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<body class='hmmessage'><div dir='ltr'>I do not know an automatic way of doing that. <div><br></div><div>I usually build a second problem (to be solved if the original its infeasible) full of slacks on each constraint with very high cost on the objective function. The non-zero slacks gives clues of which is the problem. </div><div><br></div><div>Some times I run several problems changing the cost of the slacks if there are too much non zero.<br><br>I know it's not exactly what you looked at, but it has work for me on real problems. User found very useful to have a clue about what's wrong when the problem it's infeaseble and they are changing input data.<div><br></div><div>Kind regards.</div><div><br></div><div>David Ibarra </div><div><br></div><div><br><br><br><div>> To: cbc@list.coin-or.org<br>> From: christopher.gross@unikat.uni-augsburg.de<br>> Date: Mon, 30 May 2016 15:47:56 +0200<br>> Subject: [Cbc] How to debug infeasible problems<br>> <br>> Hi,<br>> <br>> I am using CBC in a software that generates models based on user input. <br>> Sometimes, users input invalid data leading to an infeasible model. As <br>> the amount of data they enter is not very small, it is often hard to see <br>> at a glance which data exactly causes the problem.<br>> <br>> Is it possible to configure CBC to output why a problem is infeasible? <br>> It would be great if it could give the line name where the conflict <br>> occurs, similar to what CPLEX does. I had a look around the config <br>> options, but could not find how to turn this on. Am I missing something <br>> or is this feature not available?<br>> <br>> Thanks and regards,<br>> <br>> Christopher<br>> -- <br>> Christopher Gross, M.Sc.<br>> <br>> Lehrstuhl für Health Care Operations/Health Information Management<br>> <br>> Universitäres Zentrum für Gesundheitswissenschaften am Klinikum Augsburg<br>> (UNIKA-T), Neusässer Straße 47, 86156 Augsburg;<br>> <br>> Wirtschaftswissenschaftliche Fakultät, Universität Augsburg,<br>> Universitätsstraße 16, 86159 Augsburg<br>> <br>> <br>> Tel.: +49 821 598-6454<br>> <br>> E-Mail: christopher.gross@unikat.uni-augsburg.de<br>> Web: http://www.wiwi.uni-augsburg.de/bwl/brunner/<br>> _______________________________________________<br>> Cbc mailing list<br>> Cbc@list.coin-or.org<br>> http://list.coin-or.org/mailman/listinfo/cbc<br></div></div></div> </div></body>
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