[petsc-users] Finite difference approximation of Jacobian

[Patrick Sanan]

I will work on adding this - long overdue work from me!

Am Di., 14. Dez. 2021 um 18:34 Uhr schrieb Tang, Qi <tangqi at msu.edu>:

> Dear all,
>
> Will someone be able to help with this coloring request on dmstag in the
> next few weeks? If not, we will try to fix that on our own. We really need
> this capability for both debugging as well as performance comparison vs
> analytical Jacobian/preconditioning we implemented. Thanks.
>
> Qi
> LANL
>
>
>
> On Dec 13, 2021, at 12:26 PM, Tang, Qi <tangqi at msu.edu> wrote:
>
> “overallocating” is exactly what we can live on at the moment, as long as
> it is easier to work with coloring on dmstag.
>
> So it sounds like if we can provide a preallocated matrix with a proper
> stencil through DMCreateMatrix, then it should work with dmstag and
> coloring already. Most APIs are already there.
>
> Qi
>
>
>
> On Dec 13, 2021, at 12:13 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
> Yes, and would not handle higher order stencils.I think the
> overallocating is livable for the first imeplementation.
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20211216/268c9af9/attachment.html>