Hacker News: Pompidou

New comment by Pompidou in "Zoo of array languages"

Pompidou — Tue, 14 Oct 2025 12:52:56 +0000

R is also an array language, but a non-iversonian one. Another good ressource for array languages is https://aplwiki.com/.

r/apljk on reddit is also active.

New comment by Pompidou in "Why did not numpy copy the J rank concept?"

Pompidou — Sat, 05 Jul 2025 13:33:07 +0000

Maybe the internal broadcasting mecanism in numpy don't allow this nativelly ?

New comment by Pompidou in "That XOR Trick (2020)"

Pompidou — Fri, 04 Jul 2025 01:12:44 +0000

the top comment trick [ n, 1, n + 1, 0 ][n % 4] can be implemented in J as following :

   f =: ]`1:`>:`0:@.(4&|)"0

Then:

   (,. ; #: ; [: #: f) i.16

 0    0 0 0 0    0 0 0 0    
 1    0 0 0 1    0 0 0 1    
 2    0 0 1 0    0 0 1 1    
 3    0 0 1 1    0 0 0 0    
 4    0 1 0 0    0 1 0 0    
 5    0 1 0 1    0 0 0 1    
 6    0 1 1 0    0 1 1 1    
 7    0 1 1 1    0 0 0 0    
 8    1 0 0 0    1 0 0 0    
 9    1 0 0 1    0 0 0 1

....

New comment by Pompidou in "I don't like NumPy"

Pompidou — Fri, 16 May 2025 13:02:45 +0000

Array programming requires true array languages like apl and j.

New comment by Pompidou in "Notation as a Tool of Thought (1979)"

Pompidou — Sat, 03 May 2025 15:51:11 +0000

It's free and allow use of standard ASCII characters

New comment by Pompidou in "Notation as a Tool of Thought (1979)"

Pompidou — Sat, 03 May 2025 15:50:51 +0000

J is free. k is closed Source,and cost a life.

New comment by Pompidou in "Notation as a Tool of Thought (1979)"

Pompidou — Fri, 25 Apr 2025 15:38:21 +0000

J has revolutionized the way I think. I can confirm it: ever since I learned to program with it, I’ve been able to solve so many problems that previously felt far beyond my (limited) intellectual reach. For me, J (and by extension, the APL family more broadly) has contributed as much to my thinking as the methodologies I learned during my university studies in philosophy. Suffice it to say, it has profoundly and positively shaken me.

New comment by Pompidou in "DOGE worker’s code supports NLRB whistleblower"

Pompidou — Thu, 24 Apr 2025 01:01:44 +0000

Maybe not everyone involved is quite the genius you might've been expecting.

New comment by Pompidou in "Ask HN: What less-popular systems programming language are you using?"

Pompidou — Tue, 04 Mar 2025 14:07:36 +0000

New comment by Pompidou in "What about K?"

Pompidou — Mon, 10 Feb 2025 19:48:27 +0000

Maybe codfns for apl will solve this ? That's what I understood.. but maybe I'm wrong.

New comment by Pompidou in "Some identities in J (array language)"

Pompidou — Thu, 06 Feb 2025 11:00:45 +0000

-: and :- are not the same... Maybe some typos... But your list shows how left and right terms are the same in each identities. Look like some pedagogical stuff.

For instance :

(],[) -: ([,])~

(],[) Appends right and left term while ([,])~ append left and right term after arguments order inversion.

New comment by Pompidou in "A history of APL in the USSR (1991)"

Pompidou — Tue, 04 Feb 2025 15:29:24 +0000

Wow it's very interresting. I published it on reddit.com/r/arraylanguages thanks a lot!

New comment by Pompidou in "Sound As Pure Form – a Forth for audio synthesis with APL-like auto-mapping"

Pompidou — Tue, 04 Feb 2025 15:28:22 +0000

Good. I put it on reddit.com/r/arraylanguages

New comment by Pompidou in "Has LLM killed traditional NLP?"

Pompidou — Sun, 19 Jan 2025 14:58:14 +0000

They all fall into the pitfall that Martin Heidegger suggested avoiding, particularly in the introduction of his text What Is a Thing?.

New comment by Pompidou in "Make a "Magic Eye" image using Excel"

Pompidou — Mon, 09 Dec 2024 15:28:13 +0000

You mean that all theses stuff on my screen are also physical beings? Lol. And while we are it, women and Real World exist ?

New comment by Pompidou in "KlongPy: High-Performance Array Programming in Python"

Pompidou — Mon, 02 Dec 2024 15:51:52 +0000

No. In APL deriverd array programming languages, verbs (or functions) are monadic or dyadic : they accept only one or two arguments :

In '1 + 1', + is a dyadic operator, while in 'exp 5', exp is monadic.

In J, and in APL I guess, left arg is usually understood as 'control data', while right arg is the data upon which calculation is done. Left argument is usually left unchanged after calculations.

In this way, is it possible to create multi-arguments verbs, by placing boxed args on the left of the verb.

New comment by Pompidou in "Steven Hawking's time traveller party"

Pompidou — Tue, 17 Sep 2024 20:47:27 +0000

Better : people have to Guess on day 1 a random value generated on day 2, and the winner would be awarded with a Big amont of money. Privacy granted. Lottery. Lottery IS a Time traveller detection device.

New comment by Pompidou in "The Mouse Programming Language on CP/M"

Pompidou — Tue, 03 Sep 2024 02:41:34 +0000

Both the 1979 and 1983, C and Pascal versions, compile fine and work as expected using last versions of respectively TCC and Lazarus on windows 10.

http://mouse.davidgsimpson.com/mouse83/mouse83_c.txt http://mouse.davidgsimpson.com/mouse83/mouse83_pas.txt

http://mouse.davidgsimpson.com/mouse79/mouse79_c.txt http://mouse.davidgsimpson.com/mouse79/mouse79_pas.txt

New comment by Pompidou in "Einstein's Other Theory of Everything"

Pompidou — Mon, 02 Sep 2024 03:02:38 +0000

"Gem test" 1 and 2 on john brandenburg 's youtube channel :

https://www.youtube.com/watch?v=hqbOnqZtz3Y

https://www.youtube.com/watch?v=RSRbLA6dhtk

New comment by Pompidou in "Bit-banging a BASIC Birthday"

Pompidou — Mon, 19 Aug 2024 17:01:46 +0000

A 50 years old man is indeed a classic piece of hardware.