[Clp] resolve() after enableSimplexInterface()?

[Sebastian Theophil]

Hello,

 

in my program I do an initialSolve(), check the solution status and if
the solution is optimal I enable the simplex interface with
enableSimplexInterface(true).

 

Occasionally, the solver seems to change some internal solution status
that I do not quite understand: With the latest trunk, line 572 of
ClpSimplex.cpp calls  nonLinearCost_->checkInfeasibilities(). If I
understand correctly, this method checks each variables' status
including slack variables. In my case, calling
enableSimplexInterface(true) causes a status change for one variable
which leads to a change in the costs for this variable. By consequence,
this changes the value of my objective function.

 

Should a call to enableSimplexInterface be followed by a call to
resolve() to correct the solution?

 

Thanks in advance,

Sebastian


--
Sebastian Theophil . stheophil at think-cell.com
Software Engineer
 
think-cell Software GmbH . Invalidenstr. 34 . 10115 Berlin, Germany 
http://www.think-cell.com . phone +49-30-666473-10 . toll-free (US) +1-800-891-8091
Directors: Dr. Markus Hannebauer, Dr. Arno Schoedl . Amtsgericht Charlottenburg, HRB 85229

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/clp/attachments/20090304/ecdbf5f0/attachment.html>