#include <boost/numeric/ublas/matrix_sparse.hpp>
#include <boost/numeric/ublas/io.hpp>
 
 
int main () {
	using namespace boost::numeric::ublas;
	mapped_matrix<std::complex<double> > m (3, 3);

	for (unsigned i = 0; i < m.size1 (); ++ i) {
		for (unsigned j = 0; j < i; ++ j) {
			m (i, j) = std::complex<double> (3 * i + j, 3 * i + j);
		}
		m (i, i) = std::complex<double> (4 * i, 0);
	}
	std::complex<double> tmp(m(0,0));
	std::cout <<tmp.real()<< std::endl;
	std::cout <<std::complex<double>(m(0,0)).real()<< std::endl;
}