Decision Optimization

Hello,

I am new to CPLEX and trying to write a model for flexible job shop scheduling problem (MIP). However, I am not able to define the sets and variables given below:

SETS:

Oi ->ordered set of operations of job i (Oi C O), where Oif(i) is the first and Oif(l) is the last element of Oi
Mj  ->the set of alternative machines on which operation j can be processed, (Mj C M)
Mj n Mj' -> the set of machines on which operations j and j' can be processed  (this set will be used as a domain for variable below and some constraints)

DECISION VARIABLE:

Yiji'j'k  = 1, if operation Oij precedes operation Oi'j' on machine k; 0, otherwise

I tried to define a tuple as given in attachment. But I couldn't find a way to read processing time from this tuple to use in the constraint I shared.I also added a screenshot for sets and decision variables. I need your help. Thank you.

Dear Zgeg,

To access a tuple field, you should use the dot (.) notation. 

For instance:

tuple Point {
int x;
int y;
};

Point p = <2,3>;
int x = p.x; // here you use the (.) notation to access the field of the tuple.

For more information, please consider reading: https://www.ibm.com/docs/en/icos/22.1.1?topic=structures-tuples

I hope this helps.

Cheers,