[Cbc] Disabling "Reduced Cost Fixing"?

[John Forrest]

Daniel,

Try

model.setSpecialOptions(model.specialOptions()&(~512));

the 512 is set by default to try reducing size of problem after 100 nodes.

John Forrest

On 03/08/12 17:38, Dan Fullmer wrote:
>
> I'm trying to display particular variables from the integer solutions 
> found while CBC is running. I've hooked up a CbcEventHandler that 
> pulls in values from bestSolution(). I'm using CbcMain to do the real 
> work on my model. (Like examples/driver4.cpp). I've turned off 
> preprocessing so I'm not looking at the processed model.
>
> However, as my model is being optimized, I will sometimes see:
>
> Cbc0044I Reduced cost fixing - 3125 rows, 14771 columns - restarting 
> search
>
> After which, my callback is never activated, since the event handler 
> isn't registered with the new problem.
>
> Is there an option that I'm missing that can disable this? Or am I 
> going about this the wrong way?
>
> Thanks,
>
> -Daniel Fullmer
>
>
>
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