.Q.def[]

Academy Support
1

https://learninghub.kx.com/forums/topic/q-def

trying to provide default parameters with the below statement:

d:.Q.def[`num1!5].Q.opt .z.x;


error as follows:


evaluation error:

type


[1]  (.Q.def)


[0]  d:.Q.def[`num1!5].Q.opt .z.x;

^


does .Q.def only takes in list or atoms such as the above is fine? Thanks.

2

Dictionaries require lists to be passed to either side of !. You can use enlist to make lists from atoms:

q)d:.Q.def[enlist[`num1]!enlist 5].Q.opt .z.x
q)d
num1| 5


If you are using kdb 4.1 you can use the new dictionary syntax which does not need enlist 

q)d:.Q.def[([num1:5])].Q.opt .z.x
q)d
num1| 5

3

thanks.

4

thanks!