[petsc-users] Question about KSP

Jed Brown jed at jedbrown.org
Thu May 26 10:38:20 CDT 2016

Elias Karabelas <elias.karabelas at medunigraz.at> writes:

> I have a question about preconditioned solvers. So, I have a 
> Sparsematrix, say A, and now for some reason I would like to add some 
> rank-one term u v^T to that matrix.

You can use Sherman-Morrison/Woodbury, but it costs an extra
preconditioner application and Krylov with the old preconditioner
converges in one extra iteration, so it's a wash.  You might prefer it
for repeated solves though.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 818 bytes
Desc: not available
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20160526/4e4d8c35/attachment.pgp>

More information about the petsc-users mailing list