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      1 #include <Eigen/Core>
      2 #include <iostream>
      3 
      4 using namespace Eigen;
      5 using namespace std;
      6 
      7 int 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.middleRows<3>(1) << endl;
     14     return 0;
     15 }
     16