1#include <iostream>
2#include <Eigen/Dense>
3
4using namespace Eigen;
5
6int main()
7{
8  Matrix4d m;
9  m.resize(4,4); // no operation
10  std::cout << "The matrix m is of size "
11            << m.rows() << "x" << m.cols() << std::endl;
12}
13