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<div class="moz-cite-prefix">And as you can see presolve takes only
a few seconds and after that branchAndBound takes many minutes.<br>
Why is that happening? <br>
Since, at the end, both give the same objective (and column
solution(?)).<br>
<br>
On 17/9/2012 18:56, Christos wrote:<br>
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<blockquote cite="mid:50574824.4010201@gmail.com" type="cite">
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<div class="moz-text-flowed" style="font-family: -moz-fixed;
font-size: 14px;" lang="x-western">Hi all, <br>
<br>
I made this program which is consisted from 53442 columns,
12540 binaries, 22386 rows and 87653 elements. <br>
<br>
I get the following messages: <br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://imageshack.us/g/1/9763755/">http://imageshack.us/g/1/9763755/</a>
<br>
<br>
In your opinion are these messages logic? <br>
<br>
When i expand the model to a bigger (53442x25170 matrix and
112578 nonzeros), i get numerous like these and the total time
exceeds 7 min for a dual core processor of 2006. <br>
Is this normal? <br>
<br>
As you can see i use initialSolve() first and then
branchAndBound(), i think this is the usual method to solve a
MIP/MILP problem, am i right? <br>
<br>
<br>
And something irrelevant: what i have to do in order to make
the example program "nway.cpp" read my .mps file? <br>
<br>
Sorry if i made you tired, and thank you very much in advance. <br>
<br>
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