hello everyone,

I have the following lines in my model:

set

i/1*400/;

alias(i,j);

binary variable x(i,j,k);

con(i,k)…sum((j)(ord(j) ne ord(i)),x(i,j,k))=E= sum((j)(ord(j) ne ord(i)),x(j,i,k)) ;

as you can see, I reversed the order of (i)&(j) in the variable x(i,j,k) to become x(j,i,k). for this constraint, I need to place (i) once in the first index for the first summation and in the second index for the second summation.

my question: is this syntax acceptable? in if not, what should I do to tackle this problem?

Thank you,