<br><font size=2 face="sans-serif">Kyle,</font>
<br>
<br><font size=2 face="sans-serif">What it means is that the code expects
a variable at its lower bound to have a positive reduced cost or at least
>= -tolerance. An assert failure would tend to indicate that the
problem is badly scaled.</font>
<br>
<br><font size=2 face="sans-serif">However the solution is to refresh your
copy of Clp. That assert is now at line 2084 AND commented out. I
did that some weeks ago as for some reason CBC was being handed nastier
problems - maybe because of changes to cut generators.</font>
<br>
<br><font size=2 face="sans-serif">If you still have problems please send
me more information.</font>
<br>
<br><font size=2 face="sans-serif">John Forrest</font>
<br>
<br>
<br>
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<td width=40%><font size=1 face="sans-serif"><b>Kyle Ellrott <kellrott@csbl.bmb.uga.edu></b>
</font>
<br><font size=1 face="sans-serif">Sent by: coin-lpsolver-bounces@list.coin-or.org</font>
<p><font size=1 face="sans-serif">01/10/2005 01:50 PM</font>
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<div align=right><font size=1 face="sans-serif">To</font></div>
<td valign=top><font size=1 face="sans-serif">coin-lpsolver@list.coin-or.org</font>
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<td>
<div align=right><font size=1 face="sans-serif">cc</font></div>
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<div align=right><font size=1 face="sans-serif">Subject</font></div>
<td valign=top><font size=1 face="sans-serif">[Coin-lpsolver] Clp Problems</font></table>
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<br>
<br>
<br><font size=2><tt>I'm currently working on some software that uses the
Cbc module to <br>
solve an integer programming problem. While I'm not confident that
my <br>
constraint matrix has been set up correctly, as far as I know, it <br>
should be fine.<br>
I was wondering if anyone could help figure out what set of events <br>
would trigger the following assertion:<br>
<br>
ClpSimplexDual.cpp:2031: failed assertion <br>
`oldValue>=-dualTolerance_*1.0001'<br>
<br>
What kind of problems is their assertion typically in response to?<br>
<br>
Thanks,<br>
<br>
Kyle<br>
<br>
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</tt></font>
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