[Coin-symphony] Warm Start Problems

[Menal Guzelsoy]

Dave,

Can you send me the mps file? I will take a look at that.

Menal.

Quoting David Goodlad <dgoodlad at gmail.com>:

> Hi all
>
> I am working on a solver that uses the warm start functionality to
> analyze multiple objective functions for the same problem.  However,
> there seems to be one case where it inexplicably fails.
>
> In one problem, it happens that the optimal solution with the first
> objective function is found in the root node (after about 500
> iterations).  When I then set up the second objective function, load
> the warm start data from the last run, and run sym_warm_solve, it
> complains that the problem is infeasible!  I know, however, that if I
> set the initial objective function to something else which causes more
> than one node to be treated, the second objective function (same one
> as before) works just fine.
>
> I've had to setup a workaround for now testing for only 1 node being
> treated, but this is ugly.  Is there a specific reason for this
> behavior?
>
> Thanks in advance,
> Dave
>
> -- 
> Dave Goodlad
> dgoodlad at gmail.com or dave at goodlad.ca
> http://david.goodlad.ca/
>
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>



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