joining strings kdb+

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1

https://learninghub.kx.com/forums/topic/joining-strings-kdb

why does joining these 2 strings give unexpected results?
-> system"pwd" = and the type is 0h as well
-> (system"pwd"),"/xyz.csv" //type of first string is 0h and type of "xyz.csv" is 10h as expected

2

https://code.kx.com/q/ref/system/ "returns the result as a list of character vectors."


Returns a list (0h) of character vectors (10h).


q)type system"ls -l"

0h

q)count system"ls -l"

28



q)type system"pwd"

0h

q)count system"pwd"

1

q)first system"pwd"

"/Users/myuser"

q)type first system"pwd"

10h

q)(first system"pwd"),"/some"

"/Users/myuser/some"

3

It's joining a list (of lists) to another list (of characters)

q)(system"pwd"),"/xyz.csv"
"/home/rocuinneagain"
"/"
"x"
"y"
"z"
"."
"c"
"s"
"v"

To join a list of lists to another list of lists add 'enlist'

q)(system"pwd"),enlist "/xyz.csv"
"/home/rocuinneagain"
"/xyz.csv"

To add a list of characters to a list of characters use 'first'

q)(first system"pwd"),"/xyz.csv"
"/home/rocuinneagain/xyz.csv"