[SCIP] Verry simple model seems very hard for scip

[Stefan Vigerske]

Hi,

HiGHS just didn't do a good job in letting you know that it cannot 
handle quadratic constraints.
For what it's worth, with https://github.com/ERGO-Code/HiGHS/pull/1364 
you will get a parser error from HiGHS on this instance.

Stefan

On 28/07/2023 22:51, Thomas Bulka wrote:
> 
> Peter Notebaert <mail at peno.be> writes:
> 
>> Attached model (17 variables, 19 constraints) takes scip forever to solve.
>>
>> Maybe something interesting to investigate.
>>
>> Note that if you disable the first constraint and replace it by the commented line below it that is solves very quickly.
>>
>> Peter
>>
>> [4. application/octet-stream; sciploop.lp]...
>>
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> 
> Hi,
> 
> are you sure that the model is feasible? Out of curiosity I tried to
> solve the model with HiGHS and it considers the model to be infeasible
> upon presolve.
> 
> Regards,
> 
> Thomas
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