[Cbc] Open Solver Issue

[Conni Pennock]

UNSUBSCRIBE ME PLEASE!!!!!!!!!!!!​

On Mon, Oct 10, 2016 at 6:59 AM, Ted Ralphs <ted at lehigh.edu> wrote:

> Hi Tom,
>
> This is is a question for the Open Solver team. If I understand well, I
> don't think it has anything to do with Cbc as a stand-alone solver. I have
> cc'd Andrew Mason, who can direct you better where to post your question,
> but I think there are forums on the Open Solver site that would be a beter
> place to go. Thanks!
>
> Cheers,
>
> Ted
>
> On Thu, Oct 6, 2016 at 5:34 PM, Favinger, Thomas E CIV USARMY AMSAA (US) <
> thomas.e.favinger.civ at mail.mil> wrote:
>
>> ALCON,
>>
>> I am having the following issue with Open Solver.  Please refer to the
>> attached PowerPoint file.  As shown on Slide 1, I created an extremely
>> simple linear problem.  If I choose the Bonmin solver and run the model,
>> the
>> result shown on Slide 2 occurs.  As shown on Slide 3, if I try to select
>> the
>> CBC Linear Solver, then I get the error message shown on Slide 4.
>> Clicking
>> Debug leads to the result shown on Slide 5.  The Case statement does not
>> recognize "Cbc" because it appears to be looking for "CBC".  I have been
>> able to trace the code to the function GetNameValueIfExists (see Slide 6).
>> The HasRef value appears to be coming up False.  Eventually, the statement
>> value = Mid(s, 3, Len(s) - 3) seems to set value to "Cbc".  By adding the
>> If
>> statement to the bottom of the function, I can actually force it to return
>> "CBC" which stops the error from occurring and allows the CBC Solver to
>> work
>> (Slides 7 and 8).  It is not obvious to me why GetNameValueIfExists fails
>> to
>> return "CBC" without being hacked, but perhaps those of you who live and
>> breathe the Open Solver software would have an idea?
>>
>> Tom Favinger
>> US AMSAA
>> 410-278-4310
>>
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>>
>>
>
>
> --
> Dr. Ted Ralphs
> Professor, Lehigh University
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted
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