I merged to trunk and also stable/0.58.<br><br>Ted<br><br><div class="gmail_quote">On Fri, Dec 21, 2012 at 5:21 PM, Haroldo Santos <span dir="ltr"><<a href="mailto:haroldo.santos@gmail.com" target="_blank">haroldo.santos@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><font face="arial,helvetica,sans-serif">Should be fixed in trunk also, isn't ?<br></font><br><div class="gmail_extra">
<div><div class="h5"><div class="gmail_quote">On Fri, Dec 21, 2012 at 8:02 AM, John Forrest <span dir="ltr"><<a href="mailto:john.forrest@fastercoin.com" target="_blank">john.forrest@fastercoin.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Thomas,<br>
<br>
As I am unable to justify it and as removing made a slight
improvement on some very limited tests, I have removed the 500 in
Cgl/0.57 which is what cbc uses.<span><font color="#888888"><br>
<br>
John</font></span><div><div><br>
<br>
On 20/12/12 19:55, Thomas Schoenemann wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div>
<div style="font-size:12pt;font-family:times new roman,new york,times,serif">Hi all,<br>
<br>
my application of Cbc (where I added a GomoryCut generator) was
producing abnormally large cuts at the root node, although I had
set a limit. So I looked into the code and found this passage
(line 679 of GomoryCut.cpp):<br>
<br>
<br>
limit = limitAtRoot_;<br>
if (!info.pass) {<br>
tolerance1=1.0;<br>
tolerance2=1.0e-2;<br>
tolerance3=1.0e-6;<br>
tolerance6=1.0e-7;<br>
tolerance9=1.0e-5;<br>
if (!limit||limit>=500) <----!!!!!!!!!!!!!<br>
limit=numberColumns;<br>
} else {<br>
<br>
<br>
It appears that Cbc does not set info.pass (whatever that
signifies) and in this case a limit of 500 or larger is simply
ignored. <br>
<br>
I was wondering if there is a plausible reason for this. At the
very least I think this behavior should be documented in the
text on setLimitAtRoot(). Personally, I'd prefer if the part
"||limit >= 500" was removed, it does not make sense to me.<br>
<br>
I have a recent version of Cbc, checked out via svn (maybe there
is already a repository for 2.8?):<br>
<br>
URL: <a href="https://projects.coin-or.org/svn/Cbc/stable/2.7" target="_blank">https://projects.coin-or.org/svn/Cbc/stable/2.7</a><br>
Basis des Projektarchivs: <a href="https://projects.coin-or.org/svn/Cbc" target="_blank">https://projects.coin-or.org/svn/Cbc</a><br>
UUID des Projektarchivs: 6f23a84d-0c12-0410-9f0c-b73a89ba9ce0<br>
Revision: 1833<br>
Knotentyp: Verzeichnis<br>
Plan: normal<br>
Letzter Autor: stefan<br>
Letzte geänderte Rev: 1833<br>
Letztes Änderungsdatum: 2012-12-04 11:21:49 +0100 (Di, 04. Dez
2012)<br>
<br>
<br>
If you need my help, let me know.<br>
<br>
Best regards,<br>
Thomas Schoenemann<br>
<div><br>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
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<br>
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<br></blockquote></div><br><br clear="all"><br></div></div><span class="HOEnZb"><font color="#888888">-- <br><span style="font-family:courier new,monospace">=============================================================<br>
Haroldo Gambini Santos<br>Computing Department<br>Universidade Federal de Ouro Preto - UFOP<br>
email: haroldo [at ] <a href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>home/research page: <a href="http://www.decom.ufop.br/haroldo/" target="_blank">www.decom.ufop.br/haroldo</a><br></span>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Dr. Ted Ralphs<br>Associate Professor, Lehigh University<br>(610) 628-1280<br>ted 'at' lehigh 'dot' edu<br><a href="http://coral.ie.lehigh.edu/~ted" target="_blank">coral.ie.lehigh.edu/~ted</a><br>
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