36 // n*Q^2 + m*Q + b <=> Q*(n*Q + m) + b
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parents:
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37 return x*(parameters[0]*x + parameters[1]) + parameters[2];
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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38 }
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parents:
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39
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parents:
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40 @Override
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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41 public double [] gradient(double x, double [] parameters) {
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42 return new double [] { x*x, x, 1d };
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parents:
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43 }
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parents: 2569
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44
4dda67a893da FixA: Added the derivatives of all fitting functions.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
parents: 2569
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45 @Override
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parents: 2569
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46 public Derivative getDerivative() {
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47 return DERIVATIVE;
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parents: 2569
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48 }
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585c0b49e696 Added inverses of the fitting functions.
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49
585c0b49e696 Added inverses of the fitting functions.
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parents: 3009
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50 @Override
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51 public Function getInverse() {
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52 return InvQuad.INSTANCE;
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parents: 3009
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53 }
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parents:
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54 }
0dd58ab7e118 Added functions to be used for fitting in the "Fixierungsanalyse" and "Extremwertermittlung".
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parents:
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55 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org