The Nineteenth Byte

PyGamer0

05:00

CQ: Do you drink H²O or H₂O?

i drink the latter

exedraj

I prefer dihydrogen monoxide

Jo King

@exedraj my first answer on this site was in Befunge-93

oh wait, golf not esolang

probably MathGolf

exedraj

@PyGamer0 some say dihydrogen monoxide is poisonous, and that 100% of people who consume it die, but that's a risk I'm willing to take

Because I live on the edge

PyGamer0

@exedraj thats just h2o

exedraj

wow way to ruin the joke

PyGamer0

05:02

dihydrogen (2h) monooxide (o)

exedraj

22 secs ago, by exedraj

wow way to ruin the joke

PyGamer0

@PyGamer0 <- a number

why can you do that ^?

exedraj

@exedraj because replying to yourself is cool

Bubbler

Any feedback?

PyGamer0

exedraj

05:08

I guessed the number wrong

Razetime

05:41

@Razetime lol

:1 hi

wonder what the first message in here was

PyGamer0

Jan 28 '11 at 4:35, by Feeds

Hello, world!
Welcome to chat for: Code Golf.

or

Jan 28 '11 at 4:38, by Chris Jester-Young

tap tap tap Anybody here?

Razetime

@Feeds hello there

exedraj

TIL that mathematicians weren't satisfied with normal cartesian forms of 2d lines, so they went and studied 3d lines and vector equations

emanresu A

!H

Jo King

:58978493 Anyone tried to reply to the future yet?

emanresu A

05:52

Final feedback?

exedraj

@JoKing that's a long way in the future

the current message id is only around 58978410

Jo King

only 80 more messages to go

exedraj

which is the id of the message I sent

emanresu A

I wonder what will hapen

The message'd have to be here for it to work

exedraj

@exedraj lol

PyGamer0

05:54

@exedraj hi future if it works

exedraj

inb4 no

emanresu A

Hi

exedraj

@PyGamer0 yeah did didn't update

okay now it did

emanresu A

@emanresuA mHello from the past

PyGamer0

@exedraj it worked?!

exedraj

05:54

inb4 no was the message

I have a userscript which shows message ids

emanresu A

@emanresuA nmsg

PyGamer0

@emanresuA udate your previous one

@exedraj hi again

exedraj

@exedraj you need text for it to expand the ping

PyGamer0

wait i put a random id lol

exedraj

@exedraj like this

PyGamer0

05:56

@user so

wait what

exedraj

inb4 caird or redwolf (or bubbler or adam) move all this to trash or something

emanresu A

:58978480 It works, you can ping the future!

PyGamer0

:lol

@emanresuA but you have to update the thing

exedraj

alright I'm now taking bets on who'll move this to trash

reply with who you think'll move these messages

Bubbler

I'm not the one who trashes stuff :P

emanresu A

05:59

@exedraj Doorknob, from the past.

Where's hyper been all day?

Bubbler

@emanresuA You failed

exedraj

oh hey 58978480 is in another room

idk where

but not here

Jo King

what about my message?

exedraj

probably not here

emanresu A

It has not come

exedraj

06:01

okay it has now

emanresu A

^^ was it

exedraj

@emanresuA this

PyGamer0

wat

exedraj

see how I have the ids showing

Jo King

my original message doesn't appear to have updated though

PyGamer0

06:02

@exedraj yeaaaahaaaaa

emanresu A

@JoKing Try editing it

exedraj

@JoKing we tested that out about 50 messages ago

80 probably

PyGamer0

Try it online!

^ is that apl's rotate and rotate first?

emanresu A

16 mins ago, by emanresu A

Final feedback?

Adám

@PyGamer0 Only on matrices, afaict. Would fail on 1D and 3D arrays.

PyGamer0

06:15

@Adám how would i make it then?

@Adám seems to works with 1D matrix Try it online!

@Adám and 3d Try it online!

CQ: How does numpy's pretty printing of its arrays work?

