Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!bu.edu!wang!wdr
From: wdr@wang.com (William Ricker)
Newsgroups: comp.lang.apl
Subject: Re: Rank 0 catenation.
Message-ID: <b7mykb.n3a@wang.com>
Date: 26 Jun 91 17:14:34 GMT
References: <1991Jun24.161151.12366@watmath.waterloo.edu> 	<ROCKWELL.91Jun24202553@socrates.umd.edu> <ROCKWELL.91Jun24223131@socrates.umd.edu>
Organization: Wang Labs, Lowell MA, USA
Lines: 29

rockwell@socrates.umd.edu (Raul Rockwell) writes:
>	e =. ,&.>/ a,b,c
>but that won't work.  This should work:
>   e =. a ,&.> b ,&.> c

Nope.  That also gives 
+---------------+---------------+---------------+
|0 3 12 15 24 27|1 4 13 16 25 28|2 5 14 17 26 29|
+---------------+---------------+---------------+
 
To insert (,&.>) between three arrays of similar size, you can
   ]    e =. ,&.> /   >  a;b;<c

which has the desired result of 

+-----------------------+
|0 12 24|1 13 25|2 14 26|
+-------+-------+-------|
|3 15 27|4 16 28|5 17 29|
+-----------------------+

(The close or box < on c is needed since c is alread boxed, and thus
 won't get the extra layer needed for symmetry from ; for free; we
 then discard one layer of box  and work under the other.)

-- 
/s/ Bill Ricker                wdr@wang.wang.com 
"The Freedom of the Press belongs to those who own one."
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