Hi all,

I am working on a heterogeneous fleet routing problem. I have a decision variable with 4 indices: Xijtv. İt is a binary variable.

If type of t gets vehicle of v and it goes from i customer to j customer the value is 1.

There are 3 different types of vehicle and I express it with the A (t) parameter. Ex: There are 7 vehicles of the 3rd type.

A(t)

1 1

2 1

3 7

What I want to do here is that, when A (t) takes the value of 1, v is the set / 1 * 1 / or when A (t) takes the value of 3, v is the set of the set / 1 * 7 /.

Can you help me?