<div dir="ltr"><div dir="ltr"><div>Hi Zachary,</div><div><br></div><div>welcome to the GCG world, glad that you like it so far. The code grew too fast last year, so documentation is lagging behind -- we are working on documenting the reporting facilities etc. currently, so any input/wishes from your point as a user is most appreciated.</div><div><br></div><div>It is not the idea to re-arrange the MPS file explicitly, instead, you can write a second file, the DEC file, that contains the re-arrangement information. If you plan to analyze the decomposition (automatically), look at that file. It can also be used to start GCG with a particular decomposition without detection (just read in MPS and a corresponding DEC file) and this is also the way to force a particular decomposition that GCG does not/cannot automatically detect.</div><div><br></div><div>You mentioned the "explore" menu which is the place we intended for, well, exploration. "visualize" is your best friend here, showing the decomposition as a PDF (you may need to set up your PDF viewer for this). You may also try to "write report" which produces a LaTeX file with some (maybe/hopefully) interesting information.</div><div><br></div><div>Check section "GCG" in the latest release report <a href="http://www.optimization-online.org/DB_HTML/2018/07/6692.html">http://www.optimization-online.org/DB_HTML/2018/07/6692.html</a> which does not describe how to do things but hints at what exists that we find is most useful for starters. Again. much more documentation is under way, until this is done, feel free to contact us here on the list or directly any time.</div><div><br></div><div>We are also interested in your findings, wishes for extensions etc.</div><div><br></div><div>Take care, Marco</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Am Do., 21. Feb. 2019 um 04:32 Uhr schrieb Zachary Steever <<a href="mailto:zjsteeve@buffalo.edu">zjsteeve@buffalo.edu</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hello,<br>
<br>
I am a new user of SCIP and GCG. First, I'd just like to thank you for your wonderful product. I have a question regarding GCG. I am looking to:<br>
(1) read in a model from an mps file<br>
(2) use “detect” to identify block structures<br>
(3) decompose/rearrange my model according to one of the identified structures<br>
(4) simply save the rearranged model back into into an mps fiile (maintaining its new structure.<br>
<br>
Of note, I am not looking to solve the instance, but rather to save the decomposed model so that I may otherwise analyze its new structure.<br>
<br>
In the interactive GCG shell, I am able to run "detect", and when I use "explore" I see that GCG has detected multiple decompositions. When I use "write/problem" and then inspect the resulting mps file, however, I see that the original structure still exists. Any help would be greatly appreciated (Alternatively, if there is a way to do this in Python with pyscipopt, that would also be helpful).<br>
<br>
Thank you in advance for your help,<br>
Zachary Steever<br>
<br>
<br>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature">Prof. Dr. Marco Lübbecke<br>RWTH Aachen University <br>Chair of Operations Research <br>Kackertstrasse 7 <br>D-52072 Aachen <br>Germany <br><br>fon / fax: +49 241 80-93362 / 92369<br><a href="mailto:marco.luebbecke@rwth-aachen.de" target="_blank">marco.luebbecke@rwth-aachen.de</a><br><a href="http://www.or.rwth-aachen.de/luebbecke" target="_blank">www.or.rwth-aachen.de/luebbecke</a><br><br></div>