Bubbler

06:39

@PyGamer0 1D is a vector, not a matrix. Also you just implemented reverse, not rotate, and the one without _first is reversing the second axis, not last

@PyGamer0 Lazy answer: read the numpy source code :P

I think it is printing each nesting level as an array [item1,<nl><pad>item2,<nl><pad>item3...,<nl><pad>lastitem] with pad = ' ' * nesting_level

Adám

06:56

@PyGamer0 Dunno. I don't Python, and implementing APL is not trivial. Have you looked at how others have done it?

PyGamer0

07:26

@Bubbler so This?

oh yes its reversed

so ¯1 ⌽ and ¯1 ⊖

Adám

@PyGamer0 Those are single-step rotations. Reverses are ⌽ and ⊖

PyGamer0

@Adám yes i implemented the single step rotations

Adám

When Gmail gets confused about time zones and all that:

9

PyGamer0

@Adám wow future people have contacted you

exedraj

@Adám tomorrow, 0 minutes ago

That sounds about right

PyGamer0

07:38

@Dudecoinheringaahing Try it online!

doesnt work like jelly with your method

PyGamer0

08:22

so is it modulus % or is it modulo?

cause i saw in a math book that modulus is another name for abs(

PyGamer0

08:35

how do i make matrix multiplication?

Razetime

many algorithms exist onlin

e

8

Adám

@PyGamer0 It is quite involved.

PyGamer0

def matmul(xa, ya):
    return reduce(lambda x, y: vectorise2(lambda a, b: a + b, x, y), vectorise2(lambda r, t: r * t, xa, ya))

^ doesnt work

@Adám wdym?

emanresu A

Any final feedback?

pxeger

@PyGamer0 en.wikipedia.org/wiki/Matrix_multiplication_algorithm?

PyGamer0

08:41

def matmul(A, B):
    return [[sum(a * b for a, b in zip(A_row, B_col))
                        for B_col in zip(*B)]
                        for A_row in A]

^ found that on geeks for geeks

Adám

@PyGamer0 You want to to work for arrays of all ranks, not just 2?

PyGamer0

@Adám nah 2 is fine

it will be a limitation for 51AC8

emanresu A

That's ÞTẊƛ÷*∑ in Vyxal

PyGamer0

@emanresuA i am not making 51AC8 in vyxal

not helpful

emanresu A

Or transpiled:

global stack, register, printed, output, MAP_START, MAP_OFFSET, _join, _vertical_join, use_encoding, input_level, raw_strings, retain_items, reverse_args, this_function
stack.append(transpose(pop(stack)))
rhs, lhs = pop(stack, 2); stack.append(cartesian_product(lhs, rhs))
def _lambda_ON2GCY3LFZQXA4DFNZSCQ5DSMFXHG4DPONSSQ4DPOAUHG5DBMNVSSKJJBJZGQ4ZMEBWGQ4ZAHUQHA33QFBZXIYLDNMWCAMRJHMQHG5DBMNVS4YLQOBSW4ZBIMNQXE5DFONUWC3S7OBZG6ZDVMN2CQ3DIOMWCA4TIOMUSSCQ_(parameter_stack, arity=-1, self=None):
    global context_level, context_values, input_level, input_values, retain_items, printed, register

Adám

08:44

@PyGamer0 OK, then it isn't so bad. Looks like you have some algorithms.

emanresu A

That helpful?

pxeger

@PyGamer0 in that case, you could just do the manual product

PyGamer0

CMC: Multiply two numbers/lists jelly style vectorisation

Future 51AC8: ×

emanresu A

Jelly, 1 byte: *

Adám

@PyGamer0 Works in APL too.

@emanresuA Works in J and K too.

@emanresuA Wait, isn't it × in Jelly?

emanresu A

08:47

@Adám Shows how much I know about Jelly

Although its weird

Adám

Why is it weird?

PyGamer0

@Adám ×_×

emanresu A

Literally every other language uses / and *.

/ isn't always so common

but *

PyGamer0

m-modulus or modulo??

Jo King

apart from you know, Jelly's parent language

Adám

08:48

@emanresuA Only because they can't use the proper English symbols.

@JoKing grandparent.

PyGamer0

> In computing, the modulo operation returns the remainder or signed remainder of a division

emanresu A

@Adám And that's the way it's been for thousands of years.

