Hi,

I have a precedence constraint in my model s.t.

" forall (j in tasks, k in pre[j])

sum (i in stations) x[i][j]*i >= sum (i in stations) x[i][k]*i "

Here, for example,

for j=1, pre(j) should be empty.

for j=2, pre(j)=1

for j=3, pre(j)=1

for j=4, pre(j)=[2, 3]

and so on.

How can I put this constraint, the ranges (j, k) and the subset pre(j) in my model?

Thanks in advance,

------------------------------
Ceyhan
------------------------------

#DecisionOptimization

Hi

you can write

{int} pre[1..4]=[{},{1},{1},{2,3}];​

plus since you seem to need to schedule you should have a look at CPOptimizer within CPLEX



regards

------------------------------
[Alex] [Fleischer]
[EMEA CPLEX Optimization Technical Sales]
[IBM]
------------------------------