Mercurial > dive4elements > river
view flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/InvLinear.java @ 5798:febeb4bb10a5
StaticWQKmsArtifact: implement WaterLineArtifact .
author | Felix Wolfsteller <felix.wolfsteller@intevation.de> |
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date | Wed, 24 Apr 2013 08:21:52 +0200 |
parents | 585c0b49e696 |
children |
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package de.intevation.flys.artifacts.math.fitting; public class InvLinear extends Function { public static Function INSTANCE = new InvLinear(); public static final Derivative DERIVATIVE = new Derivative("Q'(W) = 1/m") { @Override public de.intevation.flys.artifacts.math.Function instantiate(double [] parameters) { final double _1m = 1d/parameters[0]; return new de.intevation.flys.artifacts.math.Function() { @Override public double value(double Q) { return _1m; } }; } }; public InvLinear() { super("inv-linear", "W(Q) = (Q-b)/m", new String [] { "m", "b" }); } @Override public double value(double Q, double [] parameters) { double m = parameters[0]; double b = parameters[1]; return (Q-b)/m; } @Override public double [] gradient(double Q, double [] parameters) { double m = parameters[0]; double b = parameters[1]; return new double [] { -(Q-b)/(m*m), -1d/m }; } @Override public Derivative getDerivative() { return DERIVATIVE; } @Override public Function getInverse() { return Linear.INSTANCE; } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :