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[Bug-glpk] GLPK reports wrong solution for MIP

From: Stefan Vigerske
Subject: [Bug-glpk] GLPK reports wrong solution for MIP
Date: Thu, 13 Sep 2007 08:39:27 +0400


for the attached model, GLPK 4.21 gives me a wrong solution.
CPLEX and CBC report 218.512850, but GLPK gives 197.55, and it's a 
minimization problem.
Fixing the variables to the reported integer solution and running GLPK 
on the resulting LP reports an infeasible problem (what is correct).

Maybe its a similar problem as reported last weak on the bug-glpk list, 
since the model is actually very bad scaled.


Stefan Vigerske
Humboldt University Berlin, Numerical Mathematics

Attachment: glpk_problem.mps
Description: Text document

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