hellow my fellow apples

(○.○)

CMC apl-art: Draw an apple using APL characters.

Huh, bot?

tio.run/##SyzI0U2pTMzJT///…

so I have this

I want to apply the (⊢⍪¯1↓1↓⌽) function repeatedly on its own result

actually, remove the ⊢⍪

I just need the result of (¯1↓1↓⌽) applied ⍵ times on itself

⍣?

@Razetime Sounds like a job for ⍣

hmm ok

tio.run/##SyzI0U2pTMzJT///… lol

wacky pattern

I tried fixing it, but no output here: tio.run/##SyzI0U2pTMzJT///v1rj0HrDR22TQfhRz17NR72LH/…

tio.run/##SyzI0U2pTMzJT///v1pD49B6w0dtk0H4Uc9ezUe9ix/…

ok so how do I get intermediate results from ⍣?

I think you can just stick a ⎕← in there {((⎕←¯1↓1↓⌽)⍣⍵-3)↑{'#'↑⍨-⍵}¨⍳⍵}. Of course that doesn't "save" your intermediate results

If I come up with a handle that uses APL characters, is that my APLation?

@Razetime Not easily

oh my gawd

@RikedyP that prints the train

@Razetime Explicitly recurse with a dfn in that case, IMO

@Razetime yeah sorry didn't look very closely

maybe recursion will work

If getting the intermediate results isn't too expensive, can you do something like {f⍣⍵}¨⍳5?

@Razetime If you're golfing, then maybe switch to dzaima/APL, as it has ⍡ which is like ⍣ but with intermediaries.

There's a golfing tip for that

So, weird question... I accidentally left Match Whole Word on when doing a RegEx workspace search (something along the lines of .*SRF). I was hoping to get results ending "SRF". The workspace just hangs in 16.0/17.0/17.1, but seems functional in 18.0 pre-release. What changed, was it just seriously optimized? And what is the expected behavior of combining these two? (I imagine a single word ending SRF?)

@JamesHeslip with a non-functional vs fast i'd expect what changed is the algorithm (i.e. O(n^whatever) → O(n) or similar) and that's not that rare with regex impls

@JamesHeslip We fall back to non-regex when regex isn't actually needed, so 18.0 may do that in more cases than 17.1, especially since that code may have been looked at when ⍠'Regex' was added in 18.0.

Ah! I might have found the/an interaction which is breaking the alternate keyboard IME after sleep/resume cycles. I closed Remote Desktop, and Alt Gr + letter started working again. RDP client is always open long-term so that could be it.

I have an 18Mb CSV file

shouldn't I be able to read it into APL with ⎕CSV? It gives me a WS FULL

@RGS What is MAXWS?

      ⎕WA
266757632

Don't know how to check the maxws var

@RGS ]config maxws

256MB as per the options

and your command confirms it

tbf, each cell becomes a 64-bit pointer plus header etc.

You can ask ⎕CSV to fetch data piecemeal.

@Adám that's unreasonable for my purposes

I just want to read in a really large matrix :P

What would your suggestion be?

with the 256MB the ⎕nget quad function can read my larger CSV @ 107MB

And all the numbers in the CSV are below 2*8

@RGS Is the CSV all-numeric?

(I've got to pick up a child from school ― will be back in about 30 mins.)

@Adám has a non-numeric (irrelevant) header

is that confusing ⎕CSV?

the file has 785 columns and I tried using c ← ⎕csv 'filename' 'UTF-8' (785⍴2) to force ⎕csv into reading numbers instead of characters but I still get a WS FULL error. I'm working with the larger file now, 107MB

the smaller already works with the above without having to increase WS size

@RGS Use 1 for the header row indicator (4th element of the argument).

@Adám (already removed the header)

@RGS OK, and now, does it work?

@Adám it works in that it reads the smaller csv

it gives a WS FULL for the larger csv

even with a clean ws

How many rows?

and tbh that bothers me a bit bc the csv is 107MB and the ws size 256MB

60k rows

the final array should be 60000 785 in shape

with integers in the range 0 255 inclusive

That should only be 94 MB.

Indeed:

      m←?60000 785⍴255 ⋄ ⎕SIZE 'm'
94200040

@RGS I suggest you send an email to richard with the file attached and explain briefly what you are experiencing. You can CC me.

@Adám what richard? the non-park?

Yes, "richard" (Smith), hence my lowercase.

hm ok

btw reading the contents of the file with ⎕nget gives

      c ← ⊃⎕nget 'filename.csv' 1 ⋄ ⎕SIZE 'c'
112125744

but this I can :/ I am holding the whole file as a matrix in memory

You should even be able to do ⍎¨⊃⎕NGET 'filename.csv' 1 then.

@Adám I am, it just takes an awful lot of time and the interpreter freezes for some time

@RGS Maybe (2⊃⎕VFI)¨ is faster.

what is a domain error in matrix multiplication?

I am asking because my matrices have matching shapes and they hold numbers

so I am left wondering what a "domain error" could possibly mean...

@RGS What is ⎕DR of the two matrices?

1287

I think the numbers are exploding; that could be the issue, no?

exploding = getting TOO big

Right.

@RGS Coming?

yup, fetching my earphones

book talk?

Well, internship in general.

oh, never knew that was there.

@Razetime RGS is interning at Dyalog, and I'm his supervisor, so we meet once a week to check in.

Trying to make a basic filter function, never made an operator before, how come {(⍵⍵ ⍵)/⍵} doesn't work?

Got it, my bad

Oh never mind, how come you can't just have ⍵⍵ and ⍵?

@rak1507 that's just the rules - a monadic operator will always take the operand on the left, and a dyadic one requires both (and which of the two it is is decided by the presence of ⍵⍵). (similar to how you can't do 6{⍺} for a "monadic" function)

right ok