Re: What is the purpose of the underscore in this line of u.q

[pmallon]

Hi,

it is drop in place to modify the dictionary w of table subscriptions. It is checking the list of subs for table x, for handle y, if there is an item its dropped from the list and w[x] is updated.

section at the bottom here on drop in place:

Drop in place

Assign through Drop to delete in place.

q)show d:`a`b`c`x!(1;2 3;4;5) 

a| 1 
b| 2 3 
c| 4 
x| 5 

q)d _:`x 
q)d 
a| 1 
b| 2 3 
c| 4

Hope that helps, if not let me know.