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