// Viennet3.java
//
// Author:
// Antonio J. Nebro <antonio@lcc.uma.es>
// Juan J. Durillo <durillo@lcc.uma.es>
//
// Copyright (c) 2011 Antonio J. Nebro, Juan J. Durillo
//
// This program 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.
//
// 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package jmetal.problems;
import jmetal.core.Problem;
import jmetal.core.Solution;
import jmetal.encodings.solutionType.BinaryRealSolutionType;
import jmetal.encodings.solutionType.RealSolutionType;
import jmetal.util.JMException;
/**
* Class representing problem Viennet3
*/
public class Viennet3 extends Problem{
/**
* Constructor.
* Creates a default instance of the Viennet3 problem.
* @param solutionType The solution type must "Real" or "BinaryReal".
*/
public Viennet3(String solutionType) {
numberOfVariables_ = 2 ;
numberOfObjectives_ = 3 ;
numberOfConstraints_ = 0;
problemName_ = "Viennet3";
upperLimit_ = new double[numberOfVariables_];
lowerLimit_ = new double[numberOfVariables_];
for (int var = 0; var < numberOfVariables_; var++){
lowerLimit_[var] = -3.0;
upperLimit_[var] = 3.0;
} // for
if (solutionType.compareTo("BinaryReal") == 0)
solutionType_ = new BinaryRealSolutionType(this) ;
else if (solutionType.compareTo("Real") == 0)
solutionType_ = new RealSolutionType(this) ;
else {
System.out.println("Error: solution type " + solutionType + " invalid") ;
System.exit(-1) ;
}
} //Viennet3
/**
* Evaluates a solution.
* @param solution The solution to evaluate.
* @throws JMException
*/
public void evaluate(Solution solution) throws JMException {
double [] x = new double[numberOfVariables_];
double [] f = new double[numberOfObjectives_];
for (int i = 0; i < numberOfVariables_; i++)
x[i] = solution.getDecisionVariables()[i].getValue();
f[0] = 0.5 * (x[0]*x[0] + x[1]*x[1]) + Math.sin(x[0]*x[0] + x[1]*x[1]) ;
// Second function
double value1 = 3.0 * x[0] - 2.0 * x[1] + 4.0 ;
double value2 = x[0] - x[1] + 1.0 ;
f[1] = (value1 * value1)/8.0 + (value2 * value2)/27.0 + 15.0 ;
// Third function
f[2] = 1.0 / (x[0]*x[0] + x[1]*x[1]+1) - 1.1 *
Math.exp(-(x[0]*x[0])-(x[1]*x[1])) ;
for (int i = 0; i < numberOfObjectives_; i++)
solution.setObjective(i,f[i]);
} // evaluate
} // Viennet3