[petsc-users] routines called in LAPACK interface of SLEPc

[Jose E. Roman]

On 05/03/2012, Umut Tabak wrote:

> Dear SLEPc team,
> 
> May I kindly ask which LAPACK routines are called in the LAPACK interface of SLEPc?
> 
> And what kind of checks do you conduct to check if the matrix is symmetric or not?
> 
> I have some matrices which are not completely symmetric however the off-diagonal terms are really small(orders: 1e-16) and I used Intel MKL Lapack routines for my problems.
> 
> But, I could not get the correct eigenvectors, however I can get the correct eigenvalues on which I am puzzling with.
> 
> Best regards,
> Umut

When the problem in known to be symmetric, we symmetrize the matrix and call a symmetric Lapack subroutine such as dsyevr.

Jose