<div dir="ltr"><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Hi Kevin,</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">Tried CBC without pre-processing</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">cbc model3.mps preprocess off solve </div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">and the optimal solution is generated. It seems that this is a pre-processing bug.</div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small"><br></div><div class="gmail_default" style="font-family:monospace,monospace;font-size:small">[]'s<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 20, 2017 at 9:52 AM, Kevin van Blokland <span dir="ltr"><<a href="mailto:kevin.vanblokland@cqm.nl" target="_blank">kevin.vanblokland@cqm.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">Dear CBC community,</font>
<br>
<br><font size="2" face="sans-serif">We are faced with a problem formulation
that is infeasible for CBC but optimal for commercial solvers. My best
guess is that the problem is related to integer/floating point precision
issues.</font>
<br>
<br><font size="2" face="sans-serif">Is someone able to look at the provided
mps files and give us any direction on a solution? The mps file can be
downloaded from the following link: </font><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__cqmshare.blob.core.windows.net_uploads_model3.mps-3Fst-3D2017-2D11-2D20T11-253A25-253A00Z-26se-3D2018-2D11-2D21T11-253A25-253A00Z-26sp-3Dr-26sv-3D2016-2D05-2D31-26sr-3Db-26sig-3DecTeCY-252BaqgbGr-252By7CHxw6p6jCWtIR9k2U02b3KT7CTg-253D&d=DwMBAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=pLOfVNEEHf-xhIqn1-uzYcZ6Q7UefG6Bg6rXCKTMiAA&m=rsB_EgOtUOY0p867fwcCxJ7fnELGGS7yCqMCLfw8eq0&s=eiTRmkXMeLQUydTAKNVV2hDrVgCI5vJvyb0okFn5BLg&e=" target="_blank"><font color="blue" size="2" face="sans-serif">https://cqmshare.blob.core.<wbr>windows.net/uploads/model3.<wbr>mps?st=2017-11-20T11%3A25%<wbr>3A00Z&se=2018-11-21T11%3A25%<wbr>3A00Z&sp=r&sv=2016-05-31&sr=b&<wbr>sig=ecTeCY%2BaqgbGr%<wbr>2By7CHxw6p6jCWtIR9k2U02b3KT7CT<wbr>g%3D</font></a>
<br>
<br><font size="2" face="sans-serif">Help is very much appreciated!</font>
<br>
<br><font size="2" face="sans-serif">Kind regards,</font>
<br>
<br><font size="2" face="sans-serif">Kevin van Blokland</font><br>______________________________<wbr>_________________<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><span style="font-family:monospace,monospace">=============================================================<br>Haroldo Gambini Santos<br>Computing Department<br>Universidade Federal de Ouro Preto - UFOP<br>email: haroldo [at ] <a href="http://iceb.ufop.br" target="_blank">iceb.ufop.br</a><br>home/research page: <a href="http://www.decom.ufop.br/haroldo/" target="_blank">www.decom.ufop.br/haroldo</a><br><br><br>It has long been an axiom of mine that the little things are infinitely<br>the most important.<br> -- Sir Arthur Conan Doyle, "A Case of Identity"<br></span></div></div></div>
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