[Trilinos-Users] NOX setup question

[Neil N. Carlson]

I'm having a really hard time making sense of what I'm
getting in the Epetra_Operator argument Jac of
NOX::Epetra::Interface::Jacobian::ComputeJacobian,
specifically in the case it is an Epetra_RowMatrix.

Is its "structure" already defined on entry, and all
I'm supposed to do is redefine its values?

Is it true that this object will always be the same
object that was passed to the "J" argument of the
constructor for NOX::Epetra::LinearSystemAztecOO?
(At least when ComputeJacobian is invoked by NOX.)
Some of the NOX test/example codes seem to suggest
that, by entirely ignoring the Jac argument and
fiddling with a saved reference to the object
passed as J during setup.

Some guidance would be appreciated.

Thanks,
  Neil
-- 
Neil Carlson
Computational Physics and Methods (CCS-2)
Los Alamos National Laboratory
PO Box 1663, MS D413 · Los Alamos, NM 87545
505.665.6386 · 505.665.4972 (fax)