Newsgroups: comp.lang.apl
Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!caen!news.cs.indiana.edu!maytag!watmath!ljdickey
From: ljdickey@watmath.waterloo.edu (L.J.Dickey)
Subject: Rank 0 catenation.
Message-ID: <1991Jun24.161151.12366@watmath.waterloo.edu>
Keywords: rank, catenate , array , box
Organization: University of Waterloo
Date: Mon, 24 Jun 1991 16:11:51 GMT
Lines: 41


Someone wrote recently asking about how to glue some given
arrays together to create certain specified results.
Here is the question.

 ========================= ========================== =========================
Suppose one is given the three arrays:

   a =. < " 0  m =. i. 2 3
   b =. < "(0) m + 12
   c =. < "(0) m + 24

How does one use these to create arrays d and e, whose displays are

   d
+----+----+----+
|0 12|1 13|2 14|
+----+----+----+
|3 15|4 16|5 17|
+----+----+----+
   e
+-------+-------+-------+
|0 12 24|1 13 25|2 14 26|
+-------+-------+-------+
|3 15 27|4 16 28|5 17 29|
+-------+-------+-------+
 ========================= ========================== =========================
   
I found that these expressions do the job:

   d =. a   ,"0  &. > b
   e =. d (,,"0) &. > c
  
My question is, do you know other ways of doing this?


-- 
Prof L.J. Dickey, Faculty of Mathematics, U of Waterloo, Canada N2L 3G1
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