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<p>Will fix in Clp<br>
<br>
John Forrest<br>
<br>
<img width="16" height="16" src="cid:1__=0ABBFCA8DFF7B3AB8f9e8a93df938@us.ibm.com" border="0" alt="Inactive hide details for Mikhail Nediak ---09/24/2009 12:56:18 PM---Hi, I am running into a"><font color="#424282">Mikhail Nediak ---09/24/2009 12:56:18 PM---Hi, I am running into a</font><br>
<br>
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<font size="2" color="#5F5F5F">From:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFCA8DFF7B3AB8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">Mikhail Nediak <MNediak@business.queensu.ca></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__=0ABBFCA8DFF7B3AB8f9e8a93df938@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__=0ABBFCA8DFF7B3AB8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">09/24/2009 12:56 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__=0ABBFCA8DFF7B3AB8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">[Clp] SIGFPE exception in Clp</font></td></tr>
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<font size="2" color="#5F5F5F">Sent by:</font></td><td width="100%"><img width="1" height="1" src="cid:2__=0ABBFCA8DFF7B3AB8f9e8a93df938@us.ibm.com" border="0" alt=""><br>
<font size="2">clp-bounces@list.coin-or.org</font></td></tr>
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<br>
<br>
Hi,<br>
<br>
I am running into a <br>
<br>
"Program received signal SIGFPE, Arithmetic exception."<br>
<br>
problem when running interior point solver component of Clp-1.10.1. <br>
<br>
I think the problem is a floating point overflow in places like<br>
line 346 of ClpPredictorCorrector.cpp:<br>
if (complementarityGap_>=1.05*lastComplementarityGap) {<br>
and line 930 of the same file:<br>
if (lowerSlack_[iColumn]<maximumPrimalStep*delta) {<br>
<br>
The variables lastComplementarityGap and maximumPrimalStep are defaulted to COIN_DBL_MAX which is 1.7976931348623157e+308 in this case. Multiplying them by something greater than 1 causes an overflow on this system.<br>
<br>
Does anyone know of some compiler flags which change how such overflows are handled?<br>
<br>
Thanks in advance.<br>
Best,<br>
Mikhail<br>
-- <br>
Mikhail Nediak<br>
Assistant Professor<br>
-------------------------------------------------------<br>
Queen's School of Business<br>
Kingston, Ontario<br>
Canada K7L 3N6<br>
Voice: 613.533.3144<br>
Fax: 613.533.2325<br>
E-mail: <a href="mailto:mnediak@business.queensu.ca"><u><font color="#0000FF">mnediak@business.queensu.ca</font></u></a><br>
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