[Cbc] Incumbent solution

[Mikhail Nediak]

Hi Stefan,

Thanks much for the reply.

There are two functions by that name. One of them requires "CBC_Message 
how" as a first parameter. Do you know which one should be used?
I actually tried to use them in the following manner:

OsiCbcSolverInterface test;
//....
test.getModelPtr()->setBestSolution(...);

with very strange outcomes.

Would setBestObjectiveValue() achieve similar effects in terms of B&B node 
pruning behavior?

Thanks in advance.
Best,
Mikhail




Stefan Vigerske <stefan at math.hu-berlin.de> 
14/07/2008 05:17 AM

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Mikhail Nediak <MNediak at business.queensu.ca>
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Re: [Cbc] Incumbent solution






Hi,

> Right now I use CBC via OSI and would like to pass an incumbent solution 
to the 
> B&B (a single solution vector at the start of the run).
> Does anyone know of an easy and tested way to do it?  Do I need to go 
through 
> CbcModel & setBestSolution() or definition of a new heuristic, etc?

I think going through CbcModel is the easiest solution.
John recently added another function CbcModel::setBestSolution(...) 
which you can give a primal solution and then it checks whether it is 
feasible and keeps it if so.

Stefan

-- 
Stefan Vigerske
Humboldt University Berlin, Numerical Mathematics
http://www.math.hu-berlin.de/~stefan

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