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<p>Lasse,<br>
<br>
I don't see that the changes I suggested would cause that. Try just replacing initialSolve by resolve - also print out size of model before resolve. If you want to send me stuff directly do so (as long as it is not too large).<br>
<br>
John Forrest<br>
<br>
<img width="16" height="16" src="cid:1__=0ABBFF73DFB96C4F8f9e8a93df938@us.ibm.com" border="0" alt="Inactive hide details for Lasse Kliemann ---06/24/2009 02:53:42 PM---* Message by -John J Forrest- from Wed 2009-06-24:"><font color="#424282">Lasse Kliemann ---06/24/2009 02:53:42 PM---* Message by -John J Forrest- from Wed 2009-06-24:</font><br>
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<font size="2" color="#5F5F5F">From:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFF73DFB96C4F8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">Lasse Kliemann <lasse-list-coin-2009@mail.plastictree.net></font></td></tr>
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<font size="2" color="#5F5F5F">To:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFF73DFB96C4F8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">clp@list.coin-or.org</font></td></tr>
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<font size="2" color="#5F5F5F">Date:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFF73DFB96C4F8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">06/24/2009 02:53 PM</font></td></tr>
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<font size="2" color="#5F5F5F">Subject:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFF73DFB96C4F8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">Re: [Clp] How to get integral solution for totally unimodular matrix?</font></td></tr>
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<tt>* Message by -John J Forrest- from Wed 2009-06-24:<br>
<br>
> If you replace the initialSolve by resolve, then the problem goes away.<br>
> However the long thin strategy is 50 times faster!<br>
> <br>
> To get good performance and normal simplex characteristics you need to add<br>
> ten lines. I attach a modified integral.cpp.<br>
<br>
Thank you, John, for the explanation and the example code.<br>
<br>
I ran it, but it keeps complaining about an empty problem:<br>
<br>
Clp3002W Empty problem - 250 rows, 0 columns and 0 elements<br>
<br>
The problem *is* loaded via 'assignProblem'; I also tried:<br>
<br>
si->getModelPtr()->loadProblem(*matrix, col_lb, col_ub,<br>
objective, row_lb, row_ub);<br>
<br>
to no avail.<br>
<br>
<br>
Thank you for a hint.<br>
Lasse<br>
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