1*bf2c3715SXin Li MatrixXd X = MatrixXd::Random(5,5); 2*bf2c3715SXin Li MatrixXd A = X + X.transpose(); 3*bf2c3715SXin Li cout << "Here is a random symmetric 5x5 matrix:" << endl << A << endl << endl; 4*bf2c3715SXin Li 5*bf2c3715SXin Li VectorXd diag(5); 6*bf2c3715SXin Li VectorXd subdiag(4); 7*bf2c3715SXin Li VectorXd hcoeffs(4); // Scratch space for householder reflector. 8*bf2c3715SXin Li internal::tridiagonalization_inplace(A, diag, subdiag, hcoeffs, true); 9*bf2c3715SXin Li cout << "The orthogonal matrix Q is:" << endl << A << endl; 10*bf2c3715SXin Li cout << "The diagonal of the tridiagonal matrix T is:" << endl << diag << endl; 11*bf2c3715SXin Li cout << "The subdiagonal of the tridiagonal matrix T is:" << endl << subdiag << endl; 12