The Nineteenth Byte

Riker

00:00

Martin could make a "regex for hire, makes regexes to match given criteria and test cases" company prolly

ATaco

"Match all multiples of 13"

a-ta.co is now set up and should start redirecting soon.

Riker

redirect to what?

ATaco

To the webhost.

(Which happens to be a VPS running node.js)

Riker

ah k

algorithm seems to be a very misused tag

ATaco

00:32

a-ta.co is now up!

ASCII-only

@ATaco 400 bad request

ATaco

May be locational, could take some time for the globe to see it.

Riker

times out for me

well it times out 50% of the time and just attempts to load forever the other half

quartata

Works for me.

Downgoat

00:48

Aww yiss, got diffs working on GitGoat

quartata

not bad

ATaco

01:10

Any timing out may happen because I'm also relaunching node a bit.

PhiNotPi

survey: favorite data structure?

ATaco

Stack.

Dennis

flat dictionary

Destructible Lemon

@mınxomaτ well, I'd say it is most unlikely they exist in separate tenths! obviously there is a half chicken and a .6 chicken or something

ATaco

So you're suggesting there exists various divides of chicken?

Downgoat

01:45

@PhiNotPi Tree

DJMcMayhem

01:55

@PhiNotPi I've always thought heaps are really interesting

Anonymous

02:10

@PhiNotPi Deque

Anonymous

Or a samatter

ATaco

02:34

Can everyone confirm this image works?

Anonymous

Looks good to me

Downgoat

02:56

Yup, I see the latex logo

ATaco

Excellent, most of the world should now correctly be re-directing a-ta.co

Wheat Wizard

Does anyone know where GoL was first proven TC?

Alt-F4

$\LaTeX$

ATaco

Alt-F4

$\begin{align}x&=\sum^5_{n=1}n\\&=1 2 3 4 5\\&=15\end{align}$

neat

ATaco

03:12

I'll move chatcommands to a-ta.co soon.

Alt-F4

Cool

Did your other domain expire?

ATaco

Nope, But I wanted a-ta.co

They both lead to the same place.

Alt-F4

a-ta.co times out for me

and I have insanely fast internet

ATaco

It does not currently have a splash page.

So just going to a-ta.co will achieve nothing.

Alt-F4

It should still at least throw 500s...

ATaco

03:15

Nope.

I'm starting the response, but never terminating it.

Downgoat

@ATaco can you change to higher DPI images

ATaco

I can scale it however big you'd like, it's converting from SVG.

How's that for High Resolution?

Downgoat

10/10 that looks better

previously looked grainy on my display

ATaco

I need to tweak it a bit, currently it's greater than 1080p

Observe;

Oh: that actually looks fine.

Alt-F4

Why not just $\LaTeX$?

ATaco

03:19

Oh wait no, refreshed...

Downgoat

Question: could you make it send back an svg with content-type etc. set as so but with .png as the extension?

ATaco

Because $\LaTeX$ isn't supported by those not using my userscripts.

I theoretically can, but StackExchange doesn't seem to correctly handle it.

Downgoat

^ I leave latex extension off because it mangles $ signs

@ATaco Even with Content-Type header?

ATaco

Yeah.

Alt-F4

yeah if you want to discuss how I earned $140 and $110 today selling laptops (true story), then the text will get mangled

ATaco

03:20

Exactly.

Downgoat

@Alt-F4 Wow, 140*and*110

:( doesn't work

Alt-F4

hmmm... can you make it use \\\$ instead of $?

Downgoat

would mess up embedded math blocks in cheddar/VSL code

Alt-F4

hmmm

I don't think it activates on code blocks, let me double check

$test$

no, it doesn't

ATaco

You can also use \$, see: \$

ATaco

03:43

Yeah, even though that's a valid SVG, stack exchange seems to hate it.

Wait, no it doesn't!

Aha!

I need to scale it up a bit, but it's actually using SVG now!

ATaco

03:59

There we go, it's now the perfect size.

I've updated the userscript to use this SVG channel.

Jan Dvorak

05:18

CMC: given a list of integers, return an integer that isn't on the list.

Anonymous

@JanDvorak Actually, 2 bytes: Mu

Jan Dvorak

Max + 1? Nice.

betseg

What is actually written in?

Can't find a GitHub repo etc

Jan Dvorak

05:33

github.com/Mego/Seriously

Anonymous

Python 3 and coffee

Anonymous

Also the GitHub repo is linked on the TIO page

betseg

Ah right

betseg

05:51

w3.org/TR/selectors4/#subject parent selector in W3C CSS Selectors Level 4 Working Draft?!

