[petsc-users] How to decompose and record a constant A

[Mark Adams]

PETSc solvers will cache any setup computations, like a matrix
factorization, and will reuse them on subsequent solves.

If you call KSPSetOperators, PETSc will assume its cache is invalid and
redo any required setup on subsequent solves.

Mark

On Tue, Apr 9, 2019 at 4:08 AM ztdepyahoo via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Dear group:
>       I need to solve a Laplacian problem Ax=b every time step where A is
> a constant . I want to store the inverse of A at the first time step.
> how to do with Petsc
>  Regards
>
> ztdepyahoo
> ztdepyahoo at gmail.com
>
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