FastDeploy/third_party/eigen/doc/snippets/MatrixBase_diagonal_int.cpp

Matrix4i m = Matrix4i::Random();
cout << "Here is the matrix m:" << endl << m << endl;
cout << "Here are the coefficients on the 1st super-diagonal and 2nd "
        "sub-diagonal of m:"
     << endl
     << m.diagonal(1).transpose() << endl
     << m.diagonal(-2).transpose() << endl;