Operations Research Stack Exchange is a question and answer site for operations research and analytics professionals, educators, and students. It only takes a minute to sign up.
Sign up to join this community
I'm trying to implement the following in AMPL:
$$ i \in [N], j \in[N] \backslash \{i\}, t \in [T] $$
I have so far written the following:
subject to Con{i in PP,t in TT, j in PP : j != i}:
but it does not feel correct, is it? I also have a question about implementing this: $$ i \neq j,t $$ in a constraint, i'm only getting one to work:
subject to {i in PP,t in TT, j in PP : j != i}:
This looks most like the math (and avoids checking for every $(i,j,t)$ a logical condition that depends only on $i$ and $j$):
{i in PP, j in PP diff {i}, t in TT}
Try the following syntax:
subject to cons {i in PP,t in TT, j in PP : j diff i}:
Or
subject to cons {i in PP,t in TT, j in PP : j<>i}:
modelanddatasuch that they don't use the solve command. Then do adisplayon the set operations that you want to validate. example you could trydisplay {i in PP,t in TT, j in PP : j != i};to check if you are getting the correct selection from the sets. $\endgroup$ – prash Feb 1 '20 at 6:24