text: #include <Eigen/Dense>
  #include <iostream>
  
  using namespace Eigen;
  using namespace std;
  
  int main(int, char**)
  {
    cout.precision(3);
    Matrix3d m = Matrix3d::Random();
  cout << "Here is the matrix m:" << endl << m << endl;
  cout << "Here is the sum of each column:" << endl << m.colwise().sum() << endl;
  cout << "Here is the maximum absolute value of each column:"
       << endl << m.cwiseAbs().colwise().maxCoeff() << endl;
  
    return 0;
  }
  