[Scip] error information "[src/scip/scip.c:11865] ERROR: LP not solved to optimality"

[Gerald Gamrath]

Hi,

what do you need the LP objective value for in the pricing routine? I 
don't think that a pricer needs it.

Did you find a solution before the errors occured? I conjecture that the 
solving process of the LP was stopped
due to the objective limit, so it is not solved to optimality. The dual 
solution values can be used for pricing, anyway.
You could call SCIPgetLPSolstat() to check whether it returns 
"SCIP_LPSOLSTAT_OBJLIMIT" or value "4", if not, please tell us.

Do you use Farkas pricing to obtain feasibility of your restricted LP? 
In this case, if Farkas pricing is performed,
it should return "SCIP_LPSOLSTAT_INFEASIBLE" or value "2", so that would 
also be correct.

Please tell us whether you could resolve the problem.

Regards,
Gerald

XiangyongLi schrieb:
> Dear all,
>  
>  
> I use SCIP to design a branch and price code. At each call of pricer, 
> I want to use SCIPgetLPObjval(scip) to get the LP objective value. 
> When I call SCIPgetLPObjval(scip) at the root node, the following 
> error information came up:
>  
> [src/scip/scip.c:11865] ERROR: LP not solved to optimality,
>  
> and it returned the LP objective value is = 100000000000000000000.000000.
>  
> If I ignored this error information, and continued to add new variable 
> at the root node, same error information came up at the next call of  
> SCIPgetLPObjval(scip).
>  
> Would you please tell me what is the problem?  Thanks.
>  
>  
>  
>  
>  
>  
>  
>  
> Best regards.
>  
>  
> Xiangyong Li
>  
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