There was a lot of improvements since 4.34,
I suppose chekcing the change log might help.
Perhaps. The problem was in Glpk-4.34.
I have downloaded and compiled the sources of Glpk-4.44 (last version).
I have tested many instances with this new version and all the optimal solutions are now correct and the same as optimal solutions given by CPLEX and Gurbobi.
On 01.10.10 11:13, "Yingjie Lan" <address@hidden> wrote:
> 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
Hi, how big is the difference? Could it be just a problem
caused by floating point precion?