Re: [Jchat] J for Image Processing

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.

Re: [Jchat] recognizing numbers

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

Re: [Jchat] recognizing numbers

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

Re: [Jchat] unicode characters for pointing N-E-W-S

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

Re: [Jchat] Google, NASA explain quantum computing and making mincemeat of big data — Tech News and Analysis

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: [Jchat] Google, NASA explain quantum computing and making mincemeat of big data — Tech News and Analysis

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

Re: [Jchat] Google, NASA explain quantum computing and making mincemeat of big data — Tech News and Analysis

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

Re: [Jchat] Google, NASA explain quantum computing and making mincemeat of big data — Tech News and Analysis

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

Re: [Jchat] Julia

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

Re: [Jchat] Julia

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

[Jchat] Fwd: Re: [Jprogramming] J Symbols

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

[Jchat] Fwd: Re: recognizing numbers

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

[Jchat] Fwd: Re: Parallel Processing for J

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

[Jchat] Fwd: Re: APL character support - skins

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

[Jchat] Fwd: Re: new wiki essay

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

[Jchat] Fwd: Re: J subset compilation

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

[Jchat] Fwd: Re: J subset compilation

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

[Jchat] Fwd: Re: Knuth quote

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

Re: [Jchat] Fwd: Re: J subset compilation

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 ---

Re: [Jchat] FUN!

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

Re: [Jchat] windows process priority?

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,

Re: [Jchat] J for the blind?

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

[Jchat] Fwd: Re: The Imitation Game

=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,

Re: [Jchat] quickest looping construct

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

Re: [Jchat] quickest looping construct

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

[Jchat] strong typing

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

Re: [Jchat] Four Solutions to a Trivial Problem

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

Re: [Jchat] Unum, new number format

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?) >

Re: [Jchat] Unum, new number format

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

Re: [Jchat] JWithATwist or Tacit J

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&#x

Re: [Jchat] html5

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

Re: [Jchat] typescript

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 --

Re: [Jchat] typescript

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

Re: [Jchat] typescript

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

Re: [Jchat] Unums 3.0

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

Re: [Jchat] Unums 3.0

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 ---

Re: [Jchat] Unums 3.0

----- 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

Re: [Jchat] Unums 3.0

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

[Jchat] Fwd: Lambda metts APL Summer School in Edinburgh

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

Re: [Jchat] How close is J to APL?

#? 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

Re: [Jchat] How close is J to APL?

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

Re: [Jchat] How close is J to APL?

-- 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

Re: [Jchat] How close is J to APL?

------ 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

Re: [Jchat] How close is J to APL?

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

Re: [Jchat] J and future coding practices

...). 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

Re: [Jchat] Introducing J to Financial & Actuarial Students

- 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 --

[Jchat] programming heavy metal

>>> >>> For information about J forums see http://www.jsoftware.com/forums.htm >> >> >> -- John D. Baker bakerj...@gmail.com >> -- >> >> For info

Re: [Jchat] programming heavy metal

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

[Jchat] John Conway

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..

[Jchat] Raspberry pi?

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

Re: [Jchat] Raspberry pi?

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

Re: [Jchat] ibm goes down

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

Re: [Jchat] Font ligatures and symbols for J digraphs?

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

Re: [Jchat] APL book.

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

[Jchat] Ian Sharp — 1932-2021

ware.com/papers/SharpQA.htm>* *(chat forum for comments please)* -- For information about J forums see http://www.jsoftware.com/forums.htm -- For information

Re: [Jchat] Should I learn APL or J?

.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://

Re: [Jchat] Advent of Code

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 ---

[Jchat] Optical computers

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 ---