[petsc-users] An advice on a linear system solution

Jed Brown jed at jedbrown.org
Mon Jan 12 09:51:12 CST 2015

Matthew Knepley <knepley at gmail.com> writes:
> Fieldsplit block preconditioners can be used on this type of matrix, but
> success obviously depends on the
> analytic character of the operators.  In particular, if we assume that we
> have great PCs for the diagonal,
> then B is the most important variable, and we need to know what the Schur
> complement
>    B^T  A^{-1} B or equiv B^T C^{-1} B

Matt means

  D - B^T A^{-1} B


  A - B C^{-1} B^T
-------------- 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/20150112/95ed4d92/attachment.pgp>

More information about the petsc-users mailing list