<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<div class="moz-cite-prefix">Do you mean that i should include these
words in the command <i><small>const char *
argv2[]={"DAS","-solve","-quit"}; ?<br>
</small></i>(Don't shoot, i am inexperienced)<i><small><br>
</small></i><br>
On 5/10/2012 19:07, Haroldo Santos wrote:<br>
</div>
<blockquote
cite="mid:CACO7Fp0YFrSdrSvUWvs9HCQ-KtyJUdjUu=QGARqYBD5xy3ESTA@mail.gmail.com"
type="cite"><font face="arial,helvetica,sans-serif">Some options
may accelerate (or slowdown) a lot. Heuristics usually have a
huge impact on the solution time. Try including<br>
<br>
cbc air04.mps.gz passF 100 solve<br>
<br>
Also, if you to not need the optimality proof you can disable
cuts<br>
</font><br>
<font face="arial,helvetica,sans-serif"><font
face="arial,helvetica,sans-serif">cbc air04.mps.gz passF 100 </font></font><font
face="arial,helvetica,sans-serif"><font
face="arial,helvetica,sans-serif"><font
face="arial,helvetica,sans-serif">cuts off</font> solve</font><br>
<br>
[]'s<br>
</font><br>
<div class="gmail_quote">On Fri, Oct 5, 2012 at 5:20 AM, Christos
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:chtsolak@gmail.com" target="_blank">chtsolak@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 bgcolor="#FFFFFF" text="#000000">
<div>Thank you for your suggestion, i will check it and let
you know. <br>
<br>
But i think the problem is elsewhere.<br>
When i solve the same problem with gams via cbc solver it
takes 30-60 seconds, and not 60 minutes! <br>
Why?
<div>
<div class="h5"><br>
<br>
On 4/10/2012 17:57, Haroldo Santos wrote:<br>
</div>
</div>
</div>
<div>
<div class="h5">
<blockquote type="cite">On Thu, Oct 4, 2012 at 6:41 AM,
Christos <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:chtsolak@gmail.com" target="_blank">chtsolak@gmail.com</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> I am asking
you because i have a big problem. With very
small alteration in data operation time goes
from 9' to 65' !!!<br>
</div>
</blockquote>
<div>This is expected when solving Integer Programs
if you are willing to proof the optimality.<br>
One thing you can do to exit more quickly, if you
do not need the optimal solution (a good one may
be enough), is to force the solver to quit after
finding some solutions with the maxSolutions
paramater.<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> <br>
Any recommendations on the way i solve the
model? <br>
Do you think that the above times are normal for
such a model?
<div>
<div><br>
<div><br>
<br>
-------- Original Message --------
<table border="0" cellpadding="0"
cellspacing="0">
<tbody>
<tr>
<th align="RIGHT" nowrap="nowrap"
valign="BASELINE">Subject: </th>
<td>please help</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap"
valign="BASELINE">Date: </th>
<td>Wed, 03 Oct 2012 13:13:03 +0300</td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap"
valign="BASELINE">From: </th>
<td>Christos <a
moz-do-not-send="true"
href="mailto:chtsolak@gmail.com"
target="_blank"><chtsolak@gmail.com></a></td>
</tr>
<tr>
<th align="RIGHT" nowrap="nowrap"
valign="BASELINE">To: </th>
<td><a moz-do-not-send="true"
href="mailto:cbc@list.coin-or.org"
target="_blank">cbc@list.coin-or.org</a>
<a moz-do-not-send="true"
href="mailto:cbc@list.coin-or.org"
target="_blank"><cbc@list.coin-or.org></a></td>
</tr>
</tbody>
</table>
<br>
<br>
Hi all,<br>
<br>
i am a student in the final phase of the
Milp model which i want to solve.<br>
<br>
So, i have a milp model<br>
columns: 46614<br>
integers: 12540 (binary)<br>
rows: 40842<br>
nonzeros:117823<br>
<br>
I tried these simple methods <br>
1.<br>
<i><small>solver1.loadProblem(numcols,
numrows, start, index, value, collb,
colub, obj, rowlb, rowub);<br>
solver1.initialSolve();<br>
solver1.branchAndBound() ;</small></i><br>
2.<br>
<i><small>solver1.loadProblem(numcols,
numrows, start, index, value, collb,
colub, obj, rowlb, rowub);<br>
CbcModel model(solver1);<br>
CbcMain0(model);<br>
const char *
argv2[]={"DAS","-solve","-quit"}; </small></i>->
<u>i don't know what this do.</u><i><small><br>
CbcMain1(3,argv2,model); <br>
<br>
</small></i><small><big>Since i am an
amateur, can you help me?<br>
What method should i use to solve the
model? 1,2 or something else?<br>
Any recommendations?<br>
<br>
The 1st takes an hour and stops.<br>
The 2nd takes either 8' or 35'
depending on the data.<br>
<br>
Your help is much appreciated.<span><font
color="#888888"><br>
<br>
Christos</font></span></big></small><br>
<br>
</div>
<br>
</div>
</div>
</div>
<br>
_______________________________________________<br>
Cbc mailing list<br>
<a moz-do-not-send="true"
href="mailto:Cbc@list.coin-or.org"
target="_blank">Cbc@list.coin-or.org</a><br>
<a moz-do-not-send="true"
href="http://list.coin-or.org/mailman/listinfo/cbc"
target="_blank">http://list.coin-or.org/mailman/listinfo/cbc</a><br>
<br>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
=============================================================<br>
Haroldo Gambini Santos<br>
Computing Department - Universidade Federal de Ouro
Preto - UFOP<br>
email: haroldo [at ] <a moz-do-not-send="true"
href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>
home/research page: <a moz-do-not-send="true"
href="http://www.decom.ufop.br/haroldo/"
target="_blank">www.decom.ufop.br/haroldo/</a><br>
<br>
"Computer science is no more about computers than
astronomy <br>
is about telescopes." Edsger Dijkstra<br>
<br>
</blockquote>
<br>
</div>
</div>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
=============================================================<br>
Haroldo Gambini Santos<br>
Computing Department - Universidade Federal de Ouro Preto - UFOP<br>
email: haroldo [at ] <a moz-do-not-send="true"
href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>
home/research page: <a moz-do-not-send="true"
href="http://www.decom.ufop.br/haroldo/" target="_blank">www.decom.ufop.br/haroldo/</a><br>
<br>
"Computer science is no more about computers than astronomy <br>
is about telescopes." Edsger Dijkstra<br>
<br>
</blockquote>
<br>
</body>
</html>