### Network design with GAMS

Posted:

**Fri Jun 18, 2021 1:29 pm**Hello!

I'm new to GAMS and I'm still learning the basics. I have a model to implement in which one of the sets (T) includes the indices t and t'. Am I supposed to define the set normally or is there some particularity? The model has several variables that consider both indices (t and t'). How can I implement a constraint like the following:

A(khptt') = B(pht,t'-1) + k-sum of C(khptt') - k-sum of D(khptt') for all p, h, and t smaller than t'

?

Thanks to whoever can help me!

I'm new to GAMS and I'm still learning the basics. I have a model to implement in which one of the sets (T) includes the indices t and t'. Am I supposed to define the set normally or is there some particularity? The model has several variables that consider both indices (t and t'). How can I implement a constraint like the following:

A(khptt') = B(pht,t'-1) + k-sum of C(khptt') - k-sum of D(khptt') for all p, h, and t smaller than t'

?

Thanks to whoever can help me!