1*bf2c3715SXin Li MatrixXf mat(2,2); 2*bf2c3715SXin Li mat << 1, 2, 4, 7; 3*bf2c3715SXin Li cout << "Here is the matrix mat:\n" << mat << endl << endl; 4*bf2c3715SXin Li 5*bf2c3715SXin Li mat = 2 * mat; 6*bf2c3715SXin Li cout << "After 'mat = 2 * mat', mat = \n" << mat << endl << endl; 7*bf2c3715SXin Li 8*bf2c3715SXin Li 9*bf2c3715SXin Li mat = mat - MatrixXf::Identity(2,2); 10*bf2c3715SXin Li cout << "After the subtraction, it becomes\n" << mat << endl << endl; 11*bf2c3715SXin Li 12*bf2c3715SXin Li 13*bf2c3715SXin Li ArrayXXf arr = mat; 14*bf2c3715SXin Li arr = arr.square(); 15*bf2c3715SXin Li cout << "After squaring, it becomes\n" << arr << endl << endl; 16*bf2c3715SXin Li 17*bf2c3715SXin Li // Combining all operations in one statement: 18*bf2c3715SXin Li mat << 1, 2, 4, 7; 19*bf2c3715SXin Li mat = (2 * mat - MatrixXf::Identity(2,2)).array().square(); 20*bf2c3715SXin Li cout << "Doing everything at once yields\n" << mat << endl << endl; 21