topic proc optmodel constraints restriction in Mathematical Optimization, Discrete-Event Simulation, and OR

proc optmodel constraints restriction

Yannic_Wera — Thu, 30 Apr 2020 17:54:45 GMT

Hello,

I want to combine two conditions to restrict constraint generation :

I try to avoid of having to products without setup timeslot and therefore I want to force that when it is another product the binary flag is force to be 0

con setsup {i in produit, j in produit , t in time : i<>j and t > 0} : periode_prod[i,t-1] + periode_prod[j,t] = 0 ;

the question is how to combine the two conditions following the : I'm not sure that the AND is working, I quite sure that it doesn't work

Thanks in advance

Yannic

Re: proc optmodel constraints restriction

RobPratt — Thu, 30 Apr 2020 18:42:49 GMT

The AND is correct, but "i<>j" means max(i,j). If you want to express that i is not equal to j, please use "i ne j" or "i ^= j" or " i ~= j" instead.

Re: proc optmodel constraints restriction

RobPratt — Fri, 01 May 2020 14:28:50 GMT

And here is an alternative approach:

con setsup {i in produit, j in produit diff {i}, t in time : t > 0} : periode_prod[i,t-1] + periode_prod[j,t] = 0 ;