1#include <iostream>
2#include <Eigen/Dense>
3
4using namespace Eigen;
5
6int main()
7{
8  MatrixXd m(2,5);
9  m.resize(4,3);
10  std::cout << "The matrix m is of size "
11            << m.rows() << "x" << m.cols() << std::endl;
12  std::cout << "It has " << m.size() << " coefficients" << std::endl;
13  VectorXd v(2);
14  v.resize(5);
15  std::cout << "The vector v is of size " << v.size() << std::endl;
16  std::cout << "As a matrix, v is of size "
17            << v.rows() << "x" << v.cols() << std::endl;
18}
19