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<div class="moz-cite-prefix">i have the latest version, 2.7.7....<br>
<br>
I solve it by using the default cbc solver, (i am not getting
involved in the solver) with this way:<br>
<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><i><small><br>
CbcMain1(3,argv2,model);
</small></i><br>
<br>
So, i do not think that it's ommiting the presolve step, am i
wrong?<br>
<br>
Where can i find the latest version, and how can i load an mps
file?<br>
<br>
Thank you<br>
<br>
On 9/10/2012 20:42, David Ibarra Gómez wrote:<br>
</div>
<blockquote cite="mid:DUB121-W264ACA45902B3CC4C2E78A38F0@phx.gbl"
type="cite">
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Hi,
<div><br>
</div>
<div>there are several things that can cause this:</div>
<div><br>
</div>
<div>
<ul>
<li>different solvers version,</li>
<li>solving is a complex task: <span style="font-size: 10pt;
">presolve (cuting planes, heuristics, ...) and then b</span><span
style="font-size: 10pt; ">ranch and bound (cut). If you
omit the first part or you do not do exactly the same
steps result could be different.</span></li>
</ul>
<div><br>
</div>
Did you try to solve using CBC CLI (stand alone executable) ?</div>
<div><br>
</div>
<div>Regards<br>
<br>
<div>
<hr id="stopSpelling">Date: Tue, 9 Oct 2012 12:16:49 +0300<br>
From: <a class="moz-txt-link-abbreviated" href="mailto:chtsolak@gmail.com">chtsolak@gmail.com</a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a><br>
Subject: [Cbc] solving time in C++ >> time in Gams<br>
<br>
Hi all again,<br>
<br>
I have 1 question for you, if i solve it, i won't bother
you again <span class="ecxmoz-smiley-s4"><span> :-P </span></span><br>
<br>
I am using cbc in order to make an executable via MS visual
studio which solves a model.<br>
In order to solve it, takes 60 mins<br>
<br>
I have made the same problem with GAMS and solved it in 30
secs, 120 times faster!!<br>
<br>
Is it because of an error in modeling or due to the
different interface? (exe-GAMS)<br>
<br>
Why is there this enormous difference?<br>
<br>
<br>
Thank you in advance.<i><small><i><small><br>
</small></i></small></i><br>
<i><small><i><small><br>
</small></i><br>
</small></i> <br>
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</blockquote>
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