matrix_item_t matrix_t::get_matrix_item(matrix_inx_t i,matrix_inx_t j)
{
	matrix_item_t tmp;
	if (traspuesta_ == true){
		tmp = M_[pos(i,j)];
		M_[pos(i,j)] = M_[pos(j,i)];
		M_[pos(j,i)] = tmp;
	}
	else
		return M_[pos(i,j)];
}