[Os-project-managers] OSrL problem

[Kipp Martin]

Hi Gus:

>
> I'll have to kick this around a bit more. It ought to work, but maybe
> there is a trick somewhere. What about the following scenario: AMPL can
> have a user-defined subscript of type "binary". AMPL can only transfer
> this as an integer, so when sending such info to the solver, it
> translates false to 0 and true to 1 and sends that. And it can only
> accept integer or real values, making internal translations back into
> the original form when necessary.

I am having trouble understanding this. Are you suggesting we send 
modeling language dependent parameters to the solver interfaces?

Cheers
>
> But when the stuff comes back from the solver, can we rely on the solver
> storing it internally as integer also? I am not sure. If the solver
> sends it as boolean, I guess we can make the translation ourselves, but
> what if the solver sends it back as a string? Is that possible?
> Plausible? Something we need to worry about?
>
> There are also string-valued suffixes in AMPL, but they can have only
> finitely many values --- i.e., an enumeration --- and AMPL translates
> the enumeration into a table and sends an integer --- and it expects an
> integer corresponding to that table in return. I hope we do not end up
> having to store the enumerations at our end.
>
> Cheers
>
> gus
>
> -------------------------------------------------------
>
> Horand I. Gassmann, Professor
>
> School of Business Administration, Dalhousie University
> 6100 University Avenue, PO Box 15000
> Halifax, Nova Scotia, Canada, B3H 4R2
> ph. (902) 494-1844
> fax (902) 494-1107
>
> http://myweb.dal.ca/gassmann/
>


-- 
Kipp Martin
Professor of Operations Research
and Computing Technology
Booth School of Business
University of Chicago
5807 South Woodlawn Avenue
Chicago, IL 60637
773-702-7456
kmartin at chicagobooth.edu
http://www.chicagobooth.edu/faculty/bio.aspx?person_id=12825325568
http://projects.coin-or.org/OS

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