[Coin-lpsolver] Variable values at iteration

[John J Forrest]

Edwin,

The cost of a post-solve might be so large that you would have been better
off solving the un-presolved problem.  I would see which bits of presolve
are effective - using stand-alone clp that would be clp file -poptions 1
-solve.  Then you may find that most actions are pretty simple and you can
work the post-solved answer easily.  If so then switch off other presolve
actions.  You do have access to the original column numbers from the
presolved problem.

John


                                                                           
             "Edwin Straver"                                               
             <edwin at solver.com                                             
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                                       [Coin-lpsolver] Variable values at  
                                       iteration                           
             05/18/06 08:11 PM                                             
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




   Hi All,

   I have a callback function that CLP calls at every iteration.


   I am getting the value of the objective at this point, but is it somehow
   possible to also get the "post solved" values for the variables at this
   point?


   I would not mind paying the overhead of doing a post-solve at every
   iteration. But I do need to be able to keep solving the model after
   every iteration....


   Is it possible to get these values?


   Greetings,


   Edwin Straver
   Email: edwin at solver.com
   Web: http://www.solver.com


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