There is no problem in cbc solver, the problem was in my code.<br>I've another question for you.<br>I'm solving big MIP problem and I'm using cbc solver as a standalone application.<br>How can I set cbc parameters to improve solver performance? There is a manual or a tutorial for this? I should try to solve big Mip problem in a reasonable time<br>Thanks<br><br><b><i>cbc-request@list.coin-or.org</i></b> ha scritto:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> Send Cbc mailing list submissions to<br> cbc@list.coin-or.org<br><br>To subscribe or unsubscribe via the World Wide Web, visit<br> http://list.coin-or.org/mailman/listinfo/cbc<br>or, via email, send a message with subject or body 'help' to<br> cbc-request@list.coin-or.org<br><br>You can reach the person managing the list at<br> cbc-owner@list.coin-or.org<br><br>When replying, please edit your Subject line so it is more specific<br>than "Re: Contents of
Cbc digest..."<br><br><br>Today's Topics:<br><br> 1. Re: mps error (John J Forrest)<br><br><br>----------------------------------------------------------------------<br><br>Message: 1<br>Date: Mon, 24 Sep 2007 10:21:56 -0400<br>From: John J Forrest <jjforre@us.ibm.com><br>Subject: Re: [Cbc] mps error<br>Cc: cbc@list.coin-or.org<br>Message-ID:<br> <OF2FCF0C84.1AF253EE-ON85257360.004E8E70-85257360.004EE996@us.ibm.com><br>Content-Type: text/plain; charset="us-ascii"<br><br>Thank you for sending me the mps file.<br><br>I am surprised that glpk had no problems solving the problem.<br><br>If you look at the mps file you sent you will see that row R0000092 is an <br>equality row with rhs of 0.0 and one element, a +1 in column C0002992. <br>C0002992 is fixed to 1in the bounds section so obviously the problem is <br>infeasible as reported.<br><br>John Forrest<br><br><br><br>Spring <springsender@yahoo.it> <br>Sent by: cbc-bounces@list.coin-or.org<br>09/21/2007 10:34
AM<br><br>To<br>cbc@list.coin-or.org<br>cc<br><br>Subject<br>[Cbc] mps error<br><br><br><br><br><br><br>Hi, <br>I'm trying to solve a Binary optimization problem by using both coin-or <br>cbc an glpk solver. In particular I'm using glpk to create the mps file <br>for the problem and cbc to solve it.<br>My optimization problem is the following: I'have 30 cars and 374 park rows <br>and I have to find the best parking.<br>I have choose to solve firstly the problem with 20 cars and all the park <br>rows, I've obtained the solution and now I want to solve the problem with <br>30 cars and all the rows by fixing to 1 the variables obtained like <br>results with 20 cars but when I give the generated mps file to cbc I've <br>the following error:<br>Model was imported from <br>D:/workspace/OptimizationProject/info/optimizationFiles/F2cv_ProblemDescription.mps <br>in 2.303 seconds<br>1 infeasibilities<br>Problem is infeasible - tightenPrimalBounds!<br><br>What's the problem?<br>I've
solved in the same way the problem with Glpk and I've no errors.<br><br>Thanks<br> L'email della prossima generazione? Puoi averla con la nuova Yahoo! Mail<br>_______________________________________________<br>Cbc mailing list<br>Cbc@list.coin-or.org<br>http://list.coin-or.org/mailman/listinfo/cbc<br><br>-------------- next part --------------<br>An HTML attachment was scrubbed...<br>URL: http://list.coin-or.org/pipermail/cbc/attachments/20070924/0bfe661b/attachment-0001.html<br><br>------------------------------<br><br>_______________________________________________<br>Cbc mailing list<br>Cbc@list.coin-or.org<br>http://list.coin-or.org/mailman/listinfo/cbc<br><br><br>End of Cbc Digest, Vol 5, Issue 3<br>*********************************<br></springsender@yahoo.it></OF2FCF0C84.1AF253EE-ON85257360.004E8E70-85257360.004EE996@us.ibm.com></jjforre@us.ibm.com></blockquote><br><p> 
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