Path: utzoo!utgpu!watserv1!watmath!mks.com!tslwat!louk
From: louk@tslwat.UUCP (Lou Kates)
Newsgroups: comp.lang.apl
Subject: Re: Questions about J.
Message-ID: <343@tslwat.UUCP>
Date: 10 Jan 91 04:32:15 GMT
References: <15160009@hpdmd48.boi.hp.com> <1991Jan9.171347.19535@jato.jpl.nasa.gov>
Reply-To: louk@tslwat.UUCP (Lou Kates)
Organization: Teleride Sage, Ltd., Waterloo
Lines: 22



In article <1991Jan9.171347.19535@jato.jpl.nasa.gov> sam@kalessin.jpl.nasa.gov (Sam Sirlin) writes:
#In article <15160009@hpdmd48.boi.hp.com>, rrr@hpdmd48.boi.hp.com (Rudi Rynders) writes:
#|> OK, how DOES one catenate two m-rowed arrays in the "horizontal" direction in J?
#|> A pretty basic question , I admit. But why is it so hard to find?
#|> 
#
#I've not been able to find a way to do the equivalent of reassignment:
#
#  A[I] .is X
#
#in J. Is this really impossible? Doesn't this make it hard to do some things
#that FORTRASH even does easily (such as setting up similar arrays)? Or 
#

More generally, it would be nice for any APLer trying to learn J if there
were a description of each APL expression in terms of the corresponding
J expression.

Lou Kates, Teleride Sage Ltd., louk%tslwat@watmath.waterloo.edu
416-596-1940 ext. 210