Newsgroups: comp.lang.apl
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From: bli@lynx.cat.syr.edu (Bin Li)
Subject: Some Questions on J
Message-ID: <1992Jan27.024807.877@newstand.syr.edu>
Organization: Syracuse University
Date: Mon, 27 Jan 92 02:48:07 EST

Hi, I am learning J and would like to ask for help on the following questions:

(1) How to perform 2D convolution using J?  I have trouble understanding the 
ROTATE and SHIFT operations in J.

(2) How to extract a particular element in a two dimensional array?

(3) Given matrix M
1 2 3
4 5 6
    in APL, x/[2]M will produce
6 120
    How do I do this in J?

(4) How to order "Programming in J"?

Thank you.


Bin Li
Syracuse Univ.
