<div dir="ltr"><div>Hi SCIP developers,<br><br></div>I'm Akang. I'm calling SCIP 5.0 through GAMS 25.0.2. (Attached is the gams file, CPLEX 12.8.0 is the LP solver). <br><br>My question is, SCIP generates the primal and dual bounds (Initial_status.PNG). We know that in the minimization problem, the primal bound is the upper bound (from a feasible solution). Why does SCIP check feasibility here
(Initial_status.PNG)?
After time limit is hit, why does SCIP further call IPOPT to find a feasible solution (and generate an upper bound in this case)? Then the primal bound is updated by a worse value from the IPOPT solution (status_update.PNG,
Also, what does the gap mean here because it is not (UB-LB)/UB?). <br><br>Could anybody elaborate on this?<br><div><div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr" style="color:rgb(136,136,136);font-size:12.8px">Akang Wang</div><div style="color:rgb(136,136,136);font-size:12.8px">Ph.D. Candidate</div><div style="color:rgb(136,136,136);font-size:12.8px">Department of Chemical Engineering</div><div style="color:rgb(136,136,136);font-size:12.8px">Carnegie Mellon University</div><div style="color:rgb(136,136,136);font-size:12.8px">5000 Forbes Avenue, Pittsburgh, PA 15213<br></div><div style="color:rgb(136,136,136);font-size:12.8px"><a href="mailto:akangw@andrew.cmu.edu" style="color:rgb(17,85,204)" target="_blank">akangw@andrew.cmu.edu</a></div><div style="color:rgb(136,136,136);font-size:12.8px"><a href="http://akangw.github.io" target="_blank">akangw.github.io</a></div></div></div></div></div></div></div></div></div>
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