ATaco

06:38

RProgN2 .`--

Concatenate, remove -'s

Anonymous

@ATaco Fails for single integer input

ATaco

Curses!

Appending ]1’ to the start fixes it, but I don't like it.

betseg

06:54

Python, 24 bytes: lambda l:sum(map(abs,l))

Wanted to make a program that doesn't use the methods posted

Oops, the edited one doesn't work for single input :p

Anonymous

It also doesn't work for [0, N] input (where N is any positive integer)

Anonymous

I think min(L)-1 and max(L)+1 are the only feasible solutions

Fatalize

07:19

@JanDvorak Brachylog, 3 bytes: ≜¬∈

"Take an int value, and not in the list"

Jan Dvorak

speaking of edge cases, how does @Mego's solution handle empty arrays?

Anonymous

@JanDvorak Gah. That's an issue.

Anonymous

3 bytes now: MuΣ

Anonymous

It tries to return an empty array when given an empty array as input, so Σ computes the sum (which is 0). Σ is a NOP on non-iterable data.

Jan Dvorak

Well, it's a NOP now :-)

Would Mu≈ be more future-proof?

Anonymous

07:25

No, because ≈ is a NOP on iterables

Anonymous

It's not even present-proof :P

Anonymous

@JanDvorak I don't expect to overload Σ for non-iterables

mınxomaτ

07:38

TIL MathJax is used by ~200M people every month. Also, their CDN is shutting down.

Also, it generates 70TB/m in bandwidth.

Alt-F4

> shutting down

wat

mınxomaτ

Well, a CDN costs money. CloudFlare bailed out, asking for more money.

Alt-F4

...

BTW I know the person in the photo.

I played SimCity on his iPad when I was 12

Григорий Перельман

@mınxomaτ CDN?

Alt-F4

@ГригорийПерельман Content delivery network

Григорий Перельман

07:46

Oic

Alt-F4

wb

ATaco

a-ta.co now contains a landing page.

Alt-F4

what did you write it in

ATaco

Node.js, it's not a web app

Alt-F4

ah

ATaco

07:56

It also hosts the Mathjax converter, and some other WIP things, but it only now has a landing page

Before it just timed out.

Which may be the worst possible behaviour for that

Alt-F4

yeah should just return 500 in that case

I honestly dont understand the node craze. JS is like the worst language to use on client, now I need to use it on server as well?

wat...

why isn't the web scripting language a neutered version of ruby

Григорий Перельман

@Alt-F4 it's better than php

Alt-F4

@ГригорийПерельман rails

ASCII-only

@Mego TIL Actually is written in ~~Java~~ ~~CoffeeScript~~ coffee

@Alt-F4 well a lot of people don't like Python, Ruby is fine but not C-derived so too weird for most people to be bothered to learn

Dennis

Different strokes for different folks. As much as I dislike JS, I'd rather use JS than Ruby. Not saying Ruby is bad, but I don't know it and it looks difficult to learn.

@ASCII-only Python would actually be my first choice.

Григорий Перельман

08:07

And as we all know, js is the preferred language of goats everywhere.

ASCII-only

@ГригорийПерельман And fish

Григорий Перельман

I'm actually setting up a webserver in the near future to host a webcomic.

ASCII-only

@ГригорийПерельман Just use comicfury to host it

Григорий Перельман

Haven't decided what to use yet.

ASCII-only

@ГригорийПерельман Node + express + nunjucks definitely

Григорий Перельман

08:10

@ASCII-only planning on getting a digital ocean droplet, actually.

ASCII-only

@ГригорийПерельман but comicfury is free :(

Григорий Перельман

I want the experience, and DO is cheap.

Plus the referral link on TIO gives 10 dollars in credit.

ASCII-only

@ГригорийПерельман Oh nice

SIGSEGV

#WeNeedaTShirt

Григорий Перельман

We do?

SIGSEGV

08:19

We have a T-shirt? where?

mınxomaτ

I think that was a question whether we really need a shirt

SIGSEGV

Oh

Okay then

Wait, I have a Community Swag idea

Wait, I think it would be too expensive

The idea was Core i7s signed by Dennis

ASCII-only

@SIGSEGV Yeah it is

SIGSEGV

Sure is

Григорий Перельман

@SIGSEGV why Core i7s? Wouldn't we want something esoteric?

betseg

08:27

8086!

SIGSEGV

@ГригорийПерельман Oh now I have a better idea but f*ck betseg ninja'd me

@betseg 4004?

betseg

That's ok too

Григорий Перельман

I wonder if they can be bought in bulk.

