[petsc-users] Question on non-zero pattern

[John Mousel]

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
>
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