Hi, Cliff,
I'm looking to turn your medianf function into APL, but
will have to relearn J in order to do so. Can you give me a
quick translation into APLish of that? If that's not trivial,
or if you're up to your butt in alligators, it's no big deal:
I'll dig out the J books and figure it out.
The pi*10^7 seconds stuff was a standard back-of-the-envelope
estimate at Caltech in 1964. [And likely much earlier...]
Bob
On 13-05-01 01:05 PM, Roger Hui wrote:
Très cool. https://xkcd.com/1047/ says that 75^4 is approximately the
number of seconds in a year.
y=: */ 365.2425 24 60 60
le or not!
On 13-05-01 02:30 PM, Roger Hui wrote:
Hey man, I didn't say it was original with me, just that it was cool!
Do you recognize this: 142857. (Hint: probably too low brow for a Cal
Techie.)
On Wed, May 1, 2013 at 10:59 AM, Robert Bernecky
wrote:
The pi*10^7 seconds stuff w
How about the APL arrows?
← → ↑ ↓
Bob
On 13-08-11 04:46 PM, Brian Schott wrote:
What fun. Shapecatcher is great. First off it clarified that I
misunderstood the Braille pattern from unicode.org because there are no
white circles. And it pointed me in directions I would not have imagined. I
was
ooking at the lapack lab today
and I see carefully written documentation on a routine named dgbrfs
but I can't find any hint of how I could make that routine run
(geev_jlapack_ works just fine, however - as near as I can tell,
anyways).
Thanks,
--
Robert Bernecky
Snake Island Research Inc
re is no road connecting those two,
then you set a fake distance of infinity for that element.
Bob
On 13-10-12 02:10 PM, Raul Miller wrote:
On Sat, Oct 12, 2013 at 2:06 PM, Robert Bernecky
wrote:
A harder problem is that of the "travelling salesman problem",
in which we want to compu
t;wasted", and
you'd need something considerably more general if you wanted to deal
with other problems.
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@s
with all of the possibilities and constraints.
If you can see a better way to represent this problem from a hardware
design perspective, I'd be interested in hearing about it.
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
to trim back some of the suggestions.
It seems to me that we could have a J subset targeted at just the
features needed to implement LAPACK and wired into gcc for code
generation.
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toron
her languages.
And I think both of those are well within reach.
Of course, this kind of thing will also tend to kick up a fair bit of
noise and odd problems, so we will need to tolerate some of that also.
Thanks,
--
Robert Bernecky
Snake Island Research
Sorry about the next few messages; they've somehow
been going to the wrong address for many moons...
Bob
Original Message
Subject:Re: [Jchat] [Jprogramming] J Symbols
Date: Fri, 12 Apr 2013 14:38:43 -0400
From: Robert Bernecky
To: chat@forums.jsoftwar
More old news...
Original Message
Subject:Re: [Jchat] recognizing numbers
Date: Wed, 01 May 2013 15:17:07 -0400
From: Robert Bernecky
To: chat@forums.jsoftware.com
There was another lovely physics question:
3. If you were given a very precise barometer and
more
Original Message
Subject:Re: [Jchat] Parallel Processing for J
Date: Fri, 28 Feb 2014 10:58:39 -0500
From: Robert Bernecky
To: chat@forums.jsoftware.com
CC: Sven-Bodo Scholz
SAC, which I mentioned yesterday, includes back end support for
CUDA
And more
Original Message
Subject:Re: [Jchat] APL character support - skins
Date: Thu, 27 Feb 2014 17:05:57 -0500
From: Robert Bernecky
To: chat@forums.jsoftware.com
I have been trying to peddle that same idea for about
twenty years now, without people
Original Message
Subject:Re: [Jchat] new wiki essay
Date: Sat, 22 Feb 2014 10:31:48 -0500
From: Robert Bernecky
To: chat@forums.jsoftware.com, Morten Kromberg
The folks at Dyalog have introduced "futures and isolates" into
release of 14.0 of
and more
Original Message
Subject:Re: [Jchat] J subset compilation
Date: Fri, 28 Feb 2014 15:08:03 -0500
From: Robert Bernecky
To: chat@forums.jsoftware.com
Again, rtl is far too low level to be a good basis for writing
array-based optimizations, IMO
Original Message
Subject:Re: [Jchat] J subset compilation
Date: Thu, 27 Feb 2014 23:34:39 -0500
From: Robert Bernecky
To: chat@forums.jsoftware.com
Having been down this road several times (and still looking for
the exit sign...), I think it makes sense to
Original Message
Subject:Re: [Jchat] Knuth quote
Date: Tue, 02 Jul 2013 16:39:21 -0400
From: Robert Bernecky
To: chat@forums.jsoftware.com, Roger Hui
I have the 2nd printing (1969) of the first edition. Also the
second edition.
