I am trying to implement the Rough Cut Capacity Planning for an school assignment. I currently have all constraints working except for the first constraint, since I do not know how I can loop over subset of time which is determined by two parameters release date(rj) and due date (dj).
+7
The easiest might be to consider making the set T a subset of integers.
You can then combine the r_j, d_j and value of t using a parameter indicating which t’s are relevant for each j and sum over those t’s using a so-called domain condition in AIMMS (using the | or such-that operator)
+5
constraint_1,
index domain: j
Definition: sum[t | t>= r(j) and t <= d(j), x(j, t) = 1]
Ultimately, it depends on how you declared the set T (is it a calendar of dates or weeks, or just a plain set of time periods {1, 2, … 5} ) and how the data for r(j) and d(j) is available - is it in same format of Set T or different ?
For example, if r(j) and d(j) are in dates but Set T is a calendar of weeks, then you will need helper functions as below. I suggest you also create a calendar of dates with the same format as r(j) and s(j), and declare these two as element parameters in this calendar.
sum[t | t >= Timeslotcharacteristic(r(j), ‘week’) and t <= Timeslotcharacteristic(d(j), ‘week’)), x(j, t) = 1]
Thank you for your answer
+7
You should have two parameters r and d that are indexed over the jobs j also.
Then in summations, you can use the | or such-that operator (look up domain conditions in the aimms manuals for more information) to sum over all times t such that a particular condition holds (e.g., in your case the t is between release and due date)
Already have an account? Login
Please use your business or academic e-mail address to register
No account yet? Create an account
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
Didn't find what you were looking for? Try searching on our documentation pages:
