> How does one precondition a system like that? Presumably, the user may at
> best be able to provide a preconditioner for JF.
>
> If JF responds well to multigrid, then it may be possible to use AMG-KKT
> to coarsen the constraint Hessian, but how does MG perform for the sum
> JF + Hc? There i
On Wed, Aug 1, 2012 at 5:01 PM, Todd Munson wrote:
>
> On Aug 1, 2012, at 4:13 PM, Jed Brown wrote:
>
> > On Wed, Aug 1, 2012 at 11:10 AM, Todd Munson
> wrote:
> >
> > Yes, I am all in favor of actually specifying a VI externally and then
> > internally formulating the appropriate augmented syst
On Aug 1, 2012, at 4:13 PM, Jed Brown wrote:
> On Wed, Aug 1, 2012 at 11:10 AM, Todd Munson wrote:
>
> Yes, I am all in favor of actually specifying a VI externally and then
> internally formulating the appropriate augmented system. This is what
> I do in other contexts (i.e. PATH for GAMS/AMP
On Wed, Aug 1, 2012 at 11:10 AM, Todd Munson wrote:
>
> Yes, I am all in favor of actually specifying a VI externally and then
> internally formulating the appropriate augmented system. This is what
> I do in other contexts (i.e. PATH for GAMS/AMPL). Some things you
> probably want to do with s
Yes, I am all in favor of actually specifying a VI externally and then
internally formulating the appropriate augmented system. This is what
I do in other contexts (i.e. PATH for GAMS/AMPL). Some things you
probably want to do with such an interface is differentiate between
linear and nonlinea
On Tue, Jul 31, 2012 at 5:38 AM, Todd Munson wrote:
> Knowing the constraint structure and forming the augmented system is fine
> and can be
> helpful information to know when determining the active set. I would
> concentrate on
> linear constraints and inequalities though; they are nicer to dea
On Jul 31, 2012, at 2:36 AM, Jed Brown wrote:
> On Mon, Jul 30, 2012 at 5:40 PM, Todd Munson wrote:
> > 1. change SNESVI to support general complementarity constraints because
> > only doing box constraints on state variables is lame
>
> Okay; and how do you want to do this? You need to write
On Mon, Jul 30, 2012 at 5:40 PM, Todd Munson wrote:
> > 1. change SNESVI to support general complementarity constraints because
> only doing box constraints on state variables is lame
>
> Okay; and how do you want to do this? You need to write out the
> corresponding KT system
> and then you jus
> 1. change SNESVI to support general complementarity constraints because only
> doing box constraints on state variables is lame
Okay; and how do you want to do this? You need to write out the corresponding
KT system
and then you just have a box constrained problem. One can make it easier to
I think we should:
1. change SNESVI to support general complementarity constraints because
only doing box constraints on state variables is lame
2. have a mode to solve the system in the full space, instead of
eliminating the semi-smooth variables (which produces the bad conditioning)
3. eventua
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