Jo King

@Adám right. i was going to say "parent languages", but that didn't sound right either

emanresu A

Since this has four upvotes and no problems so far, I'ma post it.

Adám

modulus/modulo is a bad term, as it can mean all kinds of things. Much better use use the terms residue and magnitude.

@emanresuA Is it a graphical output challenge?

emanresu A

08:50

No

PyGamer0

@Adám modulus is abs right?

modulo is the remainder operation

Adám

Usage varies.

emanresu A

As you can see in the comments, a rendering version where you're given a shapecode and have to render it would be interesting, once I figure out the specs.

John Dvorak

@Adám wait, does it?

Adám

PyGamer0

08:52

i am talking about the latter

John Dvorak

(other than most languages using % to represent remainder and calling it modulus)

Adám

John Dvorak

... I'd gladly kill off the latter and keep the former

PyGamer0

also now i have to implement the pretty print functions (hard) for this

Adám

Modulo (mathematics)

In mathematics, the term modulo ("with respect to a modulus of", the Latin ablative of modulus which itself means "a small measure") is often used to assert that two distinct mathematical objects can be regarded as equivalent—if their difference is accounted for by an additional factor. It was initially introduced into mathematics in the context of modular arithmetic by Carl Friedrich Gauss in 1801. Since then, the term has gained many meanings—some exact and some imprecise (such as equating "modulo" with "except for"). For the most part, the term often occurs in statements of the form: A is the...

The terms should be burninated for being too ambiguous.

PyGamer0

08:54

english is confusing; sometimes

Razetime

replace all math words with APL symbols challenge

Adám

Luckily, APLs use the same symbol for remainder and residue, so there's no confusion.

New Posts

0

Q: Make me a shape

The game shapez.io has a huge variety of shapes you can produce, such as: Each shape has a unique short code, for example the above is CrWbScRu. This means, going clockwise from top right, red circle (Cr), blue wedge (Wb), cyan star (Sc), uncolored rectangle (Ru). There are four different shapes...

Adám

And you find this glyph on the M key, as in M for modulo/modulus.

emanresu A

^ Have fun!

PyGamer0

08:58

CMC: A simple 2d language simulation. ><v^ for bouncing the ball around and @ to spawn a ball. ; Finish the program. As soon as the program finishes, print how much number of steps the ball took to end the program.

oh yes the default spawn direction of the ball is right

Adám

@PyGamer0 Looks like a main challenge to me, but you need examples in any case.

PyGamer0

@    ; # Outputs 4
--------------------
@   v # Outputs 4
    ;

pxeger

BMG is in 3 hours; get drafting!

BMG Drafts

Draft voting for Biweekly Mini Golf

Neil

@Dudecoinheringaahing I eat my crunchy peanut butter on sunflower seed rye bread. I can't see you being able to drag that type of bread up with the peanut butter...

@exedraj probably Charcoal

pxeger

Are any mods and/or Browncat Programs available to clear the starboard in ^ BMG drafts?

Sandbox Posts

09:09

0

A: Sandbox for Proposed Challenges

Fletcher's 16 bit checksum code-golf Intro No story this time :( This is something that I needed for a program and I thought that it would make for a fun little challenge. I'd love to see some unusual languages here! Challenge Implement Fletcher16. The algorithm is very straight forward, as seen ...

Sandbox Posts

09:43

0

A: Sandbox for Proposed Challenges

source-layout code-golf Hello, Toroidal Earth! Your task is to create a program that outputs the string: Hello, Toroidal Earth! with an optional trailing newline. Additionally if I remove the first line1 of your program and add it as a line after the end of your program the new program should be...

Wheat Wizard

@PyGamer0 What happens if the ball foes off the grid? What about infinite loops?

Jo King

@pxeger done

pxeger

thanks!

PyGamer0

@WheatWizard ball is like a laser if it fall of the grid it is reflected

pxeger

@Dudecoinheringaahing FTFY: Middle-aged women who insist that people who work for minimum wage aren't people, and therefore don't deserve respect, aren't people and therefore don't deserve respect

PyGamer0

09:57

@WheatWizard infinte loop is err infinite loop

pxeger

@Adám time to make an APL with those symbols swapped :Þ

Adám

:-|

emanresu A

Ok, who downvoted my shapes question? I'm not holding it against you, I just want to know why.

