Re: [Help-glpk] binary variables writing lp format; and MIP bounds

[arun gaikwad]

Binary Variables are special case of Integers with
Lower Bnd =  0 and Upper Bnd = 1
-Arun Gaikwad

--- Brady Hunsaker <address@hidden> wrote:

> 1.  A student I am working with noticed that when
> writing output in LP
> format, only "General" integer variables are
> specified, even if they are
> really binary variables.  Is there a reason for
> omitting the binary
> case?  If not, I'll go ahead and change the code and
> submit a possible
> correction.
> 
> 2.  IOS seems much better than the previous
> branch-and-bound solver.  I
> would like to improve the LP bound, however.  At
> present, the LP bound
> at the pseudo-root is used.  In fact, the maximum
> (or minimum) of the LP
> bounds at active nodes could be used and reported. 
> I would like to add
> this change as well as including a standard option
> for specifying an
> integrality gap for termination of the algorithm. 
> Is there any reason
> not to do this?
> 
> If there's no obvious reason not to, then I'll work
> on these changes and
> send them in,
> 
> Brady
> 
> -- 
> Brady Hunsaker
> Assistant Professor
> Industrial Engineering
> University of Pittsburgh
> http://www.engr.pitt.edu/hunsaker/
> 
> 
> 
> 
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