Re: Concatenation issue for atomic values

[rocuinneagain]

A single character .i.e “1” is a type -10h
A list of characters .i.e “10” is a type 10h
You can create a single character list using ‘enlist’ .i.e

q)type each ("1";"0";"11-15") /Some are lists some are not 
-10 -10 10h 
q)type each (enlist "1";enlist "0";"11-15") /All are lists 
10 10 10h 
q)("1";"0") 
"10" 
q)type each ("1";"0") 
-10 -10h 
q)(enlist "1";enlist "0") //Using enlist to make single character lists 
,"1" ,"0" 
q)type each (enlist "1";enlist "0") 
10 10h

Using ‘enlist’ will help prevent unwanted concatenation for you.
https://code.kx.com/q/ref/enlist/