not¶
Not zero
not x not[x]Returns 0b where x not equal to zero, and 1b otherwise.
Applies to all data types except symbol, and to items of lists, dictionary values and table columns, referring to the underlying data value.
Nulls and infinities never equal zero.
q)not -1 0 1 2
0100b
q)not "abc","c"$0
0001b
q)not `a`b!(-1 0 2;"abc","c"$0)
a| 010b
b| 0001b
q)not 2000.01.01 2020.06.30
10b
q)not 00:00:00
1b
q)not 12:00:00.000000000
0b
q)not (0W;-0w;0N)
000bAn atomic function.
not is a multithreaded primitive.
neg
Logic
Q for Mortals
ยง4.3.2 Not Zero not