1*bf2c3715SXin Li Matrix3d m = Matrix3d::Random(); 2*bf2c3715SXin Li cout << "Here is the matrix m:" << endl << m << endl; 3*bf2c3715SXin Li cout << "Here is the sum of each column:" << endl << m.colwise().sum() << endl; 4*bf2c3715SXin Li cout << "Here is the maximum absolute value of each column:" 5*bf2c3715SXin Li << endl << m.cwiseAbs().colwise().maxCoeff() << endl; 6