[petsc-users] Does PETSc have these solvers bounded-constrained optimization problems?

[Justin Chang]

Hi all,

Does PETSc currently have any of these solvers for bounded constraint
problems:

1) Semismooth Newton methods (aka primal-dual active-set methods)
2) Projected Newton methods

Trilinos' Rapid Optimization Library (ROL
<https://trilinos.org/packages/rol/rol-documentation/>) has them, and I
have seen papers and books claiming that these solvers are state-of-the-art.

I see there's SNESVINEWTONSSLS
<http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/SNES/SNESVINEWTONSSLS.html>
and TAOGPCG
<http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Tao/TAOGPCG.html>
but are these the same as the above methods?

Thanks,
Justin
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