1*bf2c3715SXin Li MatrixXi m(3, 3); 2*bf2c3715SXin Li m << 1, 2, 3, 3*bf2c3715SXin Li 4, 5, 6, 4*bf2c3715SXin Li 7, 8, 9; 5*bf2c3715SXin Li m = (m.array() >= 5).select(-m, m); 6*bf2c3715SXin Li cout << m << endl; 7