Why not just put zeros in the composite non-zero pattern before you assemble it the first time? Then call MatZeroEntries whenever you want to reassemble.
On Thu, Mar 14, 2013 at 1:28 PM, Sanjay Govindjee <s_g at berkeley.edu> wrote: > Is there a mechanism for resetting a matrix's non-zero pattern? > > In particular, I have a preallocated a matrix, set the values, and > assembled it. > And used it to solve a problem. > > Now I would like to zero it, and reassemble it with a different non-zero > pattern. > Note the matrix has been preallocated so that it can accommodate both > non-zero > patterns. > > -sanjay > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20130314/2f9f185e/attachment.html>
