[Cbc] Constraint Violation in CBC

[Thomas Vincent]

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
> 
> 
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