[Help-glpk] Wrong optimal solution with Glpk-4.34

[ULDRY Marc]

Wrong optimal solution with Glpk-4.34Hello,

I have solved a MIP with 3 different solvers. Each solver gives an optimal 
solution after a few seconds.
I want to minimize the objective function value.

The optimal solution (objective function value) given by Glpk is greater than 
the optimal solution (objective function value) of the 2 other solvers (cplex 
12.2 and Gurobi 3.0.1) which have both the same objective function value.

Does anybody know the reason of this difference ?

You will find in attachment the model (problem.mod) and the data (problem.dat) 
of the problem and the LP file generated by Glpk from the *.mod and *.dat files 
(problem.lp) which has been solved by the 3 different solvers.

Thank you for your help.

Best regards.

Marc Uldry




Hello,

I have solved a MIP with 3 different solvers. Each solver gives an optimal solution after a few seconds.
I want to minimize the objective function value.

The optimal solution (objective function value) given by Glpk is greater than the optimal solution (objective function value) of the 2 other solvers (cplex 12.2 and Gurobi 3.0.1) which have both the same objective function value.

Does anybody know the reason of this difference ?

You will find in attachment the model (problem.mod) and the data (problem.dat) of the problem and the LP file generated by Glpk from the *.mod and *.dat files (problem.lp) which has been solved by the 3 different solvers.

Thank you for your help.

Best regards.

Marc Uldry

problem.dat
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problem.dat
Description: Binary data

problem.mod
Description: Binary data