From eperrone at kerchergroup.com Mon Apr 5 08:02:57 2021 From: eperrone at kerchergroup.com (Eric Perrone) Date: Mon, 5 Apr 2021 08:02:57 -0400 Subject: [Cbc] Questions Message-ID: Hello all, I have never been on this group before and I am a bit of a novice with CBC. I have a simple example of a model in a MPS file that I am trying to solve that CBC returns as infeasible. However, I was able to solve the problem using open solver in excel with CBC and also using Gurobi on the NeOS. Would it be appropriate for me to post the MPS for this problem here to ask for assistance as to why CBC in this case returns infeasible? Maybe there is something wrong with how the MPS file is written (although Gurobi did read it). If this is not the right forum for this could anyone point me to the correct place to ask for that help? Thanks so much in advance. *Eric* -------------- next part -------------- An HTML attachment was scrubbed... URL: From jajhall at ed.ac.uk Mon Apr 5 09:50:57 2021 From: jajhall at ed.ac.uk (Julian Hall) Date: Mon, 5 Apr 2021 14:50:57 +0100 Subject: [Cbc] Questions In-Reply-To: References: Message-ID: <7a910fa5-88d9-901a-63ae-4141c0295a81@ed.ac.uk> Dear Eric Intriguing: feel free to send the file if it's small enough, or a link to it if it's large. Thanks Julian This email was sent to you by someone outside the University. You should only click on links or attachments if you are certain that the email is genuine and the content is safe. Hello all, I have never been on this group before and I am a bit of a novice with CBC. I have a simple example of a model in a MPS file that I am trying to solve that CBC returns as infeasible. However, I was able to solve the problem using open solver in excel with CBC and also using Gurobi on the NeOS. Would it be appropriate for me to post the MPS for this problem here to ask for assistance as to why CBC in this case returns infeasible? Maybe there is something wrong with how the MPS file is written (although Gurobi did read it). If this is not the right forum for this could anyone point me to the correct place to ask for that help? Thanks so much in advance. Eric _______________________________________________ Cbc mailing list Cbc at list.coin-or.org https://list.coin-or.org/mailman/listinfo/cbc -- Julian Hall (Operational Research MSc Academic Selector) -- Dr. J. A. Julian Hall, Reader, School of Mathematics, University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, EDINBURGH, EH9 3FD, UK. Room: 5418 Phone: [+44](131) 650 5075 Email: J.A.J.Hall at ed.ac.uk Web: https://www.maths.ed.ac.uk/school-of-mathematics/people/a-z?person=47 [HiGHS] My working hours may not be your working hours. Do not feel pressure to reply to this email outside your working hours. The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. Is e buidheann carthannais a th? ann an Oilthigh Dh?n ?ideann, cl?raichte an Alba, ?ireamh cl?raidh SC005336. -------------- next part -------------- An HTML attachment was scrubbed... URL: From ted at lehigh.edu Mon Apr 5 10:12:13 2021 From: ted at lehigh.edu (Ted Ralphs) Date: Mon, 5 Apr 2021 10:12:13 -0400 Subject: [Cbc] Questions In-Reply-To: <7a910fa5-88d9-901a-63ae-4141c0295a81@ed.ac.uk> References: <7a910fa5-88d9-901a-63ae-4141c0295a81@ed.ac.uk> Message-ID: Hi Eric, Indeed, please do post the instance, but as we are in the process of winding down the mailing lists and moving to Github Issues/Discussions as our primary means of community interaction, it would be great if you could post it there instead of this mailing list. It sounds like more of an Issue than a Discussion, but feel free to choose either. If you need help figuring out how to do that, let us know. Cheers, Ted On Mon, Apr 5, 2021 at 9:51 AM Julian Hall wrote: > Dear Eric > > Intriguing: feel free to send the file if it's small enough, or a link to > it if it's large. > > Thanks > > Julian > > This email was sent to you by someone outside the University. > You should only click on links or attachments if you are certain that the > email is genuine and the content is safe. > > Hello all, > > > > I have never been on this group before and I am a bit of a novice with > CBC. I have a simple example of a model in a MPS file that I am trying to > solve that CBC returns as infeasible. However, I was able to solve the > problem using open solver in excel with CBC and also using Gurobi on the > NeOS. Would it be appropriate for me to post the MPS for this problem here > to ask for assistance as to why CBC in this case returns infeasible? Maybe > there is something wrong with how the MPS file is written (although Gurobi > did read it). If this is not the right forum for this could anyone point me > to the correct place to ask for that help? > > > > Thanks so much in advance. > > > > > > *Eric* > > _______________________________________________ > Cbc mailing listCbc at list.coin-or.orghttps://list.coin-or.org/mailman/listinfo/cbc > > -- > > Julian Hall (Operational Research MSc Academic Selector) > -- > Dr. J. A. Julian Hall, Reader, School of Mathematics, > University of Edinburgh, James Clerk Maxwell Building, > Peter Guthrie Tait Road, EDINBURGH, EH9 3FD, UK. > Room: 5418 Phone: [+44](131) 650 5075 Email: J.A.J.Hall at ed.ac.uk > Web: https://www.maths.ed.ac.uk/school-of-mathematics/people/a-z?person=47 > [image: HiGHS] > My working hours may not be your working hours. Do not feel pressure to > reply to this email outside your working hours. > The University of Edinburgh is a charitable body, registered in Scotland, > with registration number SC005336. Is e buidheann carthannais a th? ann an > Oilthigh Dh?n ?ideann, cl?raichte an Alba, ?ireamh cl?raidh SC005336. > _______________________________________________ > Cbc mailing list > Cbc at list.coin-or.org > https://list.coin-or.org/mailman/listinfo/cbc > -- Dr. Ted Ralphs Professor, Industrial and Systems Engineering Lehigh University (610) 628-1280 ted 'at' lehigh 'dot' edu coral.ie.lehigh.edu/~ted -------------- next part -------------- An HTML attachment was scrubbed... URL: