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Re: [Help-glpk] Setting Up Gap Tolerance in Gusek


From: Pietro Scionti
Subject: Re: [Help-glpk] Setting Up Gap Tolerance in Gusek
Date: Thu, 8 Apr 2010 00:12:42 -0700 (PDT)


Seung Mo Gu wrote:
> 
> 
> Oh, so I guess then there really is no "gap" per say. I was
> comparing my current best bound with the lp relaxation objective value.
> Thank you for clearing this up. It turns out the code at the time still
> had no feasible solution even after running for 60 hours. 
> 
> After modifying my model a bit, a few feasible solutions were found. I
> guess the question remains how one would go about accepting the current
> best solution when a certain gap is achieved. There seems to be many
> references made to glp_intopt but as I am new to GLPK/GUSEK I am confused
> on how to do this. 
> 
> 

Hi,
try using the option --mipgap 5 (or --mipgap 0.05, I don't remember) in the
parameters; the corresponding routine in the reference manual is
glp_ios_mip_gap. To open the parameters tab in GUSEK press Shift+F8 or click
View / Parameters.
Pietro
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