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Date: 14 Jul 95 23:13:00 EDT

Subject: apl-l UseNet batch for Fri Jul 14 23:59:03 ADT 1995 [No Gate]


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Subject:      apl-l UseNet batch for Fri Jul 14 23:59:03 ADT 1995 [No Gate]

Contents of apl-l UseNet batch for Fri Jul 14 23:59:03 ADT 1995 [No Gate]:

  1. Subject: APL language interpreter (MANUGISTICS APL*PLUS II/unix Interpreter release 5 or later)?

  2. Subject: Re: APL+II for 386 ver 5.2

  3. Subject: Re: Revision history for J

  4. Subject: Re: APL language interpreter (MANUGISTICS APL*PLUS II/unix Interpreter release 5 or later)?

  5. Subject: Revision history for J


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Newsgroups: comp.lang.apl
Subject: APL language interpreter (MANUGISTICS APL*PLUS II/unix Interpreter release 5 or later)?
Date: 13 Jul 1995 00:39:13 GMT
Organization: KAERI
Lines: 9

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Does anyone know about this ?
please let me know what this is, how/where I can purchase it.
Any information will be appreciate.

I have a HP715-80 W/S, which will be used to install and run APL.

Thanks in advance.


===> Start of article 2

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Newsgroups: comp.lang.apl
Subject: Re: APL+II for 386 ver 5.2
Date: 13 Jul 1995 03:46:18 GMT
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It runs under all versions of MS Windows NT for Intel machines.
There is a limitation however. You must use the special DOS
keyboard mode by specifying e=2 on the startup line.

The Manugistics APL*PLUS helpline can give you more information
on this.

Regards...Joe

===> Start of article 3

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Newsgroups: comp.lang.apl
Subject: Re: Revision history for J
Date: 13 Jul 1995 00:26:03 GMT
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: Can anyone provide with or direct me to a history of revisions to J. I
: understand that the current release is 2.04 and that the freeware version
: is 2.01. I'd like to know what the "delta" is.
:

The current commercial release (at least for Mac and Windows) is 2.06;
I got both about a week ago.

--

  Mathematics & Statistics Dept.            Voice:  413-545-2859 (W)
  University of Massachusetts                       413-549-1020 (H)
  Amherst, MA 01003                           Fax:  413-545-180

===> Start of article 4

Path: news.unb.ca!torn!howland.reston.ans.net!news.sprintlink.net!news.cais.com!cais2.cais.com!elandau

Newsgroups: comp.lang.apl
Subject: Re: APL language interpreter (MANUGISTICS APL*PLUS II/unix Interpreter release 5 or later)?
Date: 13 Jul 1995 12:55:18 GMT
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: Does anyone know about this ?
: please let me know what this is, how/where I can purchase it.
: Any information will be appreciate.

You can call Manugistics directly:  800-592-0050.

--

"Sacred cows make the tastiest hamburger." -- Abbie Hoffman

===> Start of article 5

Newsgroups: comp.lang.apl
Path: news.unb.ca!torn!watserv2.uwaterloo.ca!watserv1!news

Subject: Revision history for J



Nntp-Posting-Host: watserv1.uwaterloo.ca
Organization: University of Waterloo
Date: Fri, 14 Jul 1995 13:07:19 GMT
Lines: 202

Ohm377 writes:

>Can anyone provide with or direct me to a history of revisions to J. I
>understand that the current release is 2.04 and that the freeware version
>is 2.01. I'd like to know what the "delta" is.

The current release is 2.06. The FreeWare version is based on J2.03.

What do you mean by "delta"?

Attached is the J2.06 status

Chris

==============================================

Copyright (c) 1990-1995, Iverson Software Inc.  All rights reserved.