The quote in question leads
t
of such things). There's other ways of making money, of course, but that's
a topic for another discussion.
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
---
om
to: Chat forum
date: 23 March 2014 10:06
subject: [Jchat] FUN!
http://pi.ytmnd.com
R.E. Boss
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth S
have noticed, recently, that when I manually set a J process to "above
normal" priority that something (I do not know what) sets it to "below
normal" after a time.
Needless to say, this is frustrating.
Has anybody heard of this kind of thing happening, elsewhere?
Thanks,
APL certainly did. Back in The Dark Ages, I was working in Heidelberg, and
one of their programmers, who was sightless, had a (then) very high-tech
camera, about the size of a bic lighter, which connected to a fingertip-sized
pad of pins.
Said pins would vibrate for dark (or light - you could dial
=S23yie-779k .
And speaking of code, I don’t know if you saw this recent BBC report of
the smallest chess game ever coded — a mere 487 bytes!
http://www.bbc.co.uk/news/technology-31028787
Peter
On 02-02-2015, at 8:56 AM, Robert Bernecky <mailto:berne...@snakeisland.com>> wrote:
Hi,
ints placed on the coding challenge
------
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
t
the infixes, however
I having found anything for nub (distinct), which makes some sense
since it can't be reduced to an atom like the math operations
Thanks for the ideas
On Tue, Feb 3, 2015 at 3:42 PM, Robert Bernecky
wrote:
"9 character infixes" - that looks like an input to
em do things such as multiplying Kilograms times Gram
(and getting the right answer) , while forbidding Meter * Gram.
I think these folks have some good ideas that could be exploited
in J and APL to everyone's benefit.
Bob
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's
that prefix and suffix scans and divide and conquer are also >50 years old.
> Not sure if he genuinely unaware or this is some kind showmanship
> --
> For information about J forums see http://www.jsoftware.com/forums.h
nd see how guass-jordan reduction (or
> whatever) works with them.
>
> The question is: are these just a gimmick, optimized for a certain set
> of algorithms, or do they have general utility? (Or, if you prefer,
> the question is: how much utility does this representation have?)
>
yalog.com/blog/2015/06/in-praise-of-magic-functions-part-two/>
>
>
>
> On Thu, Apr 28, 2016 at 9:44 AM, Robert Bernecky
> wrote:
>
>> One of the great advantages of SAC is that you can solve the
>> "...define words like..." problem with it, with NO loss
about. Writing a J front end for
the APEX compiler would not be a huge effort; the remainder of the compiler
would just work (modulo rational numbers and other J-only features, which
could be added on an as-needed basis).
Bob
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward
t;> stored.)
>>
>> So you can simplify that to:
>>
>> #!/bin/sh
>> /Applications/j64-805/bin/jconsole '~user/startserver.ijs' -js
>> 'startcommand 0'
>>
>> replacing the "start" stuff with whatever works for you (and maybe
microsoft.com/typescript/2016/12/07/
announcing-typescript-2-1/
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
3 seconds. (And I need to implement this so it runs
every hour - or, preferably, every five minutes - on an ongoing
basis.)
