1 MatrixXcd X = MatrixXcd::Random(4,4); 2 MatrixXcd A = X + X.adjoint(); 3 cout << "Here is a random self-adjoint 4x4 matrix:" << endl << A << endl << endl; 4 5 Tridiagonalization<MatrixXcd> triOfA(A); 6 MatrixXd T = triOfA.matrixT(); 7 cout << "The tridiagonal matrix T is:" << endl << T << endl << endl; 8 9 cout << "We can also extract the diagonals of T directly ..." << endl; 10 VectorXd diag = triOfA.diagonal(); 11 cout << "The diagonal is:" << endl << diag << endl; 12 VectorXd subdiag = triOfA.subDiagonal(); 13 cout << "The subdiagonal is:" << endl << subdiag << endl; 14