Re: [Help-glpk] Can't read CPLEX file

[Paulo J. Matos]

On 06/03/06, Andrew Makhorin <address@hidden> wrote:
> > I currently have GLPK 4.9 installed and the following CPLEX file:
> > maximize 1
> > st
> > - 2 x1 - 3 x2 <= -1
> > 2 x1 + 3 x2 <= 1
> > - 1 x1 - 1 x2 <= -4
> > 1 x1 + 1 x2 <= 4
> > bounds
> > x1 free
> > x2 free
> > end
> >
> > Cplex can read it.
> > glpsolve:
> > $ glpsol --cpxlp test.lp
> > lpx_read_cpxlp: reading problem data from `test.lp'...
> > test.lp:2: missing variable name
> > CPLEX LP file processing error
> >
> >
> > Why?
>
> Because there is a syntax error in maximize statement. Note that
> glpk does not support some features allowed in recent versions of
> cplex format, in particular, constant terms in the objective.
> For details about compatibility please consult the glpk reference
> manual (Appendix C "CPLEX LP Format", pp.79-84).
>
> If you need only a feasible solution, simply specify any variable
> as the objective, for example:
>
>    maximize x1
>
>

Thanks, and is it possible to have it output the solution found?
I searched --help flag but found nothing.

Paulo Matos

>
>


--
Paulo Jorge Matos - pocm at sat inesc-id pt
Web: http://sat.inesc-id.pt/~pocm
Computer and Software Engineering
INESC-ID - SAT Group