On 06/03/06, Andrew Makhorin <[EMAIL PROTECTED]> 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 _______________________________________________ Help-glpk mailing list Help-glpk@gnu.org http://lists.gnu.org/mailman/listinfo/help-glpk