[petsc-users] A flag for FormFunction.

Jed Brown jed at 59A2.org
Thu Jan 14 11:18:51 CST 2010

On Thu, 14 Jan 2010 10:49:11 -0600, Barry Smith <bsmith at mcs.anl.gov> wrote:
>     Does this handle all situations you are thinking of?

This is definitely the right thing for my example.  The other case would
be -snes_mf_operator where part of the preconditioner is cached while
evaluating F.  But this is also not a big deal, since again, the user can

  if (flg) MatMFFDSetFunction(A,FormFunctionNoCache,ctx);

Doing something different based on the call stack is a really bad thing,
I don't think FormFunction should be allowed to find out, just that any
cases that seem to call for it should have an alternate mechanism (which
they do).


More information about the petsc-users mailing list