1 MatrixXf a(2,2); 2 std::cout << "a is of size " << a.rows() << "x" << a.cols() << std::endl; 3 MatrixXf b(3,3); 4 a = b; 5 std::cout << "a is now of size " << a.rows() << "x" << a.cols() << std::endl; 6