Hello, KSP_PCApply I found the the above function used in KSPSolve_CG but couldn't find its documentation. I will appreciate any help in this direction. thanks Bibrak -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120217/6c9dac3b/attachment.htm>