The Nineteenth Byte

5:00 PM

CMC: Given an array of 3 or more dimensions, reverse it and flatten each element. E.g. [[[1,2],[3,4]],[[5,6],[7,8]],[[9,10],[11,12]]] → [[9,10,11,12],[5,6,7,8],[1,2,3,4]]

caird coinheringaahing

@Pavel I still can't decide whether it;s good or bad that it works in hyperlinks too: codegolf.stackexchange.comლ(ಠ益ಠლ)-does-this-work

Pavel

@cairdcoinheringaahing Your chat commands is probably outdated

caird coinheringaahing

@Adám Jelly, 3 bytes Ẏ€Ṛ

Cows quack

@Adám is this what you mean, ∊¨⌽?

HyperNeutrino

I had ṚF€

J. Sallé

5:04 PM

@Cowsquack yes

HyperNeutrino

but that might be wrong depending on "flatten each element"

Adám

@Cowsquack Yeah, you could do that, but if you take the argument as an actual high-rank array, you can do it in two bytes.

J. Sallé

@Adám like so? (((1 2)(3 4))((5 6)(7 8))((9 10)(11 12)))

Adám

@J.Sallé No, that's a deep depth array: 3 2 2⍴⍳12

HyperNeutrino

we had the ontario literacy test (OSSLT) yesterday and it's been 25 hours since it was done and there's an instagram OSSLT meme page with almost 18k followers already o_O

J. Sallé

5:06 PM

@Adám ah, I see. What would be the high-rank array?

Adám

@J.Sallé 3 2 2⍴⍳12 is a high rank array. ((1 2)(3 4))((5 6)(7 8))((9 10)(11 12)) is a deep depth array.

J. Sallé

@Adám oh, I just noticed that. Duh >.>

Adám

Hint:

12 mins ago, by Pavel

There's also ones for /o_o (ಠ_ಠ), /tableflip, and a few others.

caird coinheringaahing

ಠ_ಠ That's annoying: giving out a bounty doesn't tell you any positive rep changes from that same day, until you regain the bounty amount

J. Sallé

@Adám still trying to figure out the 2 byter

Adám

5:10 PM

Announcement: APL Cultivation in 20 mins.

DJMcMayhem

@cairdcoinheringaahing That annoys me too

HyperNeutrino

oh yeah I need to remember to assign my bounty at some point before tmr lol

Adám

@J.Sallé I gave you a hint, but there's not much to figure out. APL has primitives for those two exact operations.

caird coinheringaahing

Random, obvious, piece of advice: don't wear 3 hoodies when inside. It gets hot fast

J. Sallé

@Adám yeah, but I can't seem to make them do what you asked for >.>

DJMcMayhem

5:13 PM

@cairdcoinheringaahing Random question (I got in an argument about this the other day): Can hoodies have zippers?

Or does having a zipper make become a jacket?

caird coinheringaahing

Yes. I have three zippered hoodies on as I type

Adám

@J.Sallé What have you tried?

J. Sallé

@cairdcoinheringaahing ಠ_ಠ why?

caird coinheringaahing

@DJMcMayhem Would you consider this a jacket?

@J.Sallé My heating's off

DJMcMayhem

No. I would consider that a hoodie

J. Sallé

5:14 PM

@Adám well, at first, multiple combinations of ⌽∊, but they don't work without the ¨, now I'm meddling with ↑↓ too

Soaku

But it has a zipper

caird coinheringaahing

@DJMcMayhem Ah, I forgot to ask, which side were you arguing for?

DJMcMayhem

I was arguing that they can have zippers

Adám

@J.Sallé ∊ flattens everything, but APL literally has a build in for flattening the major cells of an array.

J. Sallé

@DJMcMayhem I always thought that the prerequisite to be a hood ie was for it to have a hood

Soaku

5:16 PM

^

DJMcMayhem

Yeah, but what about articles of clothing that contain hoods and zippers?

caird coinheringaahing

Depends on it's purpose. Jackets are for outdoors, in rain and such. Hoodies are to keep warm, and are usually not waterproof

J. Sallé

@Adám I don't think I've ever used it? >.> not for that purpose, for sure

@DJMcMayhem I'd probably just call it a hoodie anyway.

because it has a hood

no hood → not a hoodie in my book

Adám

@J.Sallé I see, you missed Lesson 9.

Erik the Outgolfer

@Adám I thought I'd submit my APL solution, but is it time to spoil it :P

caird coinheringaahing

5:22 PM

Add a spoiler link

Adám

@EriktheOutgolfer It is so basic – go ahead!

