The Nineteenth Byte

The usual correlation coefficient (in 2d) measures how well a set of points can be described by a line, and if yes, its sign tells us whether we have a positive or negative correlation. But this assumes that coordinates of the points can actually interpreted quantitatively for instance as measure...

Mr. Xcoder

@StepHen thanks

Poke

I could def see that in a first year class

Magic Octopus Urn

@Poke I was the only one to touch the code on our capstone final project ._.

Step Hen

8:12 PM

@MagicOctopusUrn I could interpret that two different ways :P

Poke

yowch

Step Hen

@MagicOctopusUrn you know I would like that, that way no one else screws it up and I don't have to do any paperwork or anything

Magic Octopus Urn

@Poke I did make them do 100% of the diagramming for the SSR.

@StepHen the only reason I did it was that I forced them to do the documentation.

Mr. Xcoder

We shall reopen this

IDK why it was closed

Magic Octopus Urn

Could've just as easily reported them to the dean/professor... but I'm not like that.

Poke

8:13 PM

what was your capstone

Step Hen

@MagicOctopusUrn eh your prof probably knew you did all of it anyway

I hope we are taught and are forced to use Git for that kind of stuff

Magic Octopus Urn

We actually were programming a "Labor Progress Monitoring System" which would track the dilation of a first-time mother throughout the labor process... It was basically automating a pen-and-paper process. The doctors would graph the woman's dilation and our program would calculate if a c-section would be more safe than natural birth.

Any woman who's had a c-section before automatically will have c-sections on all subsequent births.

Poke

were you doing it for some company or was it an inhouse idea

Downgoat

Question: should we be allowed to call JS functions through setting their this? e.g. [1,2,3]::[].map(i => i + 1) is [2, 3, 4] @ConorO'Brien @ETHproductions

Magic Octopus Urn

Was for the OSU medical university.

You ever heard of eatstreet?

Poke

8:15 PM

that's neat

negative

Magic Octopus Urn

EatStreet came from our Capstone class.

Well, part of it.

Poke

wow, that's pretty cool

Magic Octopus Urn

But the people who took that project got hired by the company offering it.

To continue development on it.

Downgoat

I don't think we have a related entry in I/O post. but it is a standard JS call

Magic Octopus Urn

B/c they were like 1/5 done.

Poke

8:16 PM

i probably could have gotten a job from the company that my senior project was for

but i didn't apply

<.<

Downgoat

pls can we on-topic conversation first

Magic Octopus Urn

Sorry, my b.

Mr. Xcoder

CMC: Given a list, return the list of sums of two consecutive elements

[1,2,3,4] -> [3,5,7]

Adám

@Mr.Xcoder APL: 2+/⎕

Mr. Xcoder

Nice, very golfy

Conor O'Brien

8:24 PM

@Downgoat you confuse me

Adám

@Mr.Xcoder Well, f/ is f-reduction, nf/ is f-reduction in sliding window of size n.

@Pavel APL: -/

Conor O'Brien

what does the box do?

Adnan

@Mr.Xcoder 05AB1E, 2 bytes: ü+

Conor O'Brien

it has to be 2+/\] in J

flawr

Where is @LuisMendo hiding???

Mr. Xcoder

8:28 PM

Brownie points if you outgolf me in Python

@Adnan I have the same solution +1

Adnan

nice :)

Adám

@HyperNeutrino QuadR:

Code:
C
CMC
Input:
CMC
Arguments:
n

Mr. Xcoder

Gtg (or brb maybe?)

HyperNeutrino

Can anyone think of a case in a language like Java or C where semicolons are required where something that isn't a single node on an AST (as in a single expression) would occur before a semicolon as a single statement?

Downgoat

@ConorO'Brien like using func.call(this)

Adám

8:29 PM

@ConorO'Brien Prompts for input. Could be ⊢ too to be a tacit function (identical to your J function)

Conor O'Brien

@Downgoat what are you asking me?

Downgoat

do you know if it is allowed

Conor O'Brien

@Adám ah, I see. (1) APL evaluates input? (2) does / function as J's `/`?

@Downgoat give me an example?

Downgoat

([].reverse).call([1,2,3])

HyperNeutrino

Jelly: ṡ2S€

Adám

8:30 PM

@ConorO'Brien (1) ⎕ is evaluated input, ⍞ is text input (see the quote char?) (2) Yes, or the other way around really.

Conor O'Brien

oh cool

flawr

@LuisMendo What is the shortest way to produce [-1,0,1] in MATL (or any permutation thereof)?

HyperNeutrino

derp ._.

