[Dip] Problem with 0 integer variables

[Matthew Galati]

That is weird. Maybe one is void'ing out the exception/assertion check and the other is not - based on some compiler flag difference. I'll look into the Linux side - I don't have MacOS to check that side. 

Does COIN support servers for project managers to log in and try stuff - so I can debug a Mac version?

Either way, I will make DIP work for LPs soon. Currently, it only works for IP.



> -----Original Message-----
> From: dip-bounces at list.coin-or.org [mailto:dip-bounces at list.coin-or.org]
> On Behalf Of Kipp Martin
> Sent: Thursday, September 02, 2010 2:55 AM
> To: dip at list.coin-or.org
> Subject: [Dip] Problem with 0 integer variables
> 
> Hi:
> 
> I am experiencing a very strange phenomenon with the
> Dip/examples/SmallIP example in the current (revision 281) trunk version
> of the project. If, with Linux with gcc version 4.4.1, I remove the lines
> 
> m_modelPart1.integerVars.push_back(0);
> m_modelPart1.integerVars.push_back(1);
> m_modelPart2.integerVars.push_back(0);
> m_modelPart2.integerVars.push_back(1);
> 
> everything work fine and I get the LP relaxation value of 2.25. However, if I
> do exactly the same thing with Mac OS X gcc version 4.2.1 I get the error
> 
> COIN Exception [ modelCore->integerVars.size() > 0 ] at
> ../../../Dip/src/DecompBranch.cpp:L38 in
> 
> so for some reason on the Mac OS X Dip still thinks there are integer
> variables and calls DecompBranch. However, DecomBranch does not get
> called in Linux. I am totally at a loss as to why DecompBranch would get
> called on the Mac but not  Linux when there are no integer variables.
> Does anyone have a suggestion as to what I might look for?
> 
> Thanks
> 
> 
> --
> Kipp Martin
> Professor of Operations Research
> and Computing Technology
> Booth School of Business
> University of Chicago
> 5807 South Woodlawn Avenue
> Chicago, IL 60637
> 773-702-7456
> kmartin at chicagobooth.edu
> http://www.chicagobooth.edu/faculty/bio.aspx?person_id=12825325568
> http://projects.coin-or.org/OS
> 
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