I expect there's a lot of static type skeletons buried here.
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
b
Well, I can give it a try, but I'll have to hand-convert it to
SAC...
Bob
On 2016-12-29 12:29 PM, Raul Miller wrote:
I'm not working in J, here.
I'm working in [redshift] SQL.
Still interested?
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
e.com
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 41
ing much larger
fields of values. And I'm not going to see anything like that in this
video.
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
---
-----
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
b
On 2017-02-12 06:26 PM, Raul Miller wrote:
Mmm... require it where, though?
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 41
Artem said APL, but I am sure he means to get this call out to the entire
functional array language community.
Please forward this email to any interested parties, and let Artem know
if you
would like to attend the summer school and/or make any presentations at it.
Thanks,
Bob
Forwar
#?
Would one view J as a superset of APL?
Are J and APL more than niche languages?
Sorry if any of these questions are perceived to be offensive, probably they
have been asked many times before.
Sorry also if these questions are deemed silly such as a toddler might ask.
Regards,
Jane the no
enda
est*.
On Thu, May 17, 2018 at 7:54 AM, Robert Bernecky
wrote:
...
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
ber
------
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
text/cell: +1 416 996 4286
ne-printers was adapted from a
"library" chain because it had Greek letters on it. If you ever looked
at
the chain after it had been in use for a while, you would see one shiny,
unused character on it: the lower-case lambda which was a remnant of the
original chain but was not used in
...).
Anyways, probably some things would wind up being faster and other
things could wind up being slower... But maybe the key value would be
lessons learned during the attempts.
Thanks,
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne
-
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
text/cell: +1 416 996 4286
--
>>> >>> For information about J forums see
http://www.jsoftware.com/forums.htm
>> >> >> -- John D. Baker bakerj...@gmail.com >>
--
>> >> For info
thumbing?
On Apr 6, 2020, at 4:04 PM, Devon McCormick wrote:
brown-thumbing the IPSCOBOL compiler,
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
fyi
https://mathoverflow.net/questions/357197/conways-lesser-known-results?utm_source=Iterable&utm_medium=email&utm_campaign=the_overflow_newsletter&utm_content=4-23-20
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne..
ut there's a Pi 400 PC
kit out there. Are the
earlier generations worth looking at?
Bearing in mind that I'm unlikely to persuade him to install J (though
he might appreciate
Mathematica which has been mentioned as part of the bundle) : any ideas,
recommendations, caveats
Thanks in ad
bhid=270924590690520001064770973226
Can Raspberry pi run Windows?
On Fri., Nov. 20, 2020, 08:56 Robert Bernecky,
wrote:
Hi, Mike,
I have several Pi machines kicking around my lab, for
various projects. They are simple and super, IMO.
The Pi 4 B is quite good, I find: 4 cores, two 4K HDMI outputs,
WIFi, and more
For information about J forums see http://www.jsoftware.com/forums.htm
--
For information about J forums see http://www.jsoftware.com/forums.htm
------
For informati
ible idea" for programming, but
I still wonder! :-)
https://practicaltypography.com/ligatures-in-programming-fonts-hell-no.html
Thoughts?
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Ber
see http://www.jsoftware.com/forums.htm
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisla
ware.com/papers/SharpQA.htm>*
*(chat forum for comments please)*
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
For information
.com/forums.htm
--
Devon McCormick, CFA
Quantitative Consultant
--
For information about J forums see http://www.jsoftware.com/forums.htm
--
For information about J forums see http://
t J forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
text/cell: +1 416 996 4286
---
forums see http://www.jsoftware.com/forums.htm
--
Robert Bernecky
Snake Island Research Inc
18 Fifth Street
Ward's Island
Toronto, Ontario M5J 2B9
berne...@snakeisland.com
tel: +1 416 203 0854
text/cell: +1 416 996 4286
---
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