1#include <Eigen/Dense>
2#include <iostream>
3
4using namespace std;
5using namespace Eigen;
6
7int main()
8{
9  Array22f m;
10  m << 1,2,
11       3,4;
12  Array44f a = Array44f::Constant(0.6);
13  cout << "Here is the array a:" << endl << a << endl << endl;
14  a.block<2,2>(1,1) = m;
15  cout << "Here is now a with m copied into its central 2x2 block:" << endl << a << endl << endl;
16  a.block(0,0,2,3) = a.block(2,1,2,3);
17  cout << "Here is now a with bottom-right 2x3 block copied into top-left 2x2 block:" << endl << a << endl << endl;
18}
19