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#include <Eigen/Dense>
#include <iostream>
using namespace std;
using namespace Eigen;
int main()
{
MatrixXf m(4,4);
m << 1, 2, 3, 4,
5, 6, 7, 8,
9, 10,11,12,
13,14,15,16;
//print first two columns
cout << "-- leftCols(2) --" << endl
<< m.leftCols(2) << endl << endl;
//print last two rows
cout << "-- bottomRows(2) --" << endl
<< m.bottomRows(2) << endl << endl;
//print top-left 2x3 corner
cout << "-- topLeftCorner(2,3) --" << endl
<< m.topLeftCorner(2,3) << endl;
}
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