And I know it was someone here because both the sandbox version and the main version got downvoted, and I didn't even link to the sandbox version.

pxeger

Not me, but I imagine it was someone who thought it doesn't add much to the so many existing "generate a random thing under these hard-to-golf constraints" challenges

(Because that's what I think, even though I'm not gonna downvote)

Wheat Wizard

6

A: Things to avoid when writing challenges

Consider if your challenge really needs random output Challenges that require random output require extra clarifications that challenges with deterministic output do not, and additionally exclude languages with no source of non-determinism. Often times randomness only acts as a cumbersome outpu...

emanresu A

10:03

Oh, ok

But there's 1977980197799639651080320 possible outputs :P

PyGamer0

CMC: Multiply the input by zero.

No test cases required

pxeger

That's unobservable

Python, 0 bytes. Outputs via exit code

exedraj

@PyGamer0 Vyxal: 0

PyGamer0

@pxeger thats smart

Adám

@PyGamer0 What kind of input?

emanresu A

10:13

Vyxal, 0 bytes - outputs via the 'server' at data:text/plain,0.

PyGamer0

@Adám number

Adám

@PyGamer0 More interesting if an array.

PyGamer0

@Adám ok array

pxeger

@emanresuA that's sneaky lol

Adám

@PyGamer0 Extended Dyalog APL: 0¨

emanresu A

10:19

Vyxal 2.6 (beta) - v0.

exedraj

11:06

@emanresuA wait does that actually work?

emanresu A

Should work

vectorising a nilad = fill

PyGamer0

11:18

CMQ: Tea or coffee?

Adám

@PyGamer0 Both are equally good when ρᵢ → 0

Neil

@PyGamer0 Milk, no sugar.

exedraj

11:40

@PyGamer0 vtc as dupe of the debate I accidentally started when I asked that

The Great Debate over tea and milk and water

Jan 18 at 22:20, 53 minutes total – 137 messages, 9 users, 12 stars

Bookmarked Jan 21 at 3:01 by exedraj

Adám

CMC: Given two lists/arrays/sets/strings/whatever collection type you want, determine if they have any shared elements.

exedraj

@Adám Vyxal: ∩

Adám

@exedraj Really? How do you find their intersection then?

exedraj

That is intersection

Empty list = falsey

Adám

Ah. :-(

exedraj

11:44

List with stuff in it = truthy

@Adám ∩¬¬ if you want a scalar answer

Intersection, not, not

Adám

Right, that's pretty readable.

exedraj

Then I've achieved my primary language design goal :)

Leaky Nun

how do i join?

Adám

@LeakyNun Stay here.

Neil

typical, it's just when I have to leave

rak1507

11:54

@Adám ≢∪ I suppose

if you can answer as 0=no, nonzero=yes

Adám

Ah. :-(

@rak1507 Can you do it in 3 for 1/0?

rak1507

∪≢, ?

Adám

@rak1507 Yup, that's what I had.

rak1507

ah cool

Leaky Nun

@Adám and?

Jo King

12:04

i presume @PyGamer0 and @emanresuA should start posting their drafts?

Adám

@LeakyNun Wait for it…

exedraj

@JoKing emanresuA is gone though

so is pygamer

Jo King

how do BMGs usually work?

exedraj

an RO announces that the BMG is starting, pins that message, and people who posted drafts start putting them here I think

but there's never been a BMG where the drafters aren't present to post the cmcs

oh and there needs to be an announcement in BMG drafts that drafting is closed, and that voting has started

voting lasts for 5/10 minutes I think

Jo King

maybe we should just start posting some of them?

Aaron Miller

12:18

lol I haven't posted an answer in 2 weeks (wait, it's been 2 weeks? dang, it's been a while), but somebody suddenly went and upvoted a bunch of my non-vyxal answers, as well as a bug report I made on MM.

exedraj

Golly, I wonder who it was

Aaron Miller

👀

exedraj

🤔

Aaron Miller

¯\(°_o)/¯

was it you?

