<html><head><meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"><META name="Author" content="Novell GroupWise WebAccess"></head><body style='font-family: Tahoma, sans-serif; font-size: 13px; '>Currently I am using Clp. But I also tried it with Xpress. It doesn't matter. I am using Bcp-1.2.3 and Bcp-1.3.4.<br><br>Andrea<br><br>>>> Sepehr Nemati Proon <sepehr.nemati@gmail.com> 12.08.12 14.21 Uhr >>><br>
<div><br>Which solver are you using?</div><div> </div><div>Sepehr NP</div><div><br> </div><div class="gmail_quote">On Fri, Aug 10, 2012 at 7:24 AM, Andrea Trautsamwieser <span dir="ltr"><<a href="mailto:andrea.trautsamwieser@boku.ac.at" target="_blank">andrea.trautsamwieser@boku.ac.at</a>></span> wrote:<br>
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<div>Hi,</div>
<div> </div>
<div>I want to use the dual variables for improving my algorithm, However, I found out that the dual solution does not equal the primal solution in each node, although it should. </div>
<div> </div>
<div>The termcode of the BCP_lp_result is 2, so it should be solved to optimality. I have tried to solve small test instances to check the error, however I have not find out what is going wrong exactly.</div>
<div> </div>
<div>The primal solution contains some of the new generated variables, but not all of the dual variables are adapted accordingly. It seems that the dual neglects at least one of the new algorithmic variables and so I obtain different objective values and the algorithmic variable is generated again in the next column generation iteration.</div>
<div> </div>
<div>Has anyone any idea to that problem?</div>
<div> </div>
<div>Thank you very much,</div>
<div> </div>
<div>Andrea</div>
<div> </div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Sepehr Nemati<br>PhD Student<br>Department of Industrial Engineering<br>University of Pittsburgh<br>
</sepehr.nemati@gmail.com></body></html>