why it reports error with && in case below:
sum((change_cost[k,l,j]*C[k,l,j,t,t+1]) for k in F, l in F, j in U, t in TIME: (t<=length(TIME)-1) && (k != l))
Please make it easier to help you
My guess is it has to do with
TIME:, or with some of those parentheses. Something there is invalid syntax.
I’m not exactly sure how it tried to parse it but the problem is almost certainly with
:, where you probably want
great, if is the solution.
Thank you both.