Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Exp.java @ 2775:5016609663e2
Draw line from w-annotation to duration curve, rough version.
flys-artifacts/trunk@4514 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Fri, 25 May 2012 09:13:43 +0000 |
parents | 0dd58ab7e118 |
children | 4dda67a893da |
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package de.intevation.flys.artifacts.math.fitting; public class Exp extends Function { public Exp() { super( "exp", "W(Q) = m * a^Q + b", new String [] { "m", "a", "b" }); } @Override public double value(double x, double [] parameters) { return parameters[0]*Math.pow(parameters[1], x) + parameters[2]; } @Override public double [] gradient(double x, double [] parameters) { return new double [] { Math.pow(parameters[1], x), Math.pow(parameters[1], x-1d)*x, 1d }; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :