michalewicz.cpp

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#include <boost/math/constants/constants.hpp>
#include <cmath>

#include "../exceptions.h"
#include "../types.h"
#include "base.h"
#include "michalewicz.h"

namespace pagmo { namespace problem {


michalewicz::michalewicz(int n, int m):base(n), m_m(m) {
        // Set bounds.
        set_lb(0);
        set_ub(boost::math::constants::pi<double>()); //pi
}

base_ptr michalewicz::clone() const {
        return base_ptr(new michalewicz(*this));
}

void michalewicz::objfun_impl(fitness_vector &f, const decision_vector &x) const
{
        pagmo_assert(f.size() == 1);
        decision_vector::size_type n = x.size();
        double retval = 0.0;

        for (decision_vector::size_type i=0; i<n; i++){
                retval -= sin(x[i]) * pow(sin((i+1)*x[i]*x[i]/boost::math::constants::pi<double>()) , 2*m_m);
        }
        f[0] = retval;
}

std::string michalewicz::get_name() const
{
        return "Michalewicz";
}

}} //namespaces

BOOST_CLASS_EXPORT_IMPLEMENT(pagmo::problem::michalewicz)