SIGSEGV

dammit am I going too far as 1702A

(It's an EPROM)

TuxCopter

08:58

Yo

@SIGSEGV Something truly esoteric would be a MC14500B

ATaco

09:15

a-ta.co's Favicon is the Mathjax rendering of "favicon.ico" because navigating to a-ta.co/favicon.ico returns an SVG image, that is the MathJax renderer's output.

Kritixi Lithos

So what does a-ta.co do with mathjax?

ATaco

I'm hosting a tool that converts MathJax to SVG, so that those without MathJax can view it.

For example:

And because of this it has some strange behaviours as a site.

As I said before, the landing page has a Favicon that is MathJax rendering "favicon.ico"

ASCII-only

@ATaco +1 good job

ATaco

Because, as I said before, trying to navigate to a-ta.co/favicon.ico produces an (svg) image, which is more than enough for most browsers.

ASCII-only

@ATaco but why does it even serve that, shouldn't it not convert if the request extension is nto svg?

ATaco

09:27

Wait, in this case it's serving a png, not an svg.

Which is still a valid ico, apparently.

If you make the content header image/png, I guess.

ASCII-only

@ATaco TIL you're a person, I always thought you were a ~~lemon~~ taco

ATaco

I plan on correcting that Landing Page.

Kritixi Lithos

@ATaco so how do you type out the equation in order to convert it to an svg?

ATaco

My chat commands userscript allows you to use /$LaTeX$, alternatively, a-ta.co/mathjax/ANYTHING will work, assuming that ANYTHING is URIEncoded LaTeX. A .svg at the end is optional, as is the /mathjax

I hope that last message sent.

ASCII-only

09:43

@ATaco makes it sound like you made it for golfing purposes :P

btw IMO you should have an input box where users can enter LaTeX, and then redirect on button click

ATaco

Good idea, but right now it can be generated with not too much javascript anyway.

src = `a-ta.co/mathjax/${encodeURI(LaTeX)}`

Also, the landing page has been improved.

Kritixi Lithos

> The worlds greatest coder.

Missed an '

ATaco

Not that you can prove.

betseg

@ATaco I though "citation needed" was a link :(

ATaco

09:58

That was intentional, I might make it a link.

ATaco

10:15

a-ta.co/generator

Try that.

ASCII-only

@ATaco Why is default \\Latexnot \Latex, and why does it say Imigifier not Imagifier

ATaco

I fixed both of those things.

And it's because I'm writing this on the fly.

I've also made the input a textarea.

Kritixi Lithos

@StewieGriffin Running eval(101) works fine on TIO, but doing so on my machine gives an error. Do you know why?

ASCII-only

@KritixiLithos What language

ATaco

Yay, Collatz Conjecture!

Kritixi Lithos

10:27

@ASCII-only Octave

ATaco

And because it's SVG, you get that crisp drawing at any resolution.

SIGSEGV

10:53

I'm trying to do something which shouldn't be possible

ATaco

OoOo, let's hear it.

SIGSEGV

xwindows on LSW (Linux Subsystem on Windows)

Installing xinit now

ATaco

Good luck.

I'm currently working on a system to make math.js into SVG images.

It uh, could use some work.

ASCII-only

@SIGSEGV xwindows?

SIGSEGV

@ASCII-only In other words, GUI mode

ASCII-only

10:55

@SIGSEGV Don't you mean WSL, Windows Subsystem for Linux

SIGSEGV

whatever

ASCII-only

@SIGSEGV That's easy, I use sublime on WSL with VcXsrv pretty much every day

SIGSEGV

@ASCII-only That's easy for me too, but FULL GUI (including home and such)

ASCII-only

@SIGSEGV oh

@SIGSEGV github.com/microsoft/bashonwindows/issues/637

Jan Dvorak

Windows has a bash built in, Linux has Wine and WSL, I take it the only difference is price, UI and update policy now?

SIGSEGV

10:59

@ASCII-only bugs out

ASCII-only

@SIGSEGV reddit.com/r/Windows10/comments/4rsmzp/…

@JanDvorak wat, windows bash built in is WSL

Linux doesn't have WSL

Jan Dvorak

oh. I thought the Windows Subsystem for Linux would be on Linux...

ASCII-only

@JanDvorak ... why would Linux release any proprietary software?

Jan Dvorak

The name is really confusing if it's this way around...

SIGSEGV

whew

chrome hates me

ASCII-only

11:02

@SIGSEGV ?

