I just found out that FreeBSD has a reshape (rs) command (and, by extension, MacOS?). The pipeline looks almost like APL :) :

$ jot 20 1  | rs 3 5
1   2   3   4   5
6   7   8   9   10
11  12  13  14  15

What is jot then?

@Adám Jot primarily generates sequences of numbers, each number being on it's own line.

$ jot 5
1
2
3
4
5

The 1 in my first example is superfluous, a copy-paste laziness from my side.

A couple of examples:

$ jot - 0 100 25
0
25
50
75
100

$ jot -w "letter %c" 10 a
letter a
letter b
letter c
letter d
letter e
letter f
letter g
letter h
letter i
letter j

Basically a fancy ⍳

@Adám Yes, that's right. The man page says: "The name jot derives in part from iota, a function in APL." It's been in BSD since around 1983, from what I can tell.

@BojanPetrović Nice find. Should be added to aplwiki.com/wiki/Index_Generator#Outside_of_APL

@Adám Thanks, I should wright something up on the wiki.

*write

That's awesome.

Can confirm it works on a (brand new) mac:

stefan@Stefans-MacBook-Pro-2 ~ % jot 20 1  | rs 3 5
1   2   3   4   5
6   7   8   9   10
11  12  13  14  15

One might think this conflates ∘ and ⍳, but jot is an archaic name for the Hebrew letter that corresponds to the Greek letter iota.

It only does rank 2:

stefan@Stefans-MacBook-Pro-2 ~ % jot 8 1  | rs 2 2 2
rs: too many arguments

@Adám In Swedish: jota

"an iota" or "to jot down" comes from both iota and and the Hebrew letter yod being the smallest letters.

Does it look like this: י?

Hard to see.

My Hebrew is somewhat lacking.

Yes.

Hey all!

Does the bot here also run BQN?

no

Does anyone have a suggestion for giving someone a browser window in which to run APL? I was looking at this line of code from the Reddit r/apljk group

((N÷⍳N)=(⌊N÷⍳N))/⍳N←⎕

tryapl.org; you'll have to replace ⎕ with the input you want to give though (e.g. ((N÷⍳N)=(⌊N÷⍳N))/⍳N←10), as TryAPL doesn't support taking user input from ⎕

Yes, I guessed that might be what was meant by "NOT PERMITTED: Illegal token".

I could run it in a limited fashion in plj541.github.io/APL.js - it accepts the quad and asks for input but the expression as a whole fails unless I first assign "N" and run it without the quad.

Playing around with it, I see that the quad input seems to give a literal value as if it were quote-quad input.

@DevonMcC that appears to be based on ngn/apl, and an old version at that; latest (from 2018, ngn's stopped developing it) has ⎕ evaluating the input, but that appears to require an explicit ⎕← if there's any input-taking ⎕; note that APL implementations are quite different from one another

@DevonMcC Try it online!