Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Pow.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 | 59b14bc676ec |
children |
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package de.intevation.flys.artifacts.math.fitting; public class Pow extends Function { public static final Derivative DERIVATIVE = new Derivative("W'(Q) = a*c*Q^(c-1)") { @Override public de.intevation.flys.artifacts.math.Function instantiate(double [] parameters) { final double a = parameters[0]; final double c = parameters[1]; return new de.intevation.flys.artifacts.math.Function() { @Override public double value(double Q) { return a*c*Math.pow(Q, c-1); } }; } }; public static final Function INSTANCE = new Pow(); public Pow() { super( "pow", "W(Q) = a*Q^c + d", new String [] { "a", "c", "d" }); } @Override public double value(double x, double [] parameters) { return parameters[0]*Math.pow(x, parameters[1]) + parameters[2]; } @Override public double [] gradient(double x, double [] parameters) { double a = parameters[0]; double c = parameters[1]; double x_c = Math.pow(x, c); return new double [] { x_c, a*x_c*Math.log(x), 1d }; } @Override public Derivative getDerivative() { return DERIVATIVE; } @Override public Function getInverse() { return InvPow.INSTANCE; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :