[petsc-users] Finite difference approximation of Jacobian

Matthew Knepley knepley at gmail.com
Sat Dec 11 15:28:33 CST 2021

On Sat, Dec 11, 2021 at 1:58 PM Tang, Qi <tangqi at msu.edu> wrote:

> Hi,
> Does anyone have comment on finite difference coloring with DMStag? We are
> using DMStag and TS to evolve some nonlinear equations implicitly. It would
> be helpful to have the coloring Jacobian option with that.

Since DMStag produces the Jacobian connectivity, you can
use -snes_fd_color_use_mat. It has many options. Here is an example of us
using that:




> Thanks,
> Qi
> On Oct 15, 2021, at 3:07 PM, Jorti, Zakariae via petsc-users <
> petsc-users at mcs.anl.gov> wrote:
> Hello,
> Does the Jacobian approximation using coloring and finite differencing of
> the function evaluation work in DMStag?
> Thank you.
> Best regards,
> Zakariae

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
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