[petsc-dev] quasi-newton approximations

Matthew Knepley knepley at gmail.com
Tue Aug 30 16:02:13 CDT 2016

I think we should extract them the same way as SNESMFFD. Using them as a PC
is a good idea.


On Tue, Aug 30, 2016 at 1:18 PM, Munson, Todd <tmunson at mcs.anl.gov> wrote:

> One of the common concepts for TAO and SNES is the quasi-Newton
> approximations.
> SNES seems to only use them in SNESQN (for non-symmetric matrices) and TAO
> uses
> them in TAOLMVM and TAOBLMVM (for symmetric matrices).  TOA also allows
> them to
> be used as a preconditioner for the Hessian-based line-search and
> trust-region
> methods.
> Should we consider extracting some common class for these approximations
> and
> the associated operations or just leave them as separate things?
> Todd.

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
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