RS> or tacitly:
RS> example=: (# ,:)&(i.2 3)
Why that hook? You can simply write
example =: #&(,: i. 2 3)
In case you wonder: in both lines, the parenthesized part on the
right will be computed into a simple noun at definition time.
Don't let that "i." confuse you when you ask J about "example":
example
#&(i.1 2 3)
This is just J's way of displaying a 2-row constant with a substitute
expression keeping things on a single line. There's no i.ing going on
when you invoke "example".
Martin
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