1#include <Eigen/Dense>
2#include <iostream>
3
4using namespace std;
5
6int main()
7{
8  Eigen::Matrix4f m;
9  m << 1, 2, 3, 4,
10       5, 6, 7, 8,
11       9, 10,11,12,
12       13,14,15,16;
13  cout << "m.leftCols(2) =" << endl << m.leftCols(2) << endl << endl;
14  cout << "m.bottomRows<2>() =" << endl << m.bottomRows<2>() << endl << endl;
15  m.topLeftCorner(1,3) = m.bottomRightCorner(3,1).transpose();
16  cout << "After assignment, m = " << endl << m << endl;
17}
18