Mercurial > dive4elements > river
annotate flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/InvExp.java @ 3785:a5f65e8983be
Merged revisions 5501-5502,5504-5508,5511-5513,5516-5519 via svnmerge from
file:///home/clients/bsh/bsh-generischer-viewer/Material/SVN/flys-artifacts/trunk
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r5501 | felix | 2012-09-18 11:49:45 +0200 (Di, 18 Sep 2012) | 1 line
fix issue865 - missing showarea theme prop.
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r5502 | clins | 2012-09-18 12:18:30 +0200 (Di, 18 Sep 2012) | 1 line
Add robustness checks to prevent NPEs
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r5504 | felix | 2012-09-18 14:03:15 +0200 (Di, 18 Sep 2012) | 1 line
i18n for area label (fix issue487).
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r5505 | clins | 2012-09-18 16:19:59 +0200 (Di, 18 Sep 2012) | 1 line
Update themes to show point descriptions
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r5506 | rrenkert | 2012-09-18 17:00:30 +0200 (Di, 18 Sep 2012) | 3 lines
Removed incorrect characteristic diameter.
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r5507 | rrenkert | 2012-09-18 17:03:20 +0200 (Di, 18 Sep 2012) | 3 lines
Fixed some stupid bugs in bed quality data factory and calculation.
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r5508 | teichmann | 2012-09-18 17:45:49 +0200 (Di, 18 Sep 2012) | 1 line
The usual whitespace and import cleanups.
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r5511 | teichmann | 2012-09-18 18:24:51 +0200 (Di, 18 Sep 2012) | 1 line
Use generics aware Collections.emptyList().
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r5512 | teichmann | 2012-09-18 20:36:52 +0200 (Di, 18 Sep 2012) | 1 line
Some more little steps towards "Auslagerung extremer Wasserspiegellagen".
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r5513 | clins | 2012-09-18 23:38:19 +0200 (Di, 18 Sep 2012) | 1 line
A and B facets of fix analyis are now deactivated by default
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r5516 | bricks | 2012-09-19 10:45:51 +0200 (Mi, 19 Sep 2012) | 2 lines
Add the gauge station to the GaugeOverviewInfoService xml response
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r5517 | rrenkert | 2012-09-19 10:50:23 +0200 (Mi, 19 Sep 2012) | 3 lines
Added CSV export to bed quality calculation.
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r5518 | bricks | 2012-09-19 11:04:04 +0200 (Mi, 19 Sep 2012) | 2 lines
Fix date in changelog entry
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r5519 | teichmann | 2012-09-19 11:17:14 +0200 (Mi, 19 Sep 2012) | 1 line
Removed trailing whitespace.
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flys-artifacts/tags/2.9.1@5531 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Wed, 19 Sep 2012 14:58:31 +0000 |
parents | 585c0b49e696 |
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Added inverses of the fitting functions.
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parents:
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1 package de.intevation.flys.artifacts.math.fitting; |
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2 |
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3 public class InvExp |
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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) = 1/(log(a)*(Q-b))") { |
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8 |
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9 @Override |
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10 public de.intevation.flys.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[1]; |
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14 final double b = parameters[2]; |
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15 final double loga = Math.log(a); |
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16 |
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17 return new de.intevation.flys.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 1d/(loga*(Q-a)); |
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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 static final Function INSTANCE = new InvExp(); |
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27 |
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28 public InvExp() { |
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29 super( |
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30 "inv-exp", |
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31 "Q(W) = log((W-b)/m)/log(a)", |
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32 new String [] { "m", "a", "b" }); |
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33 } |
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34 |
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35 @Override |
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36 public double value(double W, double [] parameters) { |
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37 double m = parameters[0]; |
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38 double a = parameters[1]; |
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39 double b = parameters[2]; |
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40 return Math.log((W-b)/m)/Math.log(a); |
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41 } |
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42 |
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43 @Override |
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44 public double [] gradient(double Q, double [] parameters) { |
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45 double m = parameters[0]; |
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parents:
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46 double a = parameters[1]; |
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47 double b = parameters[2]; |
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48 double loga = Math.log(a); |
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49 return new double [] { |
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50 -1d/(loga*m), |
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51 -Math.log((Q-b)/m)/(a*loga*loga), |
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52 -1d/(loga*(Q-b)) |
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53 }; |
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54 } |
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55 |
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56 @Override |
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57 public Derivative getDerivative() { |
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58 return DERIVATIVE; |
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59 } |
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60 |
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61 @Override |
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62 public Function getInverse() { |
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63 return Exp.INSTANCE; |
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64 } |
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65 } |
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66 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |