sel:{$[`~y;x;select from x where sym in y]} / from u.q
My understanding is that sel returns x unless you enter a y?
If this is the case, could we not have used “x” instead of “sel” in pub?
pub:{[t;x]{[t;x;w]if[count x:selw 1;(neg first w)(`upd;t;x)]}[t;x]each w t}
Hi,
The selw 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