[petsc-users] Variatonal inequalities

David Knezevic david.knezevic at akselos.com
Sun Aug 23 09:29:01 CDT 2015

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!

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