J. Sallé

@Adám ah, yes

Erik the Outgolfer

@Adám alright: ⍪⊖

(btw I'd have spoiled it either way)

Adám

@EriktheOutgolfer Yup; literally "table flip".

J. Sallé

@Adám lol

Erik the Outgolfer

5:24 PM

@Adám wait isn't ⊖ called Reverse First in APL lingo?

I see what you tried over there...

Adám

@EriktheOutgolfer Yes, in Dyalog, officially, though we're not strict about it. I call it flip, as it flips upside down, as opposed to ⌽ which reverses sideways (⌽ could also be called mirror).

Mirror and flip makes it much more obvious which way the reversal is happening.

J. Sallé

@Adám I agree.

Adám

Even our documentation manager calls ⍟ Splat instead of Log, though I think it looks like a cut-through tree log.

Erik the Outgolfer

@Adám I thought it was used as starbait...

Pavel

5:41 PM

Is it just me or does cpan install tend to take absolutely forever

New Sandboxed Posts

5:52 PM

0

A: Sandbox for Proposed Challenges

Polynominal -> Integrate Given a rational polynominal with one argument, output an expression with only 1, definite integral, and variables, that equals to it. Reasonable input/output method allowed Samples: TODO: decide scoring (must be related to code length, possibly related to the numbe...

Pavel

6:04 PM

@Adám Personally my vote is on Splat

Adám

@Pavel Well, "splat" is kind of an antonym of "power".

Erik the Outgolfer

@Adám and, well, logs aren't supposed to "splat" anyway :P

Pavel

Does APL have the kind of Splat (*) operator found in e.g. Python, where [1, *[2, 3], 4] => [1, 2, 3, 4]?

Adám

@Pavel ∊ or ⊃?

Erik the Outgolfer

@Pavel definitely no, but there's no need to anyway

and f(a, b, c, d) isn't a case, since APL has either niladic, monadic or dyadic functions

Pavel

6:08 PM

I'm talking specifically about list splats and not call splats

@Adám Right, ⊃ is Disclose, I think?

Adám

@Pavel Yes, or First, if the argument isn't enclosed.

Erik the Outgolfer

in Dyalog it's First, in NARS2000 it's Disclose IIRC and more generally it's Right [Horse]Shoe

Adám

@EriktheOutgolfer No, in Dyalog it is First and in NARS2000 is Mix. Both those functions causes it to be Disclose when applied to a scalar nested array.

Just like ↑ is Mix in Dyalog and First in NARS, with the same effect on a scalar nested array.

I can explain why Dyalog's choice is better after the lesson.

totallyhuman

6:27 PM

CMC: Evaluate and output an interval notation expression. [5, 9] → [5, 6, 7, 8, 9], (3, 6] → [4, 5, 6], (1, 2) → []

@totallyhuman Main!

You really think?

yes me too

Yep

and by "main" I mean "sandbox" of course

totallyhuman

6:30 PM

Huh, okay, drafting.

New Main Posts

6:45 PM

4

Q: Alphabet Histogram

Given an input sentence consisting of words [a-z]+ and spaces , output an ASCII-art histogram of the letter distribution of the input sentence. The histogram must be laid out horizontally (i.e., the letter key along the bottom in alphabetical order), with a Y-axis labeled 1- and every 5 units. T...

Pavel

@totallyhuman I think you should make the delimiter between the two values be either just space, just comma, or leave it up to the answerer.

New Sandboxed Posts

7:02 PM

0

A: Sandbox for Proposed Challenges

Survival Game: Alien Hunters (working title) king-of-the-hill java Based on Create Your Wolf, but the combat is very different. Somewhere, deep in the heart of the galaxy, lies the planet Oizys. A toroidal planet in the habitable zone of its star, its bountiful land and beautiful oceans make...

orlp

7:30 PM

Hadwiger–Nelson problem

In geometric graph theory, the Hadwiger–Nelson problem, named after Hugo Hadwiger and Edward Nelson, asks for the minimum number of colors required to color the plane such that no two points at distance 1 from each other have the same color. The answer is unknown, but has been narrowed down to one of the numbers 5, 6 or 7. The correct value may actually depend on the choice of axioms for set theory. The question can be phrased in graph theoretic terms as follows. Let G be the unit distance graph of the plane: an infinite graph with all points of the plane as vertices and with an edge between two...

caird coinheringaahing

ಠ_ಠ Stax ruins restricted-source challenge with it's packed mode. It's a clever way of saving bytes, but it feels like cheating when done to circumvent the rules.

