Re: lp/mip preprocessor api

Hi Heinrich,

> 
> the API should allow the user to add his own simplifications.
> 
> This may require access to the npp internal structure.

It would be problematic. I only plan to include a set of preprocessing
operations sufficient in most cases (at least for LP). On the other
hand, if the user needs to perform his own preprocessing, why not to do
that independently on the glpk preprocessor?

> 
> It would be great if the variable mapping could be applied forward and
> reverse in the MIP callback hook.

Could you provide an example of what you mean?


Best regards,

Andrew Makhorin