[Coin-discuss] GMPL support in COIN-OR

[Michal Kaut]

This is not correct. With glpsol (the GLPK stand-alone solver), I can 
display the solution (and other things) as I like, using display or 
printf commands that come after the solve command in the .mod file. It 
works just fine.

In both CBC and Symphony, these commands seem to be simply ignored.

Regards,
Michal

Hart, William E wrote:
> Michal:
> 
> I ran across this same issue several years ago when using GLPK directly.  I'm pretty sure that this is a limitation of GMPL, and not the interface of CBC or Symphony to it.
> 
> I'm pretty sure that I didn't have a satisfactory work-around for this, but I didn't try to work directly with the GLPK developers to resolve this issue.
> 
> --Bill
> 
> 
>> -----Original Message-----
>> From: coin-discuss-bounces at list.coin-or.org
>> [mailto:coin-discuss-bounces at list.coin-or.org] On Behalf Of
>> Michal Kaut
>> Sent: Thursday, October 09, 2008 6:53 AM
>> To: Discussions about open source software for Operations Research
>> Subject: [Coin-discuss] GMPL support in COIN-OR
>>
>> I have tried using the GMPL (GNU Math Prog Language) input
>> format with CBC and Symphony and it looks like it won't
>> process any "printf"
>> commands that come after the "solve;" command -- while
>> "printf" before the "solve" are processed correctly. Note
>> that I am speaking about the command-line executables,
>> invoked respectively as cbc model.mod%model.dat symphony -F
>> model.mod -D model.dat
>>
>> In both cases, I have used the latest stable version from the
>> SVN and compiled it using on Windows XP using MSYS/MinGW with
>> gcc 4.3.0.
>>
>> Is this a build problem on my side, or is it the way things
>> are? And if the latter, are there any plans to support also
>> the processing of results in a (near) future? And for now,
>> what is the best way of accessing the solution? Symphony at
>> least prints out all the non-zero elements using the variable
>> names and indices from the .mod file, but what about CBC?
>>
>> (From my point of view, without a user-defined output most of
>> the advantage of using a modelling language goes away...)
>>
>>
>> Thanks,
>> Michal
>>
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>>
>