Originally posted by: SystemAdmin

[osta said:]

Hi everyone,
Sometimes an linear program has multiple optimal solutions due to zero dual variables. After optimization done, OPL asks for next solution. But it displays always the same optimal solution.
I wonder how to obtain another optimal solution in OPL?
Thanks in advance.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[jfk said:]

which version of OPL are you using?
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[osta said:]

I am using OPL 3.1 with Cplex7.0
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[osta said:]

I forgot to mention that the problem is a mixed integer program that uses MIP optimizer.
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[alain.chabrier said:]

Hi,

if this is possible, I would highly recommend you upgrade to a more recent version.

OPL3.1 is probably almost 6-7 years old.

Current version is OPL 6.1.1

Alain
#DecisionOptimization
#OPLusingCPLEXOptimizer

Originally posted by: SystemAdmin

[osta said:]

Many thanks Alain!
But no matter what is the version of OPL, is it possible to display other optimal solutions (if any), when we use OPL with Cplex?

#DecisionOptimization
#OPLusingCPLEXOptimizer