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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>John,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This would be a useful addition.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>On a separate topic, I have had some bad experiences with the
pre-solve routine. For large problems that involve a great deal of
reduction pre-solve crashes with an OS memory error. I tried some cases
where we were trying a “ do nothing” solution by forcing all
primary decision variables to zero. Pre-solve in some cases took much
longer time to solve the problem than normal cases and in some cases it
crashed. Is there a chance for someone to take a look at the code for
potential issues.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>thanks<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
clp-bounces@list.coin-or.org [mailto:clp-bounces@list.coin-or.org] <b>On Behalf
Of </b>John J Forrest<br>
<b>Sent:</b> Wednesday, February 11, 2009 4:14 AM<br>
<b>Cc:</b> clp@list.coin-or.org<br>
<b>Subject:</b> Re: [Clp] MpsTolerance<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p style='margin-bottom:12.0pt'>In CoinMpsIO.cpp tinyElement is hard coded as
1.0e-14.<br>
<br>
In Clp, when primal or dual is entered all values < smallElement_ are
treated as zero. This has default value of 1.0e-20 and can be changed by
setSmallElement.<br>
<br>
If there was a general feeling that it would be useful to have a function like
ekk_setRtolmps then it would be easy to add smallElement_ to CoinMpsIO.?pp and
let Clp use max of ClpModel::smallElement_ and CoinMpsIO::smallElement_ when
reading an Mps file.<br>
<br>
John Forrest<br>
<br>
<img width=16 height=16 id="_x0000_i1025"
src="cid:image001.gif@01C98C2D.2082CDB0"
alt="Inactive hide details for Emrah Tanriverdi ---02/10/2009 03:02:15 PM---Hi,"><span
style='color:#424282'>Emrah Tanriverdi ---02/10/2009 03:02:15 PM---Hi,</span><o:p></o:p></p>
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<p class=MsoNormal><img width=96 height=1 id="_x0000_i1026"
src="cid:image003.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt;color:#5F5F5F'>From:</span><o:p></o:p></p>
</td>
<td width="100%" valign=top style='width:100.0%;padding:0in 0in 0in 0in'>
<p class=MsoNormal><img width=1 height=1 id="_x0000_i1027"
src="cid:image004.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt'>Emrah Tanriverdi
<emrahtanriverdi@yahoo.com></span><o:p></o:p></p>
</td>
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<tr>
<td width="1%" valign=top style='width:1.0%;padding:0in 0in 0in 0in'>
<p class=MsoNormal><img width=96 height=1 id="_x0000_i1028"
src="cid:image003.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt;color:#5F5F5F'>To:</span><o:p></o:p></p>
</td>
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<p class=MsoNormal><img width=1 height=1 id="_x0000_i1029"
src="cid:image004.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt'>clp@list.coin-or.org</span><o:p></o:p></p>
</td>
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<p class=MsoNormal><img width=96 height=1 id="_x0000_i1030"
src="cid:image003.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt;color:#5F5F5F'>Date:</span><o:p></o:p></p>
</td>
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<p class=MsoNormal><img width=1 height=1 id="_x0000_i1031"
src="cid:image004.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt'>02/10/2009 03:02 PM</span><o:p></o:p></p>
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<p class=MsoNormal><img width=96 height=1 id="_x0000_i1032"
src="cid:image003.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt;color:#5F5F5F'>Subject:</span><o:p></o:p></p>
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<p class=MsoNormal><img width=1 height=1 id="_x0000_i1033"
src="cid:image004.png@01C98C2D.2082CDB0"><br>
<span style='font-size:10.0pt'>[Clp] MpsTolerance</span><o:p></o:p></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<br>
<br>
<span style='font-size:13.5pt'>Hi,</span><br>
<br>
<span style='font-size:13.5pt'>Is there setting mps tolerance function in CLP,
I know there is one in OSL as following</span><br>
<span style='font-size:13.5pt'>// Set MPS file tolerance so that very small
numbers<br>
// are considered zero.<br>
ekk_setRtolmps(myModel, mpsTolerance);</span><br>
<span style='font-size:13.5pt'>Thanks,</span><br>
<tt><span style='font-size:10.0pt'>_______________________________________________</span></tt><span
style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt>Clp mailing list</tt><br>
<tt>Clp@list.coin-or.org</tt><br>
<tt><a href="http://list.coin-or.org/mailman/listinfo/clp">http://list.coin-or.org/mailman/listinfo/clp</a></tt><br>
<br>
</span><o:p></o:p></p>
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