SIGSEGV

or is it the laptop with an i7 4th gen

@ASCII-only link works now

it was just my laptop

Stewie Griffin

@KritixiLithos I don't know, there are several difference between TIO and my local version. For instance: On my locak computer: ['Helloo', 9, ', World!!', 9] results in Hello, World!, because 9 is treated as backspace in the code. This doesn't work on TIO (or any other online interpreters I've seen).

ATaco

That's because HTML doesn't read BS like a command prompt will.

Stewie Griffin

Comment from earlier:

Just curious, do you have any idea why the online interpreters output differently? (I got PPCGHHelllo WWorld from TIO) — Kritixi Lithos Jan 27 at 18:25

Kritixi Lithos

9 gives me tabs, but using 8 instead results in Hello, World!!

Stewie Griffin

11:06

Oops, I meant 8. I don't have Octave on this computer, so I took it of the top of my hat.

Kritixi Lithos

@StewieGriffin lol

ATaco

Just gotta read it by the bytes my friend, forget all you know about encodings.

Stewie Griffin

Hi, I'm Stewie and I don't know the ASCII-table by heart.

ATaco

Hello, World! is an illusion.

Kritixi Lithos

@KritixiLithos The extra ! is not deleted

ATaco

11:08

And all you need to know is A = 65, a = 97, and 0 = 48

Oh, and * = 42.

Don't know why you need to know that.

But you do.

Kritixi Lithos

@ATaco easy way of remembering that: A is 0x41, a is 0x61 and 0 is 0x30 (correct me if I'm wrong)

ATaco

Yep, bullseye.

flawr

soyuz landing in progress, touchdown expected in about 10 min

Jan Dvorak

Please remind me of the 4x physical acceleration key shortcut

Kritixi Lithos

@flawr that's a lot of swearing in the comments

Jan Dvorak

11:14

How do they make it land where they want?

flawr

@JanDvorak pushing the right buttons at the right moment

Jan Dvorak

Pretty good graphics mod, though. They even made the parachute bob!

What's the airspeed?

dat touchdown...

betseg

11:39

@JanDvorak lel

Destructible Lemon

@erik...

have you ever actually outgolfed someone?

TuxCopter

@flawr The chat is beautiful

Kritixi Lithos

31 mins ago, by Kritixi Lithos

@flawr that's a lot of swearing in the comments

TuxCopter

So many flat earthers too

Erik the Outgolfer

pfft, can't make a quote

Kritixi Lithos

11:47

> oh really?

Erik the Outgolfer

I'm going to the Sandbox rn.

Destructible Lemon

@EriktheOutgolfer have you though?

SIGSEGV

18 secs ago, by SIGSEGV

13 secs ago, by SIGSEGV

hmm

Erik the Outgolfer

Sandbox

Where you can play with chat features (except flagging) and ch...

3

flawr

@KritixiLithos beauty is in the eye of the beholder

New Sandboxed Posts

13:16

0

A: Sandbox for Proposed Challenges

Verify Eigenpairs In this challenge, you will be given a matrix A, a vector v, and a scalar λ. You will be required to determine if (λ, v) is an eigenpair corresponding to A; that is, whether or not Av = λv. Dot Product The dot product of two vectors is the sum of element-wise multiplication. ...

Kritixi Lithos

13:29

I've been looking at a graphical-output solution to this challenge. It works, but it is invalidated by the rule that there can only be 1 hash per line. So I'm posting it here:

void setup(){size(99,99);
noSmooth();int x=parseInt(args[0]),y=parseInt(args[1]),j=y,i;line(1,1,x,y);for(;j>0;j--){print("|");for(i=x;i>0;)print(get(i--,j)==color(0)?"#":" ");print("|\n");}}

Processing 3, 190 bytes

New Main Posts

-1

Q: Challenge to people in Python 3 coding

I was just wondering if anyone can draw the Korean flag into 4 different square blocks. So that the flag is divided into 4 squares i.e. top left, top right, bottom left and bottom right squares. The blocks need to be conjoined together. So far I have this done: If anyone could help me out ...

0

Q: How much reputation does a steam user have?

For those not familiar with steam - or at least this particular aspect: Often on peoples' profiles, people leave comments saying either "+rep _____" or "-rep _____". These are a non-official means of showing if you think someone in the community has a good or bad reputation, for a number of reas...

string counting

Riker

13:46

@HyperNeutrino just because each line will contain that, doesn't mean the line can't contain multiple

the question is unclear regarding that

user165474

@Riker Yes, I agree now. I see where the confusion is; it is worded unclearly.

Riker

yea

user165474

Will wait for OP to clarify.

