/* Copyright 2009-2016 David Hadka
*
* This file is part of the MOEA Framework.
*
* The MOEA Framework is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* The MOEA Framework 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the MOEA Framework. If not, see <http://www.gnu.org/licenses/>.
*/
package org.moeaframework.problem.BBOB2016;
import org.moeaframework.core.Solution;
import org.moeaframework.core.variable.EncodingUtils;
/*
* The following source code is derived from the Coco Framework available at
* <https://github.com/numbbo/coco> under the 3-clause BSD license. The
* original code is copyright 2013 by the NumBBO/CoCO team. See the AUTHORS
* file located in the Coco Framework repository for more details.
*/
/**
* The Rosenbrock function. It is not intended for this function to be used
* directly since the BBOB test suite applies additional transformations to the
* test functions.
* <p>
* Properties:
* <ul>
* <li>Partially separable
* <li>Low or moderate conditioning
* </ul>
*/
public class Rosenbrock extends BBOBFunction {
/**
* Constructs a new instance of the Rosenbrock function.
*
* @param numberOfVariables the number of decision variables
*/
public Rosenbrock(int numberOfVariables) {
super(numberOfVariables);
}
@Override
public void evaluate(Solution solution) {
double[] x = EncodingUtils.getReal(solution);
double s1 = 0.0;
double s2 = 0.0;
double tmp;
for (int i = 0; i < x.length-1; i++) {
tmp = (x[i]*x[i] - x[i+1]);
s1 += tmp*tmp;
tmp = (x[i] - 1.0);
s2 += tmp*tmp;
}
solution.setObjective(0, 100.0*s1 + s2);
}
}