[petsc-dev] quasi-newton approximations

Munson, Todd tmunson at mcs.anl.gov
Tue Aug 30 13:18:14 CDT 2016

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

Should we consider extracting some common class for these approximations and 
the associated operations or just leave them as separate things?


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