On Wed 2008-08-27 16:42, Matthew Knepley wrote: > Just so I can remove this from my todo mail pile, it appears Barry is > doing this. > The actually Schur stuff is a new KSP thing so we do not link Mat to KSP, but > it should work as you want.
I noticed this going in. I have something similar, though it was targeting my partially matrix-free case (Barry's is more general so I'll start using it). My rambling was more about attaching an auxiliary matrix which the preconditioner uses to precondition a solve with the Schur complement. PetscObjectCompose() will work fine for this. The other direction (the preconditioner telling the assembly code to assemble this auxiliary form) is an application-specific thing. Thanks, Jed -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 197 bytes Desc: not available URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20080828/f7aecbd8/attachment.pgp>