Wheat Wizard

1

A: Sandbox for Proposed Challenges

source-layout code-golf Hello, Toroidal Earth! Your task is to create a program that outputs the string: Hello, Toroidal Earth! with an optional trailing newline. Additionally if I remove the first line1 of your program and add it as a line after the end of your program the new program should be...

I think I'm going to post this. Last chance for pre-post feedback.

pxeger

12:26

I agree with JoKing

in most languages it will be extremely hard

and in some it's trivial

Wheat Wizard

Joking stated a fact. I don't know how you can agree with it.

pxeger

I think it's too hard in most languages

and therefore not a very good challenge

Wheat Wizard

Alright.

Aaron Miller

Also, the challenge doesn't specify a minimum line limit, so you could make a one-liner and effectively remove about half the challenge.

Wheat Wizard

I don't actually think that the vertical interchange is very difficult at all. One liners are fine.

pxeger

12:32

if it did specify a minimum line limit, you could just get around it in a lot of languages with blank lines

Aaron Miller

true

so when are we starting BMG?

Browncat Programs

Bleh, is this new?

Wheat Wizard

> Asked 5 years, 5 months ago

Browncat Programs

The formatting, not the question

That was in the review queues

pxeger

@BrowncatPrograms it's not as bright green for me

Wheat Wizard

12:37

I would bet it's new since the spacing is broken.

Browncat Programs

@pxeger It's not the color of green that I'm talking about

pxeger

I know, I'm just saying your screenshot looks weirdly bright

Browncat Programs

I was hovering the link

pxeger

oh ok

(why isn't the cursor in the screenshot then?)

Browncat Programs

The cursor disappears when you're taking a screenshot, but it pretends it's still there so you can screenshot stuff like right click menus

Future project: Make 20 chat bots, then sync them up to rickroll people with chat pings

New Posts

12:45

0

Q: Hello, Torodial Earth!

Your task is to create a program that outputs the string: Hello, Toroidal Earth! with an optional trailing newline. Additionally if I remove the first line1 of your program and add it as a line after the end of your program the new program should be a valid solution to this challenge in the same...

code-golf source-layout hello-world

Sandbox Posts

0

A: Sandbox for Proposed Challenges

Add 2 numbers using a graphics card Introduction Graphics cards have great performance when doing big calculations. So lets make a small calculation Challenge Inputs: 2 floats of choice output: the addition of the two floats. The addition should be calculated on the graphics card, but it doesn...

PyGamer0

ok so has BMG started

Wheat Wizard

🎉

PyGamer0

in BMG Drafts, 4 hours ago, by PyGamer0

Draft: Given a list, find its depth; scalars give 0, while each nested list adds one to the depth. Examples: 4 -> 0; [] -> 1; [2] -> 1; [3, []] -> 2; [1, [3], [[4]]] -> 3

in BMG Drafts, 4 hours ago, by PyGamer0

Draft: Given an array of numbers, square each number then add all of them together and find the square root of the number. Ex: [3,4] -> 5

in BMG Drafts, 4 hours ago, by PyGamer0

Draft: Given two numbers a and b, calculate: a²+b²-2a²b²+a!-b!²

user

@BrowncatPrograms Where is this from? I think I know the user in question irl

exedraj

12:58

@PyGamer0 ²∑√ in vyxal

user

nvm, found it

PyGamer0

@exedraj i was about to the same for 51AC8 but apparently i forgot how the operator precedence works in python, so the square root is just division by 2 lol

25√ == 12.5

exedraj

@PyGamer0 well played

PyGamer0

in BMG Drafts, 4 hours ago, by PyGamer0

Draft: The input is a string. Now encrypt the string by alternatively adding 1 and -1 to each char's ascii value.

@exedraj i should really write unit tests for everything

exedraj

@PyGamer0 Vyxal k: ẏu$e+C

@PyGamer0 it's harder than it seems

purely because it's extremely tedious

PyGamer0

13:09

@exedraj ?

exedraj

Because you have to come up with the test data

and then depending on variable names/structure

you have to write a lot of stuff

PyGamer0

> -a Output into an array, that is printed later.

