Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/InvPow.java @ 3647:421d1b0576b8
Removed deprecated method.
flys-artifacts/trunk@5370 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
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date | Fri, 07 Sep 2012 09:10:32 +0000 |
parents | de67497de5a0 |
children |
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package de.intevation.flys.artifacts.math.fitting; public class InvPow extends Function { public static final Derivative DERIVATIVE = new Derivative("Q'(W) = ((W-d)/a)^(1/c)/(c*(W-d))") { @Override public de.intevation.flys.artifacts.math.Function instantiate(double [] parameters) { double a = parameters[0]; final double c = parameters[1]; final double d = parameters[2]; final double _1a = 1d/a; final double _1c = 1d/c; return new de.intevation.flys.artifacts.math.Function() { @Override public double value(double W) { double Wd = W-d; return Math.pow(Wd*_1a, _1c)/(c*Wd); } }; } }; public static final Function INSTANCE = new InvPow(); public InvPow() { super( "pow", "Q(W) = ((W-d)/a)^(1/c)", new String [] { "a", "c", "d" }); } @Override public double value(double W, double [] parameters) { double a = parameters[0]; double c = parameters[1]; double d = parameters[2]; return Math.pow((W-d)/a, 1d/c); } @Override public double [] gradient(double W, double [] parameters) { double a = parameters[0]; double c = parameters[1]; double d = parameters[2]; double _1c = 1d/c; double Wdac = Math.pow((W-d)/a, 1d/c); double Wd = W-d; return new double [] { -Wdac/(a*c), (Wdac*Math.log(Wd/a))/(c*c), -Wdac/(c*Wd) }; } @Override public Derivative getDerivative() { // TODO: Implement me! return null; } @Override public Function getInverse() { return Pow.INSTANCE; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :