Ok - I need to review old postings - but simple question....<br><br>Is OSI::branchAndBound and/or CBC::branchAndBound really B&B or is it Branch-and-Cut-(and Heuristics). I.e., if it is really just B&B, I don't want it. I am looking for a simple interface to call a full blown MILP solver.... and my model originated in OSI - but I am ok translating to whatever object I need to. So, how do I do that with CBC? <br>
<br>I'd expect something like:<br><br>CbcModel m(*osiObject);<br>m.solve();<br><br>??<br><br><div class="gmail_quote"><br><br><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi,<br>
<div class="im"><br>
> Could you expand on OsiCbc not being used anymore?<br>
<br>
</div>I remember some discussions on some list that OsiCbc is not maintained<br>
anymore (the last change to the .cpp file was 2 years ago), and that<br>
things like solving again after changing the instance might not work in<br>
every case.<br>
It probably still works when one just sets up MIP via Osi, do a solve,<br>
and then wants a primal solution vector. Whether that gives the best<br>
performance is another issue.<br>
<div class="im"><br>
> I have software<br>
> which depends on OsiCbc. Is there another MIP code that should be used<br>
> instead via Osi?<br>
<br>
</div>Solving MIPs via Osi is generally not the best idea (see also the recent<br>
discussion at <a href="http://list.coin-or.org/pipermail/osi/2009-April/000200.html" target="_blank">http://list.coin-or.org/pipermail/osi/2009-April/000200.html</a>).<br>
If it is just solving one instance, then OsiCbc still seem to work, but<br>
also Symphony, Glpk, and Cplex work in my experience.<br>
<br>
Stefan<br>
<font color="#888888"><br>
--<br>
</font><div><div></div><div class="h5">Stefan Vigerske<br>
Humboldt University Berlin, Numerical Mathematics<br>
<a href="http://www.math.hu-berlin.de/%7Estefan" target="_blank">http://www.math.hu-berlin.de/~stefan</a><br>
<br>
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