[Scip] Overly motivated presolver?

[Julian Lamberty]

Sadly it does not solve the problem. When the probing or/and the trivial 
presolver are activated, the variables disappear from the constraints.

Regards,
Julian

Timo Berthold schrieb:
> Hi.
> 
> I attached a "very-close-to-next-release" version of SCIP and a updated 
> version of SoPlex (which you need if you want to compile the new SCIP version 
> with SoPlex as LP solver).
> Please let me know if this fixes your problem.
> And please don't spread around this inofficial version.
> 
> Best regards, Timo
> 
> Am Dienstag 23 September 2008 16:49:44 schrieb Julian Lamberty:
>>> Do I understand it correctly, that if you disable all the presolvers I
>>>
>>> mentioned:
>>>  >> constraints/linear/maxprerounds = 0
>>>  >> presolving/dualfix/maxrounds = 0
>>>  >> presolving/probing/maxrounds = 0
>>>  >> presolving/implics/maxrounds = 0
>>>  >> presolving/inttobinary/maxrounds = 0
>>>  >> presolving/trivial/maxrounds = 0
>>>
>>> then it works fine, but if you reenable only the "trivial" presolver,
>>> then the issue appears?
>>>
>>>
>>> Timo just told me that your question raised some bell in his mind. So,
>>> it may very well be that we have already fixed your bug in our current
>>> development version. SCIP 1.1.0 will be released very soon, but if you
>>> like, Timo can send you a prerelease immediately such that you can check
>>> whether this solves the issue.
>>>
>>> Note, however, that SCIP 1.1.0 will have some API changes, so you will
>>> also have to update your code (usually, it means that some additional
>>> parameters are needed for some methods; just read the CHANGELOG).
>>>
>>>
>>> Tobias
>> It works fine until I reenable either the "trivial" or the "probing"
>> presolver.
>>
>> I will check the changelog and talk to Moritz again concerning the new
>> SCIP version. Would be great if this issue would be solved with the new
>> version.
>>
>> Julian
> 

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