J Implementation Status (Release 2.06 -- 1995 5 30)

System Limits:

  Array rank             <: 127
  Comparison tolerance   <: 2^_34
  Object size            <  65536 bytes  [PC AT only]
  Workspace size         <  640 Kbytes   [PC AT only]

Not Yet Available:

  _                  incomplete
  __                 incomplete
  _.                 incomplete
  c.
  E.                 incomplete

Changes in Release 2.01, 1994 9 1
  <!.k               removed monad
  >!.k               removed monad
  u^:n               faster for scalar n
  $.                 removed
  u~                 faster
  |.                 changed left rank to 1
  :                  changed numeric encoding
  control words      implemented
  u;.3               implemented
  u;._3              implemented
  0!:xyz             implemented
  0!:2               implemented
  1!:0               implemented
  1!:5               implemented
  1!:6               implemented
  1!:7               implemented
  1!:20              implemented
  1!:21              implemented
  1!:22              implemented
  1!:30              implemented
  1!:31              implemented
  1!:32              implemented
  1!:55              changed to also work on directories
  2!:0               moved from 0!:0
  2!:1               moved from 0!:1
  2!:55              moved from 0!:55
  3!:2               changed to be inverse of 3!:1 and 3!:3
  3!:3               implemented
  4!:3               implemented
  4!:4               implemented
  4!:56              removed
  5!:3               removed
  5!:4               changed to use linear rep. for nouns

...

read more »



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Subject:      apl-l UseNet batch for Sat Jul 15 23:59:04 ADT 1995 [No Gate]

Contents of apl-l UseNet batch for Sat Jul 15 23:59:04 ADT 1995 [No Gate]:

  1. Subject: Various


  placing a single line in the body of the message saying

  SIGNOFF apl-l

===> Start of article 1

Newsgroups: comp.lang.apl
Path: news.unb.ca!torn!watserv2.uwaterloo.ca!watserv1!news

Subject: Various



Nntp-Posting-Host: watserv1.uwaterloo.ca
Organization: University of Waterloo
Date: Fri, 14 Jul 1995 16:23:39 GMT
Lines: 39

I apologize if the following turn out to be repeat appends, I
appended each separately several days ago by another means
and none seem to have showed up:
-----
Subject: Reading CD-ROM files

John R. Clark:

APL232 (of APL2/PC) will run in a DOS <fullscreen> session
under OS/2.  Getting the APL2 characters set does require
some additional modification to config.sys, this is documented
in the APL2/PC User's Guide (1.02) on page 552.

If you need further assistance on this please contact us

Nancy Wheeler
APL Products and Services, IBM
-----
Subject: Low cost APL2 for the PC

TryAPL2 from IBM is free.
You can ftp it from ftp.software.ibm.com/ps/products/apl2/demos/tryapl2

Nancy Wheeler
APL Products and Services, IBM
-----
Subject: APL2/PC HP Fonts ??

John K. Taber,
Version 1.02 of APL2/PC includes fonts for LaserJet printers.
See appendix F for more information.

If you don't have Version 1.02, please contact us at

Nancy Wheeler
APL Products and Services, IBM

===> End of articles for Sat Jul 15 23:59:04 ADT 1995

--XAA22875.805865284/aqua.whoi.edu--



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Subject:      apl-l UseNet batch for Sun Jul 16 23:59:03 ADT 1995 [No Gate]

Contents of apl-l UseNet batch for Sun Jul 16 23:59:03 ADT 1995 [No Gate]:

  1. Subject: Simple "checksum" question?

  2. Subject: Re: Hilbert matrix

  3. Subject: Re: Simple "checksum" question?


  placing a single line in the body of the message saying

  SIGNOFF apl-l

===> Start of article 1

Path: news.unb.ca!torn!howland.reston.ans.net!swrinde!emory!darwin.sura.net!bcfreenet.seflin.lib.fl.us!bcfreenet!z007484b

Newsgroups: comp.lang.apl
Subject: Simple "checksum" question?
Date: 15 Jul 1995 18:02:14 GMT
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Lines: 30

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I'm way over my head in this group, but I'm sure some of you erudite
hackers can help me with this question.  I have no formal training with
computers, yet I seem to be at the head of my class in my company.  I've
managed to do some simple programing in basic and dbase by reading the
books and trial & error.  Lately, I have been asked if I could come up
with some way to check for transcription errors in our databases, and it
has been suggested that using "checksums" would be the way to go.  I have
searched my meager references and have drawn a blank.  Can someone give a
simple explanation of how checksum works and maybe point me to some
reference materials?

Many thanks!

