No, it isn't.
Roger Hui wrote:
x,[_0.5] y in APL is equivalent to x,:y in J.
----- Original Message -----
From: PackRat <[EMAIL PROTECTED]>
Date: Thursday, June 12, 2008 6:11
Subject: [Jprogramming] Bracket APL-to-J question
To: Programming forum <[email protected]>
I wasn't sure which forum was the best for this kind of APL-to-J
programming question, so I thought I'd try it here. If
that's not
correct, please let me know, so that I can submit any future
questions
along this line to the appropriate forum.
I have a master's degree in music, and one of the main reasons
behind
my learning J is to translate a published set of 66 computer-
assisted
musical composition functions from APL to J. I'm
pleasantly surprised
that my intense trying over the past several months to
understand array
programming and J in particular seems to be paying off.
Though by no
means being anywhere near very knowledgeable, I've been able to
look at
both J and APL code and, in most cases, to understand what was
going on
and, with APL code, to successfully begin translating to J
versions.
(I've even been able to note on occasion that J had a
better/shorter
way to do something than the APL code did.)
However, I ran into an APL construction that I cannot find in
the half
dozen APL books I have. Since many/most of you have APL
background, I
thought I ask here so that I could have some assistance in
translating
to J. Here's the line that's stumped me (I substituted J's
~: for the
APL not-equal symbol and <- for APL's assignment symbol):
Z <- R,[_0.5](0 ~: ATTK)/ATTK <- +/[0] Z
I understand everything except the [_0.5] code and what it means
in
context. It doesn't seem to fit anything in my books about
bracketed
indexing in APL, and none of the book indexes lead to any
information
about what this construction might mean, so that I can translate
it to
J. Thanks in advance for any help!
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--
------------------------------------------------------------------------
|\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram)
|/\| ramacd <at> nbnet.nb.ca |
|\ | | The only real problem with APL is that
BSc(Math) UNBF'83 | it is "still ahead of its time."
Sapere Aude | - Morten Kromberg
Natural Born APL'er |
-----------------------------------------------------(INTP)----{ gnat }-
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