[Cbc] Constraint Violation in CBC

[Thomas Vincent]

Hi Xin, John,

Le 09/07/2015 12:05, John Forrest a écrit :
> Xin, (Thomas),
> 
> Coin lp reader wants an "End"

Indeed!
It now works flawlessly with 2.8.12 from Debian Jessie.

> With that I could not reproduce error with stable 2.9.  Solution attached

Xin, what version do you use? Could you produce a log?

Thomas

> 
> John Forrest
> On 09/07/15 10:46, Thomas Vincent wrote:
>> Hello Xin,
>>
>> Just tried your instance (the name of the last variable at the end of
>> the file is incomplete, btw, it should be n_5301_Bruges_Toulouse).
>>
>> Cbc crashed when trying to load the file in command line.
>> However, GLPK was able to solve it and returned a solution with an
>> objective value of 2.592971494e+05.
>>
>> So I would say that your model looks ok and maybe something is going
>> wrong with CBC.
>>
>> Cheers,
>> Thomas
>>
>> Le 08/07/2015 15:01, Xin TANG a écrit :
>>> Hi,
>>>
>>>      I am running CBC by using ORtools to solve a MIP model of a
>>> location problem.
>>> The model is exported in LP format attached in this mail.
>>>     CBC gives a feasible solution and all values of decision variables
>>> and  objective function are 0. But this
>>> solution violate many constraints. And I checked by running Cplex the same
>>> model (if I code correctly), and the optimal solution value are not 0.
>>>     Could you tell me if the constraint format is OK or what is reason
>>> of this problem.
>>>
>>> Thanks and regards,
>>>
>>> Xin
>>>
>>>
>>> _______________________________________________
>>> Cbc mailing list
>>> Cbc at list.coin-or.org
>>> http://list.coin-or.org/mailman/listinfo/cbc
>>>
>>
>>
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> 
> 
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