On Wed, 2013-12-04 at 20:43 +0930, Sean Ma wrote: > Thanks very much for your quick reply. > > Sorry I did not provide my test case. Acutally, the generated LP file > from CPLEX 12.0 has the following empty constraint: > > Subject To > F1X.0: = 0 > > there is no variable in the constraint, that's why GLPK indicted an error. > > I think the previous form is common. If the RHS is not zero, then > during preprocessing, there problem will be detected infeasible. > > The reason I reported this as a bug to you because we have also used > many other LP/MIP solvers, all of them can read the above empty > constraint correctly. I was just wondering it might be reasonable to > consider the above form as acceptable. >
Now it is understood. IIRC the cplex manual I used says nothing about this option. Okay, I will change the lp reader in a next glpk release. Thank you. Andrew Makhorin _______________________________________________ Bug-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/bug-glpk
