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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.91Apr14120440@convx1.convx1.ccit.arizona.edu>
Date: 14 Apr 91 19:04:40 GMT
References: <31931@usc> <13APR91.22583472@uc780.umd.edu>
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In-reply-to: cs450a03@uc780.umd.edu's message of 13 Apr 91 22:58:34 GMT

In article <13APR91.22583472@uc780.umd.edu> cs450a03@uc780.umd.edu
(Raul Rockwell) writes:


   A Analla writes:

   >Could some please suggest a generic function to reorder each column
   >of an array in descending order where the array is two dimensional.
   >I would prefer the solution not be iterative and not require breaking
   >the columns into separate vectors.

   Well, in general, if you want to order the columns independently, you
   are already treating them as separate vectors.

   If you are using J, I'd suggest something like:
      \:"1&.|: array
   [... stuff deleted ]
I would think to add just a small ~ in front of array.  Without it, you
will get the permutations for such reorderings.

   Raul Rockwell

Incidentally, how does one write this function in APL2?

Eythan Weg