[BCP] Never mind (Re: "BM: Couldn't branch!")

[Eric W Anderson]

Never mind, it looks like this was a symptom of an unrelated problem that was
causing memory corruption.


Thus spake Eric W Anderson (Eric.Anderson at colorado.edu):

> Another new-user question here:
> 
> I have a simple application based on the SHELL example.  The problem is passed
> in from Python using SWIG, and the results are passed back out the same way,
> but otherwise it's pretty much taken straight from the example.
> 
> It always runs fine on small MIPs, but when I give it a modest-sized one (~1500
> binary vars), my application frequently dies with the error "BM: Couldn't
> branch!".  Here's what I know:
> 
>  *  This happens in from BCP_lp_user::select_branching_candidates(...),
>     when try_to_branch(...) returns 0 and does not set branchObject.  
> 
>  *  That occurs when choose->setupList(&branchInfo, true) returns 0.  (choose
>     is an OsiChooseVariable* pointing to an OsiChooseStrong).  
> 
>  *  I don't understand OsiChooseStrong, or the general operation of BCP well
>     enough to know (a) why this is happening or (b) why it's a bad thing.
> 
> Is this problem familiar to anyone?  Any suggestions?  
> 
> Thanks again,
> Eric
> 
-- 
Eric W. Anderson                                   University of Colorado
eric.anderson at colorado.edu                      Dept. of Computer Science
phone: +1-720-984-8864                   Systems Research Lab - ECCR 1B54

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