equation

[vivianx]

how can i code this?

image.png (6.66 KiB) Viewed 968 times

[Fred]

E.g. as follows.

Code: Select all

eq(j)$[not sameas(j,'1')]..  sum((k,i)$[not sameas(i,j)], X(i,j,k)) =e= 1;

But instead of sharing a screenshot that provides no context, I suggest that you follow the forum rules and try to provide executable GAMS code (even if it has errors) that demonstrates where exactly you are struggling.

Best,
Fred