On Wed, Mar 11, 2009 at 3:04 PM, Tracy Harms <[email protected]> wrote:
> CE: if "fork" weren't already in J, could you define it and use it
> conveniently?
>
> TH: No. J's verb trains (e.g. fork) allow separation-and-rejoining to
> be put in terms of functions, not structures of resulting values.
>
> My question to the J forum is: Have I erred or overlooked anything?
In other words, can we perform
(+/ % #)2 3 5
3.33333
without using verb trains?
I think we can:
serialized=: 1 :0
r=. 5!:5<'u'
if. 10 41-:a.i._2{.r do.
'((3!:2 a.{~',(":a.i.3!:1]5!:1<'u'),')5!:0)'
else.
'(',r,')'
end.
)
fork=: 1 :0
w=. u serialized
monad=. '(u y) ',w,' v y'
dyad=. '(x u y) ',w,' x v y'
2 : (monad;':';dyad)
)
+/ %fork # 2 3 5
3.33333
--
Raul
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