nag_ddisna (f08flc) may also be used towards computing error bounds for the eigenvectors of the generalized symmetric or Hermitian definite eigenproblem. See
Golub and Van Loan (1996)
for further details on the error bounds.
The use of
nag_ddisna (f08flc) in computing error bounds for eigenvectors of the symmetric eigenvalue problem is illustrated in
Section 10 in
nag_dsyev (f08fac); its use in computing error bounds for singular vectors is illustrated in
Section 10 in
nag_dgesvd (f08kbc); and its use in computing error bounds for eigenvectors of the generalized symmetric definite eigenvalue problem is illustrated in
Section 10 in
nag_dsygv (f08sac).