^ i think that flag is going to help me write unit tests for the interpreter

Browncat Programs

@PyGamer0 JS: s=>[...s].map((c,i)=>String.fromCharCode(c.charCodeAt()+1-i%2*2)).join``

Also morning!

PyGamer0

@BrowncatPrograms night

exedraj

13:24

@BrowncatPrograms v3ery much eys

Browncat Programs

I too have very much eyes

exedraj

yes

I meant yes

and I thought you would have picked up on that

Browncat Programs

I did, but much eyes are more fun :p

Aaron Miller

in BMG Drafts, 1 hour ago, by Aaron Miller

Draft: Given two digits x and y, and a character z, do the following: If z is non-numeric, return a. If int(z) == x return b. If int(z) == y, return c. Otherwise, return d. a b c d can be any distinct, consistent values.

Browncat Programs

(x,y,z)=>+z==+z?z==x?b:z==y?2:3:0, using 0, 1, 2, 3 for a, b, c, d

exedraj

13:41

CMC: Return the first truthy element of a list of integers

Browncat Programs

JS: x=>x.find(d=>d)

user

Scala: _ find 0.!= or _.find(0!=_) if you're sane

exedraj

@user @AaronMiller brownie points if you find my 2 byter in Vyxal

user

Hrm

exedraj

no flags

returns as a single item list

Browncat Programs

13:44

Ash, 1 byte: Ị

exedraj

did you ever actually get as far as implementing the unicode stuff?

Browncat Programs

Yes, dynamics were implemented

exedraj

@user nvm it's 3 bytes lol

Thİ

Browncat Programs

Okay apparently Ị doesn't work

exedraj

Welp tahts enough golf for me for one day

I'll see y'all again tomorrow to feed my potentially unhealthy addiction to code golf and memes

o/

Browncat Programs

13:46

Ḥ_ works

o/

Aaron Miller

@exedraj lol that's what I had and I was freaking out trying to figure out how you outgolfed me

Browncat Programs

Does Vyxal not have a find operator?

Aaron Miller

@BrowncatPrograms ḟ = a.find(b) # Index of

Browncat Programs

There's not one that returns the actual item?

Aaron Miller

wdym?

Browncat Programs

13:52

Like JS's .find

[0, 1, 2, 4].find(x => x == 2) is 2, x == 4 would be 4, etc.

exedraj

That just sounds like ~c* with extra steps

Browncat Programs

Or...with less bytes, which is important for code golf :p

exedraj

And yes I said I was off to bed, I had TNB open while teeth brushing

@BrowncatPrograms I don't think I've ever seen a need for that

Browncat Programs

Wh...what?

.find is one of the most common functions I see in JS code golfing

exedraj

See that's the problem

You're looking at JavaScript

Browncat Programs

13:55

Having a list and needing to find the first item that matches some condition is very common

exedraj

Filter then head also works

Browncat Programs

And takes another byte

exedraj

Actually it doesn't

You're suggesting [...;¢

user

@BrowncatPrograms Gotta agree with Redwolf here

exedraj

(imagine ¢ is find like you say and [ is lambda)

user

13:57

find is incredibly useful

exedraj

@BrowncatPrograms '...;h is the same length

user

I'm not just talking about Scala, it's useful for Husk too

@exedraj Ah, fair enough, although that doesn't work if you don't have a function literal

exedraj

@BrowncatPrograms because filter is a separate structure

Browncat Programs

@exedraj That's just a quirk of vyxal then

user

It's a feature of vyxal

Aaron Miller

13:58

^

exedraj

@user what?

'...; is a filter lambda

user

@exedraj Like if you have a higher order function where the function to filter by comes from elsewhere

exedraj

Then you just do Fh

user

Suppose the function to filter by is in some variable f

Browncat Programs

@exedraj For Ash, all of the dynamics are like that, so filter and find are the same byte count

You never need to explicitly start a function

Neil

13:59

@PyGamer0 Charcoal, 6 bytes: Ｉ₂ΣＸＡ²

Browncat Programs

@BrowncatPrograms Ḥ...} is find, Ḷ...} is filter

BMG Drafts

The Great Debate over tea and milk and water

Transcript for