[petsc-users] SNESSetFunction and MatMFFDSetFunction

[Song Gao]

Dear all,

Happy new year!

I'm using the matrix-free method to solve NS equations. I call
the SNESSetFunction to set the RHS function. I think SNES also uses that
RHS function to evaluate the matrix vector product.

But I want to set one function to evaluate the residual, and another
different function to evaluate the matrix vector product. How can I do
that? Does MatMFFDSetFunction do this job?

Any suggestion is appreciated. Thank you.


Song
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