1 #include <Eigen/Dense> 2 #include <iostream> 3 4 using namespace std; 5 main()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