[SCIP] Why I cannot free variables in the original problem?

[Gerald Gamrath]

Dear Xiangyong,

the original problem consists of all variables and constraints that you 
added during problem creation. After you start solving the problem, all 
new variables and constraints are only added to the transformed problem, 
i.e., also all priced variables are only added to the transformed problem.

In any case, releasing the variables twice sounds wrong. When you create 
the variables, they are automatically captured once, so unless you 
capture the variables again later (or capture the transformed variables 
after transformation), you just need to release them once.

Best,
Gerald

On 24.02.2018 01:41, Xiangyong Li wrote:
> Dear all,
>
> I am developing my own BP based on the Coloring example.
>
> I used original problem and transformed problem.
>
> In SCIP_DECL_PROBDELTRANS, I can release each variable by SCIPreleaseVar.
> But in SCIP_DECL_PROBDELORIG, I got error "Segmentation fault (core 
> dumped)" when I freed each variable (in fact I cannot successfully 
> free even one variable).
>
> Is each variable added to the transformed problem, not the original 
> problem?
>
> Thanks for your help.
>
> Xiangyong
>
>
>
>
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