Re: [Help-glpk] Problem infeasibility

[Spring]

Hi Andrew, 
the situation is the following:
I've a Mip problem with some binary variables and some fixed variables. I created an MPS file to describe problem by using glpk library (java interface 4.8) and I used the MPS file generated as input file for glpsol...the result is "PROBLEM HAS NO PRIMAL FEASIBLE SOLUTION".
Anyway the problem is not infeasible because if I create the MPS file by using Cplex, glpsol find the OPTIMAL SOLUTION..

Where is the problem and how can I solve it?

Thanks in advance


Andrew Makhorin <address@hidden> ha scritto:
>  > Hi, I'm trying to solve a feasible problem, by using glpsol and I
> > obtained the following results:
>
> > lpx_read_mps: reading problem data from
> > `D:/workspace/OptimizationProject/info/optimizationFiles/F2cv_ProblemDescription.mps'...
> >  
>  lpx_read_mps: problem name not specified
> >   lpx_read_mps: 14474 rows, 11220 columns, 520172 non-zeros
> >   lpx_read_mps: 11220 integer columns, 11200 of which are binary
> >   lpx_read_mps: 295790 cards were read
> >   PROBLEM HAS NO PRIMAL FEASIBLE SOLUTION
>
> >   I don't think what's the problem...Can you help me?
>
> Try using the option `--nopresol' to disable the lp presolver.
> If no fasible solution will be found, most probably, your lp is really
> infeasible, in which case you can obtain additional information from
> the solution output sheet.

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