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!