1*bf2c3715SXin Li Array44i a = Array44i::Random(); 2*bf2c3715SXin Li cout << "Here is the array a:" << endl << a << endl; 3*bf2c3715SXin Li cout << "Here is a.topRows(2):" << endl; 4*bf2c3715SXin Li cout << a.topRows(2) << endl; 5*bf2c3715SXin Li a.topRows(2).setZero(); 6*bf2c3715SXin Li cout << "Now the array a is:" << endl << a << endl; 7