Originally posted by: M.Heshmat

Dear,

This error window appears after 15 seconds from running the model. What should I do to solve this problem?

Thank you.

Hi,

which cplex version do you use ?

Can you attach your model ?

regards

Originally posted by: M.Heshmat

Dear Alex,

Thank you for your reply.

I am using Cplex 12.2. Attached is the model.

Best Regards,

Mahmoud

Hi,

you could be hitting an out of memory issue.

I see in your model:

forall (i in Patients,k in Chairs)
    
{
      Constraint11:
       sum(i in Patients, j in Nurses, u in U11) y[i,j,k,u]<=1;

which looks strange because you do a loop on all patients i and then again on all patients i.

And then for all the constraints , why don t you compute U and P and then use a single constraint ?

Are you a researcher ?

regards

Originally posted by: M.Heshmat

Dear Alex,

Thank you very much for your beneficial remark in constraint 11. Indeed it is wrong, the right one is:

forall (k in Chairs)
    
{
      Constraint11:
       sum(i in Patients, j in Nurses, u in U11) y[i,j,k,u]<=1;

Regarding resolving constraint 11 and 12 with this brutal force way, I could not write them in a compact form. That is why I sent that problem in a previous question topic entitled by "Comparing two simple models", and I am waiting for a suggestion.

I am a student.

Thank you very much.

Best Regards,

Mahmoud