Check bounds
x within y within[x;y]
Where
x is an atom or list of sortable type/sy is an ordered pair (i.e. (<). y is true), or the flip of a list of ordered pairs
of the same count and type/s as x, the result is a boolean for each item of x
indicating whether it is within the inclusive bounds given by y.
q)1 3 10 6 4 within 2 6
01011b
q)"acyxmpu" within "br" / chars are ordered
0100110b
q)select sym from ([]sym:`dd`ccc`ccc) where sym within `c`d
sym
---
ccc
ccc
within is a left-uniform function: its result conforms to its left argument.
q)5 within (1 2 6;3 5 7)
010b
q)2 5 6 within (1 2 6;3 5 7)
111b
q)(1 3 10 6 4;"acyxmpu") within ((2;"b");(6;"r"))
01011b
0100110b