Riker

I've added another version to the post

lambda n:sum([i.startswith('+')*2-1 for i in n)]) works for only counting the starting occurences

@HyperNeutrino ""Each line of the text will start with either "+rep" or "-rep". The rest of the line could contain anything."

user165474

@Riker Well nevermind it just got put on hold. rip

Riker

13:57

.... and OP contradicts himself too

> Each line of the text will start with either "+rep" or "-rep".

> If the line contains neither, it should be ignored.

user165474

Yes.

SIGSEGV

Too bad, It should've been a dupe hammer.

Riker

@Riley sigh I thought I left that comment at first, but was confused. I opened up the challenge to leave a comment saying it's a contradiction, saw your name, and thought I just had a really bad memory

@SIGSEGV not quite

depends on if it needs on the first of the line or not

if it doesn't, it's a dupe yeah

user165474

It's not quite a dupe.

fəˈnɛtɪk

I think they meant for each line, if it starts with +rep add 1, -rep subtract 1, neither do nothing.

user165474

14:02

@fəˈnɛtɪk I think so too, but the spec says "Each line of the text will start with either "+rep" or "-rep".

SIGSEGV

@Riker Checking for +/-rep on first of the line, everything else is indifferent

Riker

yeah

@fəˈnɛtɪk I think so, yeah

SIGSEGV

so its a dupe for me

Riker

not for me and I'm fairly certain non dupe voters outnumber you

fəˈnɛtɪk

@SIGSEGV You should really read the question you are calling it a dupe of

Riker

14:02

but maybe not

fəˈnɛtɪk

The stack exchange one is treating it as if a single user is pressing the upvote/downvote buttons, therefore they can self cancel

downvote on -1 goes to 0 because it removes the downvote

user165474

++++++++++ returns 0 on the SE one and 10 on the new one.

user165474

So definitely not a dupe.

SIGSEGV

Umm

ok

but I'm sure there is another dupe

user165474

Sounds likely that there'd be a dupe somewhere

user165474

14:08

I mean, it's a really simple and trivial challenge; I'd expect one to exist somewhere already.

user165474

Any thoughts on this? codegolf.meta.stackexchange.com/a/12048/42649

Riker

@HyperNeutrino remind me later when it's not early morning

Jan Dvorak

It's always morning on the Internet

user165474

@Riker Alright. Timezone?

Riker

PDT

user165474

14:13

Okay.

Riker

it's 7 am here, but I'm still a bit jetlagged

user165474

From where?

Riker

east coast

user165474

Ah. Nice.

user165474

I'll remind you at UTC midnight

user165474

14:15

8pm for me

user165474

so 5pm for you

Riker

cool

New Main Posts

0

Q: Let's do some location arithmetic!

From the Wikipedia article: Location arithmetic (Latin arithmeticæ localis) is the additive (non-positional) binary numeral systems, which John Napier explored as a computation technique in his treatise Rabdology (1617), both symbolically and on a chessboard-like grid. What?? Location nume...

code-golf math number arithmetic

user165474

@NewMainPosts This looks like an interesting challenge.

Riker

@flawr r/emojilang

feersum

14:40

I am feeling pleased with myself.

I forgot my IRC password

but had a phone app with the credentials

Riker

lol

feersum

I couldn't copy from the password field or make it visible,

So I connected to my local network and changed the settings so that the server address was my desktop

And opened a TCP socket with python.

user165474

...

Riker

sigh

this, folks, is why you remember stuff

feersum

The password was conveniently in the first packet so I didn't have to fiddle with sending any response.

Riker

14:42

and/or create a new account every time I need to log in again

feersum

This was a lot more fun than just remembering it.

DJMcMayhem

Sadly, this is a true story. At least I learned about the OS X 'say' command.

5

Jan Dvorak

If the phone app used SSL, you'd be screwed

As for faking a server - why not just set up a logging proxy?

feersum

I do use normally, but I turned off TLS in the settings before connecting.

Jan Dvorak

cough fiddler cough

betseg

14:46

reddit.com/r/WritingPrompts/comments/5xev06/slug/dei4xn1

feersum

I actually tried Wireshark first, but I apparently was too stupid to use it right.

betseg

One of the best subreddits^^

feersum

I couldn't see the password in the dump.

Do you guys see an equivalent of the doorbeel in this case?

Jan Dvorak

Do tell

fəˈnɛtɪk

What should be done if someone has declared their answer safe and posted the answer prior to the unsafe period ending codegolf.stackexchange.com/a/115338/64505

There is still 1 hour before it should be safe

Sandbox

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