Mercurial > dive4elements > river
view artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java @ 5838:5aa05a7a34b7
Rename modules to more fitting names.
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Thu, 25 Apr 2013 15:23:37 +0200 |
parents | flys-artifacts/src/main/java/org/dive4elements/river/artifacts/math/fitting/InvLinear.java@bd047b71ab37 |
children | 4897a58c8746 |
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package org.dive4elements.river.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 org.dive4elements.river.artifacts.math.Function instantiate(double [] parameters) { final double _1m = 1d/parameters[0]; return new org.dive4elements.river.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 :