H.PWiz

7:49 PM

@cairdcoinheringaahing Not really, for most restricted source challenges you want to have controll over what characters are used in what order. packedstax is awful for that.

AdmBorkBork

@cairdcoinheringaahing Just being a pedant, you probably meant pedant and not pendant. I don't think you meant you're a necklace. ;-)

dzaima

@H.PWiz if the challenge requests less ASCII characters, packed stax is great. And if it just needs some combinations of characters, adding garbage changes everything easily

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Count the Matches code-golf combinatorics regular-expression Given a stripped-down regular expression, estimate (rules below) the number of ASCII-only strings that it matches fully (meaning it matches the whole string). You should handle the following: Literals Vertical bars ...|... Captur...

AdmBorkBork

Can honestly say I didn't expect so many comments after posting to main, since I had precisely one comment after more than a week in the sandbox. :-/

caird coinheringaahing

8:06 PM

@AdmBorkBork I can be a necklace if I want :P

AdmBorkBork

Holy cow, that Stax answer is short.

caird coinheringaahing

Damn, too late to edit. deletes comment

@AdmBorkBork Even more impressive: packing it only saves 7 bytes.

Yay for stupidly long answers :P

FrownyFrog

@Adám J can’t do that. the inverse of prepend 0 just drops the first element

Bummer

Adám

@FrownyFrog I know. That makes APL slower, but much cooler.

AdmBorkBork

At least the non-golflang answers are coming in about where I was expecting (I was guessing that JavaScript/Python/etc. would come in somewhere in the 200-250 range). I like it when I can predict the "difficulty" of my challenges.

Do other people do that? Or am I an outlier?

caird coinheringaahing

8:18 PM

I try, but usually drastically over-estimate for both golfing langs and non golfing languages

AdmBorkBork

Also, @DJMcMayhem, 80 vs 98 :p

DJMcMayhem

I know, I know

:P

caird coinheringaahing

Socratic?

AdmBorkBork

Yep

caird coinheringaahing

RIP, I haven't even got Curious

New Main Posts

8:31 PM

0

Q: What are these letters?

So what might be the shortest language for this simple task? Task: You are given an input of type String - the string is a valid hexadecimal number ([0-9A-F]). Convert it to a decimal number and print it to the console. Tests: HEX -> DEC 1 -> 1 98 -> 152 539 -> 1337 1337 -> 4919 F -> 15 Wi...

code-golf base-conversion

Lynn

8:45 PM

I just saved a byte in a really cute way in a Python solution: if n is a positive int, then len(`n`)+1 can be len(`-n`)

DJMcMayhem

That's pretty cool

totallyhuman

9:10 PM

@NewMainPosts why string output pls very unnecessary

caird coinheringaahing

@NewMainPosts Oddly enough, taking input from stdin saved bytes in Jelly there :P

Adám

@cairdcoinheringaahing How? Isn't stdin always an option per standard I/O rules?

totallyhuman

@Adám Yeah, but it's not always golfier for Jelly.

caird coinheringaahing

@Adám The challenge originally forced input via stdin. When it got allowed to take CLA, I tried to rewrite it, but it was longer

totallyhuman

In fact, it's usually the opposite.

Conor O'Brien

9:20 PM

No, it's also an interesting experiment: How many downvotes can you get for a correct answer? — trojanfoe Aug 19 '11 at 7:57

ASCII-only

@DJMcMayhem obviously we're not the super programmers because of our bad code style :P

totallyhuman

@ConorO'Brien It is code-only though, so at least some of the downvotes had a valid reason.

moonheart08

@Dennis what do you use to sandbox TIO?

totallyhuman

talk.tryitonline.net might be a better place to get Dennis's attention.

moonheart08

mk

quartata

9:29 PM

@moonheart08 SELinux

moonheart08

ah

caird coinheringaahing

TFW you give a blanket to your shivering dog, then immediately start shivering ಠ_ಠ

Erik the Outgolfer

9:57 PM

hey, look at who it is!

DJMcMayhem

10:40 PM

@EriktheOutgolfer :O

Woah

Pavel

@EriktheOutgolfer Who?

Erik the Outgolfer

dmckee, one of our pro-tem mods, who has left the site for a very long time

Magic Octopus Urn

He's right too, using that approach I can cut 25 12 bytes.

New Sandboxed Posts

10:58 PM

0

A: Sandbox for Proposed Challenges

File Permissions code-golf Adapted from the UIL - Computer Science Programming free response question "Carla" for 2018 District. Introduction In UNIX-like operating systems, each file, directory, or link is "owned" by a "user", who is a member of a "group", and has certain "permissions" ...