text: #include <iostream>
  #include <Eigen/Dense>
  
  using namespace Eigen;
  using namespace std;
  
  int main()
  {
    Matrix3f m = Matrix3f::Random();
    m = (m + Matrix3f::Constant(1.2)) * 50;
    cout << "m =" << endl << m << endl;
    Vector3f v(1,2,3);
    
    cout << "m * v =" << endl << m * v << endl;
  }
  