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From: weg@convx1.ccit.arizona.edu (Eythan Weg)
Newsgroups: comp.lang.apl
Subject: Re: WANTED: a way to sort array so each column i
Message-ID: <WEG.91Apr17130250@convx1.convx1.ccit.arizona.edu>
Date: 17 Apr 91 20:02:50 GMT
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In-reply-to: jaxon@sp27.csrd.uiuc.edu's message of 17 Apr 91 15:19:13 GMT

In article <1991Apr17.151913.4891@csrd.uiuc.edu> jaxon@sp27.csrd.uiuc.edu (Greg P. Jaxon) writes:


   cs450a03@uc780.umd.edu writes:

   >>Incidentally, how does one write this function in APL2?
   > you could write a function F to sort vector
   >then do:
   >         transpose mix  F each  split[quadIO] array
   >You might be able to do something with mix and brackets to avoid the
   >transpose, but I don't know what exactly, off the top of my head.
   >Raul Rockwell

   Easy mix[K] is the left inverse of split[K], so just  mix[#IO] F" split[#IO] A.

   Greg Jaxon

Is this solution correct?  Don't you have to insert a new first dimension
and therefore the axis for mix should be fractional?

Underlying my original question regarding the APL2 method is the sense
that you often need auxiliary functions where in J you can do without.
Is this a general feeling?  Now often you need a subroutine that in J
can be part of a main verb, not cluttering the workspace.  It pleases
me aesthetically that you can work this way.  I wonder if using
internal or external subroutines have different implications
regarding performance.


Eythan Weg