[Scip] Debugging column generation process

[Gerald Gamrath]

Dear Feng Gao,

first of all, you can set display/lpinfo to TRUE to see the output of 
the LP solver.

Then, what do you mean with what is going on in the master problem? 
There isn't so much going on except for solving the LP and then calling 
your pricer. In between, the current LP solution might be rounded and 
checked for feasibility.
If you want to get a lot of debug output, you could define SCIP_DEBUG in 
lp.c and solve.c, but this will probably flood you with too much output.

On the other hand, you can just get the relevant data within your 
pricing plugin. For example, the LP solutions status 
(SCIPgetLPSolstat()), dual values for constraints, or also the current 
LP (SCIPwriteLP()).

Best,
Gerald

On 08.04.2015 22:06, Feng Gao wrote:
> Dear all,
>
> Is there anybody familiar with the SCIP debug function? When the 
> column generation process begins, how can we get the information of 
> what is going on in the master problem except for the columns 
> generated in variable pricer?
>
> Thanks in advance,
>
> Feng Gao
>
>
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