return - How to get observations as a list in Stata?

Question

Stata has r() macro for values that some commands return (return list after the command).

I need similar access to x after list x if y == 1, but list returns only r(N), not values themselves.

Is it possible to get the observations as a local or global macro to refer to it in the code?

Answer 1

Try levelsof command to get distinct values. It's the cat's pajamas.