<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class=""><div class=""><div class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">Le 16 févr. 2017 à 16:59, Ted Ralphs <<a href="mailto:ted@lehigh.edu" class="">ted@lehigh.edu</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=""><div class=""><div class="">Hi Romain,<br class=""><br class="">What's the version of DipPy you are using? How are you reading the problem into DipPy? Are you able to share the Python script you're using?<br class=""><br class=""></div>Cheers,<br class=""><br class=""></div>Ted<br class=""><div class=""><div class=""><br class=""><br class=""></div></div></div><div class="gmail_extra" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><br class=""><div class="gmail_quote">On Thu, Feb 16, 2017 at 2:04 PM, Romain Montagné<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:romain.montagne@polymtl.ca" target="_blank" class="">romain.montagne@polymtl.ca</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div style="word-wrap: break-word;" class="">Hello Ted,<div class=""><br class=""></div><div class="">I am using DIP as a generic solver. I have simply created a dippy.DipProblem that I solve with and without the doPriceCut option, like in the examples that are provided. </div><div class=""><br class=""></div><div class="">I have attached 4 files:</div><div class=""><br class=""></div><div class="">- LP.lp is the .lp file</div><div class="">- LP_blocks.txt is the block file </div><div class="">- DoPriceCut0_terminal_output.<wbr class="">txt is what I see on my screen when I solve the problem without the doPriceCut option (and it works fine)</div><div class="">- DoPriceCut1_terminal_output.<wbr class="">txt is what I see on my screen when I solve it with the doPriceCut option (and it tells me problem infeasible)</div><div class=""><br class=""></div><div class="">The version of DIP that I am using is 1.4.8. I work on a linux 64 bit machine, and my compiler is gcc, version 4.4.7.</div><div class=""><br class=""></div><div class="">If you need other information please let me know.</div><div class=""><br class=""></div><div class="">Thank you very much for your help,</div><div class=""><br class=""></div><div class="">Romain</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""></div></div><br class=""><div style="word-wrap: break-word;" class=""><div class=""></div></div><br class=""><div style="word-wrap: break-word;" class=""><div class=""></div></div><br class=""><div style="word-wrap: break-word;" class=""><div class=""></div></div><br class=""><div style="word-wrap: break-word;" class=""><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">Le 16 févr. 2017 à 11:38, Ted Ralphs <<a href="mailto:ted@lehigh.edu" target="_blank" class="">ted@lehigh.edu</a>> a écrit :</div><br class="m_9014207209334939799Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class="">Hi Romain,<br class=""><br class="">Are you using DIP as a generic solver or have you built an application? Can you send the .lp file and the block file, as well as other information, such as version number, platform, compiler, etc.? I would like to try and replicate this.<br class=""><br class=""></div>Cheers,<br class=""><br class=""></div>Ted<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Feb 9, 2017 at 6:36 PM, Romain Montagné<span class="Apple-converted-space"> </span><span dir="ltr" class=""><<a href="mailto:romain.montagne@polymtl.ca" target="_blank" class="">romain.montagne@polymtl.ca</a>></span><span class="Apple-converted-space"> </span>wrote:<br class=""><blockquote class="gmail_quote" style="margin: 0px 0px 0px 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex;"><div style="word-wrap: break-word;" class="">PS: After saying the problem is infeasible, I get the following error: <span style="font-family: 'Source Sans Pro', sans-serif; font-size: 14px; background-color: rgba(123, 123, 123, 0.0980392);" class="">"Segmentation fault (core dumped)"</span><div class=""><div class="m_9014207209334939799h5"><div class=""><br class=""></div><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">Le 9 févr. 2017 à 17:45, Romain Montagné <<a href="mailto:romain.montagne@polymtl.ca" target="_blank" class="">romain.montagne@polymtl.ca</a>> a écrit :</div><br class="m_9014207209334939799m_-7755450750370568469Apple-interchange-newline"><div class=""><div style="word-wrap: break-word;" class="">Hello DIP community,<div class=""><br class=""></div><div class="">I am using Dippy to solve a MILP. I want to compare branch-and-bound and branch-and-price performances. </div><div class=""><br class=""></div><div class="">When I solve the problem with branch-and-bound (i.e., with the option <font class=""><font face="Menlo" class=""><font color="#272ad8" class=""><span style="font-size: 11px;" class="">‘doPriceCut’ </span></font></font><font class="">set to 0), it works great. But when I activate the </font></font><span style="color: rgb(39, 42, 216); font-family: Menlo; font-size: 11px;" class="">‘doPriceCut’ </span>option for branch-and-price, it tells me the problem is infeasible. </div><div class=""><br class=""></div><div class="">Does anyone know what is happening? </div><div class=""><br class=""></div><div class="">I have looked at the .lp file as well as the block file and they look ok.</div><div class=""><br class=""></div><div class="">Any help is greatly appreciated.</div><div class=""><br class=""></div><div class="">Cheers,</div><div class=""><br class=""></div><div class="">Romain Montagné, PhD </div></div></div></blockquote></div><br class=""></div></div></div></div><br class="">______________________________<wbr class="">_________________<br class="">Dip mailing list<br class=""><a href="mailto:Dip@list.coin-or.org" target="_blank" class="">Dip@list.coin-or.org</a><br class=""><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=" rel="noreferrer" target="_blank" class="">https://urldefense.proofpoint.<wbr class="">com/v2/url?u=http-3A__list.coi<wbr class="">n-2Dor.org_mailman_listinfo_<wbr class="">dip&d=CwICAg&c=Ngd-ta5yRYsqeUs<wbr class="">EDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&<wbr class="">r=rnUB298ByR5BGgo6vv2b6g&m=SQ6<wbr class="">EyINjMS0JVGwJJandNupwBLGNKe61E<wbr class="">n7rTWKugOY&s=-XIQIHlDQ8zaq0_-<wbr class="">XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=</a><span class="Apple-converted-space"> </span><br class=""></blockquote></div><br class=""><br clear="all" class=""><br class="">--<span class="Apple-converted-space"> </span><br class=""><div class="m_9014207209334939799gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class="">Dr. Ted Ralphs<br class="">Visiting Researcher, Zuse Institute Berlin<br class="">Professor, Lehigh University<br class=""><a href="tel:(610)%20628-1280" value="+16106281280" target="_blank" class="">(610) 628-1280</a><br class="">ted 'at' lehigh 'dot' edu<br class=""><a href="http://coral.ie.lehigh.edu/~ted" target="_blank" class="">coral.ie.lehigh.edu/~ted</a><br class=""></div></div></div></div></div></div></blockquote></div><br class=""></div></div><br class=""></blockquote></div><br class=""><br clear="all" class=""><br class="">--<span class="Apple-converted-space"> </span><br class=""><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class="">Dr. Ted Ralphs<br class="">Visiting Researcher, Zuse Institute Berlin<br class="">Professor, Lehigh University<br class="">(610) 628-1280<br class="">ted 'at' lehigh 'dot' edu<br class=""><a href="http://coral.ie.lehigh.edu/~ted" target="_blank" class="">coral.ie.lehigh.edu/~ted</a></div></div></div></div></div></div></blockquote></div><br class=""></div></div></div></body></html>