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package de.lmu.ifi.dbs.elki.math.linearalgebra.fitting;
/*
This file is part of ELKI:
Environment for Developing KDD-Applications Supported by Index-Structures
Copyright (C) 2015
Ludwig-Maximilians-Universität München
Lehr- und Forschungseinheit für Datenbanksysteme
ELKI Development Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Interface for a function used in Levenberg-Marquard-Fitting
*
* @author Erich Schubert
*/
public interface FittingFunction {
/**
* Compute value at position x as well as gradients for the parameters
*
* @param x Current coordinate
* @param params Function parameters parameters
* @return Array consisting of y value and parameter gradients
*/
FittingFunctionResult eval(double x, double[] params);
}
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