Luis Mendo

@flawr You can do I:2-

HyperNeutrino

I just realized that I was struggling with a part of my parser that's completely useless

Adám

8:33 PM

@ConorO'Brien Actually, only the monadic derived function. J's X f/ Y is X ∘.f Y in APL.

@flawr CMC: [-1,0,1]

Luis Mendo

@flawr Actually the more explicit -1:1 has the same length

New Main Posts

0

Q: Minimal taxicab distance map

Challenge description In taxicab metric, a distance between two points is defined as: Consider a matrix with only zeros and ones: 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 0 Let's map each 1 to the distance to nearest different 1 in the matrix (of course, assuming that distance betw...

code-golf matrix binary-matrix

Conor O'Brien

@Adám i:1

in j

Adám

@ConorO'Brien That's right, J has a built-in for this.

Conor O'Brien

I like that builtin

flawr

8:34 PM

@LuisMendo oh no, I missed the obvious....

Anyway thanks:)

Luis Mendo

Anytime!

flawr

I was trying to shorten your answer, but it doesn't work:)

you know something like prod(n + [-1,0,1])

Mr. Xcoder

@LuisMendo Do you have easy challenges for first-time MATL learners (or suggestions)?

Adám

@Okx APL: ⍴⍨ J: $~

Jordan

Ahoy!

Mr. Xcoder

8:36 PM

Hi

HyperNeutrino

@StepHen New challenge for you to do in Taxi and get a thousand upvotes ಠ_ಠ

Mr. Xcoder

@StepHen You are not allowed to solve it in Taxi!

HyperNeutrino

lol

Luis Mendo

@Mr.Xcoder Not specifically for MATL, but any simple challenge (Fibonacci, Goldbach) may be worth a try. There's the MATL room, where tips can occasionally be found, but it's not particularly focused on beginners. Anyway, just ask me anything you need to know

Step Hen

Afaik Taxi doesn't have arrays

Conor O'Brien

8:39 PM

CMC: A029908 - Starting with n, repeatedly sum prime factors (with multiplicity) until reaching 0 or a fixed point.

Mr. Xcoder

@LuisMendo Thanks a lot!

Step Hen

So that would be utterly horrible to implement

Mr. Xcoder

Yay, no new xkcd!

Step Hen

And Taxi can only take three inputs

And it can only break strings into chars, nothing else

HyperNeutrino

Jelly: ÆfS$ÐL

Luis Mendo

8:41 PM

@flawr I hadn't thought of that. But as you say it seems to be longer

HyperNeutrino

literally "sum prime factors until results are no longer unique" :3

Jordan

Beginner Befunge-98 Challenges?

Step Hen

CMC: Name a language that has a do... until <condition is true> loop structure

Mr. Xcoder

@StepHen Haskell

Mathematica

Uriel

@StepHen perl has unless

Mr. Xcoder

8:44 PM

I guess the new challenge is 10 bytes in MATL or so

Magic Octopus Urn

Im bored >_>

Mr. Xcoder

@MagicOctopusUrn Solve the new challenge

Magic Octopus Urn

There aren't any ascii-art challenges that are new.

Conor O'Brien

solve my old challenges

Mr. Xcoder

@MagicOctopusUrn Try this one

Magic Octopus Urn

8:49 PM

I would but me and adnan alread ydid

Mr. Xcoder

Solve it in another language

Step Hen

@MagicOctopusUrn solve this:

17

Q: Mow a Rectangular Lawn

A lawn is defined as a rectangular field with of one character surrounded by two layers of visible whitespace. This means two lines above and twos lines below, and a two space padding on the left (the right has visible whitespace, so you do not need to include it). ||||| ||||| ||||...

code-golf ascii-art kolmogorov-complexity animation

Magic Octopus Urn

Adnan posted that answer b/c we were talking through it in chat about how to use the new 05AB1E canvas.

HyperNeutrino

@StepHen It's essentially do ... while <condition is false>

betseg

@StepHen does do { ... } while ( !( cond ) ) count

Step Hen

8:50 PM

@HyperNeutrino I know, which is why it's pointless than a language would have a builtlin until

The language I'm talking about is Visual Basic

betseg

srsly ninja'd ^^^^? :(

HyperNeutrino

yep :3

Magic Octopus Urn

I want another crazy challenge like the periodic table challenge lol

HyperNeutrino

Does a KoTH count :3

betseg

CMC: print the string "crazy"

HyperNeutrino

8:51 PM

@betseg "crazy"

Magic Octopus Urn

What does CMC mean

Step Hen

@betseg print("crazy")

HyperNeutrino

wait that doesn't count

does it?

