Originally posted by: SystemAdmin

Hi everyone,

I just started using the cplex optimizer, and I have this small problem to fix.

In my program I want to create an examination schedule.

This is a part of my input:

range Student = 1..NbStudents;
range Exam = 1..NbExams;
range Timeslot = 1..NbTimeslots;
{int} VaksStudent; // This is an array I assigned for each student containg the exams he/she has to undertake

I now have the following constraint:

forall(s in Student, e in Vaks[s])
ct:
sum(t in Timeslot)x[s][e][t]==1;

In this constraint I only look at the exams a student has to undertake in stead of looking at every exam.

Doing this I get the error: Constraint labeling not supported for dimensions with variable size.

But when I ignore the labeling I get a conflict while running the program saying that the constraint is unnamed and the constraints gets relaxed.

How can I solve this?

Regards,
#ConstraintProgramming-General
#DecisionOptimization

Hi,

in the documentation

IDE and OPL > Optimization Programming Language (OPL) > Language Reference Manual > OPL, the modeling language > Constraints > Constraint labels

you should have a look at the section

Labels and a variable size indexer

Regards
#ConstraintProgramming-General
#DecisionOptimization

Originally posted by: SystemAdmin

I was able to figure it out.

Thanks for the help!
#ConstraintProgramming-General
#DecisionOptimization