--
Gary Meyer
"the neritic flyfisherman"


===> Start of article 2

Newsgroups: comp.lang.apl


Subject: Re: Hilbert matrix



Nntp-Posting-Host: watserv1.uwaterloo.ca
Organization: .
Date: Sat, 15 Jul 1995 21:07:40 GMT
X-Mailer: ELM [version 2.3 PL11]
Lines: 38


Jim Weigang writes on Monday, July 10:

> I was thinking of something similar to the F:{alpha}/{omega} form of
> direct definition.  But to allow direct use of an unnamed function, it
> would be helpful if you could write something like "{x.+y.}".  With this
> convention, ordinary assignment would replace "F:".  And the notation
> would extend in a natural way to multiline definitions:  If a line was
> missing a closing brace, the definition would continue until the brace
> was encountered.

Very good.  This is similar to functions/operators derived from the :
conjunction in J (a.k.a. explicit definition).  This proposal
differs from : is that : uses a quoted or boxed argument, and in so
doing does not require infinite lookahead on a sentence being parsed.
Currently the J parser only needs to look ahead four words.

{x. f y.} has drawbacks similar to : , already stated previously in
this sequence of msgs, in that fns derived therefrom can be rather
difficult to analyze.  For example, it's not so easy to recognize
the duality in {1+$:_1+y.} that you used in place of my $:&.<: ,
or to compute the derivative of {1 o. 2 o. y.} or {1 o. {2 o. y.} y.}

> ...
> The hook, fork, conjunctions, and cap ([:), seven syntactic elements in
> all, serve to make up for the inability to insert one reference to the
> argument y. in the middle of the expression.

Well, it depends on what you are used to.  This is akin to saying
the APL expression (p{times}0=b)+(q{times}1=b} is to make up for the
lack of control structures, such as "if b then p else q".

Regarding the style of exposition in c.l.a. postings:  depending
on one's proclivities, one might find annoying, if not quite appalling,
the verbose style that you seem to favor.  The feeling I often get is,
"why doesn't he get to the point?"

===> Start of article 3

Newsgroups: comp.lang.apl


Subject: Re: Simple "checksum" question?



Nntp-Posting-Host: watserv1.uwaterloo.ca
Organization: .
Date: Sun, 16 Jul 1995 16:00:48 GMT
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Gary Meyer writes on Saturday, July 15:

> ...                       Lately, I have been asked if I could come up
> with some way to check for transcription errors in our databases, and it
> has been suggested that using "checksums" would be the way to go.  I have
> searched my meager references and have drawn a blank.  Can someone give a
> simple explanation of how checksum works and maybe point me to some
> reference materials?

You may have better luck looking for the topics "parity check"
or "CRC (cyclic redundancy check)".  See E.R. Berlekamp, Algebraic
Coding Theory, McGraw-Hill, 1968, or Zvi Kohavi, Switching and
Finite Automata Theory, McGraw-Hill, 1970.

In each case, the stored data is augmented with check bits
which are a function of the data bits.  On storage, check bits
are computed from the data bits, and both the data bits and the
check bits are stored; on retrieval, new check bits are computed
from the retrieved data bits, and an error is signalled if the new
check bits differ from the retrieved check bits.

Parity checking works by considering the data as blocks of bits,
and the inclusion of another bit for each block that makes the sum
of the bits either even or odd (even or odd parity).  For example:

   b=. ?5 8$2        NB. 5 random 8-bit bytes
   b
1 1 1 1 0 1 1 0
0 1 0 0 0 0 0 0
1 1 0 1 1 1 0 1
0 0 0 1 0 1 0 0
1 1 0 1 0 1 1 1
   ~:/"1 b           NB. insert not-equal between elements of a row
0 1 0 0 0
   c=. b ,. ~:/"1 b  NB. augment each row with a parity bit
   c
1 1 1 1 0 1 1 0 0
0 1 0 0 0 0 0 0 1
1 1 0 1 1 1 0 1 0
0 0 0 1 0 1 0 0 0
1 1 0 1 0 1 1 1 0

The last result is what one would store as the data.  On retrieving
the data, the computation ~:/"1 c should yield all 0's.  (Even parity
is used in this case.)

   ~:/"1 c           NB. must be all 0s for even parity
0 0 0 0 0

This technique would detect all single bit errors in each word,
including an error in the parity bit, but it would not detect
transpositional errors (two unlike bits transposed, a 2-bit error).

Another common technique is longitudinal parity checking, whereby
not-equal is inserted between the rows of a group of bytes, and the
resulting boolean vector is appended to the bottom of the group.  Thus:

   ~:/ c             NB. insert not-equal between rows
1 0 1 0 1 0 0 0 1

...

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