Re: Why do we use sel[x] here in u.q, could we not have just used x?

[pmallon]

Hi,

The sel[x]w 1 , call is the same as sel[x;w 1].  So, y =w 1, which will be a list of symbols or ` if no filtering on syms is to be applied.
Then within sel function, filtering is applied if y is not equal to `  with the select from x where sym in y.

Omitting sel from the pub function would remove this functionality to subscribe to a subset of syms.

Let me know if this helps or not.

Patrick