1 #include <Eigen/Core> 2 #include <iostream> 3 4 using namespace Eigen; 5 using namespace std; 6 main(void)7int main(void) 8 { 9 int const N = 5; 10 MatrixXi A(N,N); 11 A.setRandom(); 12 cout << "A =\n" << A << '\n' << endl; 13 cout << "A(:,1..3) =\n" << A.middleCols<3>(1) << endl; 14 return 0; 15 } 16