Mr. Xcoder

@MagicOctopusUrn CHAT-mini-challenge

dzaima

@betseg SOGL, 4 bytes: 1z⁵‘

Step Hen

8:52 PM

@MagicOctopusUrn Chat Mini Challenge

betseg

chat* mini challenge

ATaco

@HyperNeutrino It does in RProgN!

HyperNeutrino

Java: interface M{static void main(String[]a){System.out.print("crazy");}}

@ATaco \o/ I can program in RProgN now! /s

Step Hen

@HyperNeutrino s->"crazy"

Mr. Xcoder

@HyperNeutrino _=>"crazy"?

Magic Octopus Urn

8:52 PM

@betseg “©„“

HyperNeutrino

@StepHen shhh that's too golfy

betseg

@HyperNeutrino f=>"crazy?

Step Hen

@Mr.Xcoder that's JavaScript sorry

Luis Mendo

@Mr.Xcoder The taxicab? I'm at 17 currently. But I won't post it yet in case you want to give it a try

ATaco

"crazy

Step Hen

8:53 PM

@betseg that's also JavaScript

ATaco

Get golf'd on son.

betseg

oh for golf's sake ninja'd 3 times in a row

HyperNeutrino

no stahp it's -> not => and besides if it's that short then it's not Java

Mr. Xcoder

@LuisMendo Not a chance, I know way too little MATL. Post it.

Adnan

Magic Octopus Urn

8:53 PM

THAT WORKS?!?!

Adnan

yeah haha

Mr. Xcoder

@ATaco Polyglot with 05AB1E, Pyth and Pyke.

Magic Octopus Urn

-expletive deleted-

ATaco

Fear languages with Dictionary Compression.

HyperNeutrino

lol

Magic Octopus Urn

8:53 PM

I definitely needed to know that in a few challenges.

Mr. Xcoder

That moment when you write a python script to format a matrix into a nested list >_>

Magic Octopus Urn

No wonder when I tried to run crap like this: "RANDOM 05AB1E CODEPAGE CHARACTERS".V It would output random words then execute the words lol

ATaco

One does not simply format the matrix.

Luis Mendo

@Mr.Xcoder Ok, done

Mr. Xcoder

I saw

HyperNeutrino

8:55 PM

CMP: What should I name my new language? (Originally designed as a redesign of Positron but too different to call by a similar name)

Mr. Xcoder

and upvoted already

@HyperNeutrino chat-mini-poll?

Magic Octopus Urn

Negitron?

HyperNeutrino

yup

@MagicOctopusUrn no ಠ_ಠ

Magic Octopus Urn

Negatron*?

HyperNeutrino

Positron <=> Electron

Magic Octopus Urn

8:56 PM

Excuse me for not sciencing.

HyperNeutrino

:P

Mr. Xcoder

@HyperNeutrino Higgs boson?

HyperNeutrino

ಠ_ಠ

Mr. Xcoder

@LuisMendo Why'd delete that?

Luis Mendo

@Mr.Xcoder Yes, I was using Euclidean, not taxicab distance. It will be longer

Fixing it

Magic Octopus Urn

8:57 PM

antielectron?

Mr. Xcoder

That's no reason for deletion

HyperNeutrino

An antielectron IS a positron lol

Magic Octopus Urn

Well it's another word fo rpositron that isn't positron.

Mr. Xcoder

Do you learn subatomic Physics in the 9th grade or so?

HyperNeutrino

Positrons are antimatter and they have opposite charge meaning that a positron and an electron will annihilate into radiation

Step Hen

8:58 PM

@HyperNeutrino Just call it Proton

HyperNeutrino

@Mr.Xcoder No. School doesn't teach that for another while.

Mr. Xcoder

We learn it in the 12th grade lol

HyperNeutrino

hm interesting idea

@Mr.Xcoder lol. I just read things from books and wikipedia

Magic Octopus Urn

My friggin high school curriculum... I had to opt into so many AP classes to even get basically challenged. They offered like NOTHING.

Mr. Xcoder

Me too (just curious)

ATaco

8:58 PM

We did it in eleventh and I barely paid attention.

Step Hen

@MagicOctopusUrn I'm so glad I was homeschooled

Magic Octopus Urn

We learned goddamn geometry in 9th grade.

HyperNeutrino

@MagicOctopusUrn I was very bored in my Grade 9 Pre-AP Science and Math class :P I was so bored by Grade 9 Pre-AP Math that I just skipped it

(just as in "taking about 3 months given the stupidity of school systems")

Mr. Xcoder

At least you have the option to OPT for subjects in school! We don't

Step Hen

@HyperNeutrino "Pre-AP" ...

HyperNeutrino

8:59 PM

?

That's what it's called?

Step Hen

what is that supposed to mean

HyperNeutrino

Or is that just a Canadian thing

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