<div dir="ltr">Dear SCIP team,<div><br></div><div>I'm working on a typical pricing problem. I've two formulations: one is solved with a Branch & Price and the other one with a typical Branch & Bound, both using SCIP.</div><div>I have a problem with collecting the LP Root for the second one. Indeed, I would like the LP-Relaxation objective value of my problem and not the transformed one, or any other solution obtained in the root node.</div><div><br></div><div>For example, in the trace bellow, the LP-Relaxation objective value for an instance of my formulation is 1.041834e+04 (the MIP optimal is found before any branching).</div><div><br></div><div> time | node | left |LP iter|LP it/n| mem |mdpt |frac |vars |cons |cols |rows |cuts |confs|strbr| dualbound | primalbound | gap <br></div><div><div>T 0.0s| 1 | 0 | 0 | - | 248k| 0 | - | 10 | 20 | 10 | 20 | 0 | 0 | 0 | -- | 0.000000e+00 | Inf </div><div> 0.0s| 1 | 0 | 13 | - | 246k| 0 | 2 | 10 | 20 | 10 | 20 | 0 | 0 | 0 | 1.041834e+04 | 0.000000e+00 | Inf </div><div>s 0.0s| 1 | 0 | 13 | - | 247k| 0 | 2 | 10 | 20 | 10 | 20 | 0 | 0 | 0 | 1.041834e+04 | 3.029395e+03 | 243.91%</div><div> 0.0s| 1 | 0 | 16 | - | 248k| 0 | 0 | 10 | 20 | 10 | 21 | 1 | 0 | 0 | 9.957000e+03 | 3.029395e+03 | 228.68%</div><div>* 0.0s| 1 | 0 | 16 | - | 248k| 0 | - | 10 | 20 | 10 | 21 | 1 | 0 | 0 | 9.957000e+03 | 9.957000e+03 | 0.00%</div></div><div><br></div><div>If I use any function to obtain the LPRoot value (<i>SCIPgetLPRootObjval</i>, <i>SCIPgetLPRootObjval</i> or <i>SCIPgetLowerboundRoot</i>) I logically get 9.957000e+03. If I use <i>SCIPgetSolOrigObj</i> I obtain the same and not the 1.041834e+04 of the LP relaxation of my original problem.</div><div><br></div><div>Also, because I want to compare the two formulations, and then to compare what is comparable, I would like to know what are the different algorithms executed in the root. If I try to understand: the T and s mean two heuristics has been used and * means normally an integral LP-relaxation (but not for my original problem).</div><div><br></div><div>Thanks :)</div><div><br></div><div>Samuel Deleplanque</div><div><br></div><div>-- <br><div class="gmail_signature"><div dir="ltr"><div style="font-family:arial"><span style="color:rgb(68,68,68);font-family:'courier new',monospace"><font size="1">/***************************************</font></span><br></div><div style="font-family:arial"><font size="1"><span style="color:rgb(68,68,68);font-family:'courier new',monospace">Samuel Deleplanque, PHD</span><span style="font-family:'courier new',monospace"><font color="#000000"><b><br></b></font></span></font></div><div style="font-family:arial"><span style="font-family:'courier new',monospace"><font color="#000000" size="1"><b>PostDoc at <i>Université Libre de Bruxelles</i></b></font></span></div><div style="font-family:arial"><font size="1"><b style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify">Phone:</b><span style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify"> +32 (0) 2 650 5628, </span><b style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify">Fax:</b><span style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify"> +32 (0) 2 650 5970</span></font></div><div style="font-family:arial"><font size="1"><span style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify"></span><span style="font-family:OpenSans,Tahoma,Arial,Verdana;line-height:17px;text-align:justify"><b>Office:</b> 2.N3.206 - Building NO, <span style="color:rgb(0,0,0);font-family:arial;line-height:normal">Campus de la Plaine</span></span></font></div><div style="font-family:arial"><font color="#000000" size="1">Boulevard du Triomphe CP 210 / 01<br></font></div><font size="1"><font color="#000000" style="font-family:arial">B-1050 <b>Brussels</b>, <b>Belgium </b></font><b style="font-family:arial;color:rgb(0,0,0)"><i><a href="http://sites.google.com/site/samueldeleplanque/" target="_blank">Website</a></i></b></font><div style="font-family:arial"><span style="color:rgb(68,68,68);font-family:'courier new',monospace"><font size="1">****************************************/</font></span></div></div></div></div><div>
</div></div>