Hi János,<br><br>SYMPHONY does not have the ability to exploit this block structure. Is there a reason you don't just use DIP? <br><br>Cheers,<br><br>Ted<br><br><div class="gmail_quote">On Mon, Mar 12, 2012 at 11:29 AM, Rudan János <span dir="ltr"><<a href="mailto:rudanj@gmail.com">rudanj@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello,<br>
<br>
in my current work I have to solve huge MILPs (having around 25.000<br>
constraints and 5000 variables from which 3800 are binary variables).<br>
Each of the problems have a really clear block-angular structure, I<br>
can specify the border of the blocks in the constraint matrix exactly.<br>
I guess that this should significally decrease the solving time,<br>
because with the help of them independent subproblems could be<br>
formulated and solved.<br>
<br>
Is there any way to provide this additional structural information to<br>
Symphony? I didn't found any way to pass this kind of structural info<br>
towards the solver. (For example in case of DIP, there's the MILPBlock<br>
application where I can specify explicity the blocks in the constraint<br>
matrix - I'm looking for a similar solution for Symphony).<br>
<br>
Thanks for the help.<br>
<br>
Best regards,<br>
János Rudan<br>
<br>
---<br>
PhD student<br>
PPCU, Budapest, Hungary<br>
<br>
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</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/%7Eted" target="_blank">coral.ie.lehigh.edu/~ted</a><br>
<br>