Originally posted by: yfful

Hi everyone, hope find you well.

I m new in Cplex, and I should use it to resolve a multi-period, multi-vehicle routing problem. The length of the planning horizon is 5 days, the time period is one day. At the beginning of the planning horizon, I know the set of customers to serve each day. My question is how to define the boolean decision variable x[t in days][k in vehicles][i in vertices ][j in vertices] equals 1 if vehicle k visits customer j immediately after customer i at day t, 0 otherwise.  Such that the subset of vertices includes the depot and only the visited customers in a given time period (not all customers).

Hi,

have you had a look at CPO ?

https://www.ibm.com/developerworks/community/forums/html/topic?id=556f341c-d349-4276-8e93-609d997cb129&ps=25

regards

Originally posted by: yfful

Thank you for your reactivity. I was looking to the link that you sent to me, but I think that It deals with a problem different from mine. To clarify more my question, please find attached the script that I developed. The attached program visits all hospitals each day of the planning horizon, which is not what i want. Indeed, I have as a given data, which hospitals to visit each day, as an example in day (1) I should visit the set of hospitals (2, 5, 10), in day (2) I should visit hospitals (7, 9) and so one. But I don't know how to introduce this information as an input of my program. I would sincerely appreciate your help.

Hi,

in

https://www.linkedin.com/pulse/model-building-oplcplex-alex-fleischer/

you could have a look at the example Milk Colection

https://www.ibm.com/developerworks/community/forums/html/topic?id=a03f60c3-0b5b-48f8-b622-c44944028363&ps=25

regards