2009/2/10 Matthew Brand <[email protected]>:
> Perhaps these are the things you want?
>
>   r =: 1 : '(u...@])"_1'
>   R =: @]
>
>   l =: 1 : '(u...@[)"_1'
>   L =: @[

Note that you could also have used
   r1=: (@])("_1)
   l1=: (@[)("_1)

r1 and l1 behave like r and l.

Another approach, which I think needs to
be explicit, would be:

   r2=: 1 :'u...@]"u'
   l2=: 1 :'u...@["u'

Here, the derived verb retains the rank of its
argument verb.

-- 
Raul
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