[SCIP] multiple SCIP solutions in Matlab

[Gregor Hendel]

Hi Jan and list,

please note that from the SCIP command line, you would use the counter 
emphasis setting

set emphasis counter

to disable primal heuristics and separation and some other stuff that 
might ruin the counting process for you. You can specify the counter 
emphasis setting also in a settings file, e.g., scip.set, like so:

# scip.set file content
emphasis:counter

I am pretty sure that all the interfaces circulating in this discussion 
have some way to read in a settings file.

Happy solution counting,
Gregor


Am 08.12.2016 um 08:38 schrieb Matthias Miltenberger:
> Hello Jan,
>
> yes, both the Python and the Java interface support getting all 
> collected solutions:
>
> https://github.com/SCIP-Interfaces/PySCIPOpt/blob/master/pyscipopt/scip.pyx#L1212
> https://github.com/SCIP-Interfaces/JSCIPOpt/blob/master/src/scipjni.i#L131
>
> all the best
> Matthias
>
>
> On 07.12.2016 23:07, Jan Goos wrote:
>> Hello Jonathan,
>>
>> Many thanks for your swift response. For now, I’ll try and use a 
>> different approach. Nevertheless, I’d rather stay away from C. Do the 
>> Java and Python interfaces support the collection of multiple solutions?
>>
>> Keep up the good work!
>> Best regards,
>> J a n
>>
>>
>>> On 7 Dec 2016, at 22:58, Jonathan Currie <jonathan.currie at aut.ac.nz 
>>> <mailto:jonathan.currie at aut.ac.nz>> wrote:
>>>
>>> Hi Jan,
>>> That functionality does not exist via OPTI at present, but it sounds 
>>> like it should! I’ll have a look this weekend.
>>> Jonathan
>>> *From:*Scip [mailto:scip-bounces at zib.de]*On Behalf Of*Jan Goos
>>> *Sent:*Thursday, 8 December 2016 10:54 AM
>>> *To:*scip at zib.de <mailto:scip at zib.de>
>>> *Subject:*[SCIP] multiple SCIP solutions in Matlab
>>> Dear SCIPers,
>>> I am using SCIP via OPTI Toolbox in Matlab, and I'd like to 
>>> enumerate multiple solutions. After thoroughly reading the 
>>> documentation, I formulated the following example IP:
>>> opts = scipset('scipopts',{'constraints/countsols/collect',1});
>>> opts = optiset('solver','scip','solverOpts',opts);
>>> Opt = opti('f',0,'bounds',0,4,'xtype','I','options',opts)
>>> x = solve(Opt)
>>> I would like to get the 5 equally valid solutions [0,1,2,3,4], but I 
>>> only get 1 [0]. Can you please tell me what I'm missing?
>>> Best regards,
>>> J a n
>>
>>
>>
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>
> -- 
> \__________________
>
> Matthias Miltenberger
> Zuse Institute Berlin
> Takustr. 7, 14195 Berlin
> www.zib.de/miltenberger
> miltenberger at zib.de
> +49 (30) 841 85-245
>
>
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