Hi everyone,
I am learning GAMs to solve a NLP model. I want to specify that the local demand is prioritized before the warehouse can be used for stores in other region. so how to express Xii>=Xij in gams? I was trying to use the following
set i 'warehouse' /1*3/;
alias(i,j); *each warehouse is assigned to each local store for replenishment, so the set for warehouse and store is the same
variable
x(i,j) 'warehouse i is used to replenish demand for store j';
eq(warehouse).. X(''i,i'') =ge= X(''i,j'')$i ne j;
how can i correct this to express Xii>=Xij while i is not equal to j? Thank you a million for your help!
Xii >= Xij how to code in GAMS

Online
 User
 Posts: 75
 Joined: 2 years ago
 Location: Rosario  Argentina
Re: Xii >= Xij how to code in GAMS
Hi, it's simple
set i warehouse /1*3/;
alias(i,j);
eq(i,j)$(ord(i) ne ord(j)).. X(i,i) =g= X(i,j);
Bye
set i warehouse /1*3/;
alias(i,j);
eq(i,j)$(ord(i) ne ord(j)).. X(i,i) =g= X(i,j);
Bye
Re: Xii >= Xij how to code in GAMS
Hi Really appreciate your help! Have a good dayManassaldi wrote: ↑8 months agoHi, it's simple
set i warehouse /1*3/;
alias(i,j);
eq(i,j)$(ord(i) ne ord(j)).. X(i,i) =g= X(i,j);
Bye