[petsc-users] Variatonal inequalities

[David Knezevic]

On Sat, Aug 22, 2015 at 10:29 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   David,
>
>    Currently the only way to do this without adding a lot of additional
> PETSc code is to add additional variables such that only box constraints
> appear in the final problem. For example say you have constraints   c <= Ax
> <= d then introduce new variables y = Ax and then you have the larger
> problem of unknowns (x,y) and box constrains on y with -infinity and
> +infinity constraints on x.
>


OK, that makes sense, thanks for the info!

David
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