Hello.

I have been studying OPL for about two weeks, but I am not sure how to formulate a code for multi-period location problem.

I have formulated a code for the basic location problem, which works! and by fixing some of the code, i have to make it as a multi-period (t = 1,2,3) problem.

so the problem that I am having is that

when I use the data from the excel, my data's density should increase by 10 percent each year. (i am only doing for 3 periods)

1) First year's data = D

Second year's data = D*1.1

Third year's data = D*1.2

I tried to do it but I get the correct answer till the second year but in third year I get the value of D*1.32 which is D*1.1*1.2.

range Time = 0..2;

** what should i change to fix it?**

2) for the objective and constraint function, i need to maximize the number of patients for each period using limited number of ambulance in that specific period. So for period 1= 2, period 2 =3, period 3 =1.

What is the formulation of the iteration be like for this?

Also, for the objective function, I need to maximize the number of patients for each period, which requires double summation for each period.

how should i change from the code below?

maximize