<br><font size=2 face="sans-serif">Posting reply from Oktay to mingling
question (below) to the list. </font>
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Robin Lougee-Heimer, PhD<br>
Program Manager, COIN-OR<br>
IBM TJ Watson Research Center<br>
1101 Kitchawan Road, Yorktown Heights, NY 10598<br>
ph: 914-945-3032 fax: 914-945-3434 <br>
robinlh@us.ibm.com<br>
http://www.coin-or.org<br>
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<td width=40%><font size=1 face="sans-serif"><b>Oktay Gunluk/Watson/IBM</b></font>
<p><font size=1 face="sans-serif">12/10/2009 03:21 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">Robin Lougee-Heimer/Watson/IBM@IBMUS</font>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">Re: mingling inequality question</font><a href=Notes://D01MC605/8525643D0049AB40/5E502A1BAAAF40CA85256197006C1A32/827D19F1FB80E5EC85257688006E801B>Link</a></table>
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<br><font size=2 face="sans-serif">i looked at the website but couldn't
see how one replies to tickets.</font>
<br><font size=2 face="sans-serif"> my answer is: "yes, it makes
a lot of sense to implement them. i also think that it is not very straight
forward to use them effectively for general MIP problems."</font>
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_____________________________________________________________<br>
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Oktay Gunluk, Math. Sciences , IBM Research ---- gunluk@us.ibm.com,
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http://www.research.ibm.com/people/o/oktay/ <br>
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<td width=40%><font size=1 face="sans-serif"><b>Robin Lougee-Heimer/Watson/IBM</b>
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<p><font size=1 face="sans-serif">12/10/2009 03:15 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td><font size=1 face="sans-serif">gunluk@us.ibm.com</font>
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<div align=right><font size=1 face="sans-serif">cc</font></div>
<td><font size=1 face="sans-serif">cgl@list.coin-or.org</font>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td><font size=1 face="sans-serif">mingling inequality question</font></table>
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Oktay:</font><font size=3> <br>
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Can you respond and close out this ticekt in the Cgl bug tracking
system? A cut & paste is below for your convenience.
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Thanks,</font><font size=3> </font><font size=2 face="sans-serif"><br>
Robin</font><font size=3> <br>
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https://projects.coin-or.org/Cgl/ticket/30</font><font size=3> <br>
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Atamtürk and Günlük describe an extension to mixed integer rounding inequalities
for general mixed integer linear programming which incorporates variable
bound information. In the conclusion to this techreport they claim it is
simple to implement using only the primitives used for standard MIR separation:
</font><a href=http://www.ieor.berkeley.edu/~atamturk/pubs/mingle.pdf><font size=3 color=#c20000><u> http://www.ieor.berkeley.edu/~atamturk/pubs/mingle.pdf</u></font></a><font size=3>
I am not familiar with the Cgl MIR implementations and maybe this has been
considered before, but could a COIN-OR expert comment whether it makes
sense to implement the inequalities described? <br>
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----------------------------------------------------------------------------------<br>
Robin Lougee-Heimer, PhD<br>
Program Manager, COIN-OR<br>
IBM TJ Watson Research Center<br>
1101 Kitchawan Road, Yorktown Heights, NY 10598<br>
ph: 914-945-3032 fax: 914-945-3434 <br>
robinlh@us.ibm.com<br>
http://www.coin-or.org<br>
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