The Nineteenth Byte

1. because at the time I posted I did n't know about TIO
2. because TIO has no directories below the current one
3. Yes the site I used now is not in a good state for testing — at least I don't know if I can pass program arguments!

user202729

Try it online!

/opt exceed 128 KB limit.

sergiol

thanks @user202729

Pavel

@sergiol So run mkdir a couple times: tio.run/…

Poke

curl http://parrot.live you're welcome

Pavel

@Poke Blocked here, what was supposed to happen?

user202729

2:33 PM

@sergiol 272 bytes by reusing a.

Poke

@Pavel party parrot, my dude

user202729

269 bytes by using var. Java will have this soon.

248 bytes by using something I can find on StackOverflow.

246 bytes by default inititialize n.

244 bytes by reducing number of times n is pinged.

Soaku

Uhh... I'm making a scraper for a website that doesn't like bots. It checks if the bot requests it too often and possibly ban the bot for a very short amount of time (~0.1 second). Somehow, my Python bot has problems with it. When it sees the warning "you are requesting too fast", it's waiting 5-10 seconds and then continues. Somehow, it keeps getting the warning, even when it works slow. When I login to the page with the same account as the bot does, I have no problems, no warning showing.

The page uses user's database record to check the last request, not by IP or session ID. Any ideas? :/

sergiol

@user202729: I can default init n, but not i :(

user202729

230 bytes using EAFP.

@sergiol I removed i from the code at the "248 bytes" change.

(StackOverflow post)

Pavel

2:50 PM

@user202729 Java has var now.

Poke

@Soaku reminder to be careful that you're not going against the TOS for that website. The website might be taking your user agent into consideration

Pavel

CMC: Output the first n strings of the following sequence:

>
<
->
<-
-->
<--
--->
<---
...

moonheart08

@dzaima both arrows are not on the same end

dzaima

@Pavel SOGL, 16 bytes

@moonheart08 yep, still angry that I made ↔ mirror strings bot not reverse them...

moonheart08

lol

totallyhuman

3:02 PM

haskell: (`take`concat[['-'<$[1..i]++">",'<':'-'<$[1..i]]]|i<-[0..]])

untested :P

moonheart08

i would make a golfscript-# joke, but it's rather boring

user202729

@sergiol 222 bytes using a tip for golfing in C#.

totallyhuman

nope doesn't work

*sighs*

dzaima

@Pavel Canvas, 13 bytes

totallyhuman

Haskell, 56 bytes: (`take`concat[[j++">",'<':j]|i<-[0..],j<-['-'<$[1..i]]])

Pavel

3:08 PM

@totallyhuman Your markdown appears to have borked

totallyhuman

indeedy ;-;

user202729

You can't have spaces right after the opening `.

(deleted)

totallyhuman

there you go

user202729

Do we allow challenges that is originally posted on another site? (this sandbox challenge)

moonheart08

I'm trying to figure out behavior for subtraction, multiplication, and division of an array that's not just a matrix operation. (Addition is append)
What do you guys recommend?

user202729

3:21 PM

@moonheart08 Don't. Use explicit method names.

moonheart08

Even for a golfing language?

(Forgot to state i'm doing another golfing language, because i like reinventing the wheel endlessly)

user202729

CMP: In Python, do you prefer list(map(Point,zip(xcoord,ycoord))) or [Point(x,y)for x,y in zip(xcoord,ycoord)]?

@moonheart08 Vectorizes?

moonheart08

Sure.

Pavel

@user202729 The latter, I don't use constructors like other functions.

DJMcMayhem

@user202729 The latter

Although even better is [Point(x, y) for x, y in zip(xcoord, ycoord)]

Spaces are important

user202729

3:33 PM

@DJMcMayhem In my opinion, (somewhat influenced by ngn) only spaces that help separating the code logic are important.

DJMcMayhem

You could also totally do [Point(*coords) for coords in zip(xcoord, ycoord)]

user202729

I often don't include spaces after ,.

DJMcMayhem

@user202729 blech

python.org/dev/peps/pep-0008 all day every day

user202729

Basically I don't do what "IDE/Code format" can do.

class P:
	def __init__(self,x,y):
		self.x=x;self.y=y
	def __add__(a,b):return P(a.x+b.x,a.y+b.y)
	def __sub__(a,b):return P(a.x-b.x,a.y-b.y)
	def __mul__(a,b):return P(a.x*b,a.y*b)
	def dot(a,b):return a.x*b.x+a.y*b.y
	def cross(a,b):return a.x*b.y-a.y*b.x

^ is that too few spaces? Probably.

DJMcMayhem

My eyes are bleeding

class P:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __add__(a, b):
        return P(a.x + b.x, a.y + b.y)

    def __sub__(a, b):
        return P(a.x - b.x, a.y - b.y)

    def __mul__(a, b):
        return P(a.x * b, a.y * b)

    def dot(a, b):
        return (a.x * b.x) + (a.y * b.y)

    def cross(a, b):
        return (a.x * b.y) - (a.y * b.x)

NieDzejkob

3:38 PM

P*n works but n*P doesn't. is that intended?

user202729

@NieDzejkob Work in what?

Uh... no.

NieDzejkob

in @DJMcMayhem's code?

DJMcMayhem

That's not mine, it's @user202729 but with PEP8 formatting

user202729

Actually my code, DJ reformatted it (or just run it through an autoformatter)

DJMcMayhem

No, I did that by hand

NieDzejkob

3:39 PM

yeah, your code. Didn't follow the conversation for a moment...

user202729

Anyway... I can't remember to implement everything. If something breaks I will fix it.

DJMcMayhem

@user202729 I haven't done operator overloading before. Is that correct without a self?

user202729

@DJMcMayhem Python always require self. Class.methodname(self,*args) == self.methodname(*args).

Same for operator overloading. a+b == a.__add__(b) == P.__add__(a, b).

DJMcMayhem

Makes sense

Cows quack

Lean theorem prover

NieDzejkob

3:47 PM

@Cowsquack the inbrowser version doesn't seem to work for me

Cows quack

I don't think the example was supposed to give output

Riker

@flawr 10/10

I also love how some posts there are just tagged 'russia'

lol

user202729

Anyone know of a onlne plotting tool (for example I give input

(23,30)
(10,45)
(8,47)
(-2,38)
(-11,27)
(-13,13)
(-8,3)
(0,0)
(5,5)
(18,22)

and it draws the points)

(except Wolfram|Alpha)

Cows quack

desmos? (but it takes input in another format)

user202729

Input format is not important.

totallyhuman

3:55 PM

@user202729 you could also remove zip

Riker

desmos should work

user202729

@totallyhuman ... I forgot it ...

sergiol

@user202729 I tried to do exactly that before asking here!

@user202729 I am using your golfing suggestions and editing my answer one step each time because I want to know what is going on behind the scenes

@user202729: I used a different order of steps

New Main Posts

0

Q: Facey McFaceface

Anyone remember Boaty? You could totally make any old word, right? Write a function to turn a string into Somethingy McSomethingface. It should accept one string as input. Ignore the case of the input. If the word ends in 'y', your function should not add an additional 'y' to the first instanc...

code-golf

sergiol

4:15 PM

@user202729 Thanks very much, I understood all the changes you made :)

Soaku

@Poke Well, this is against the TOS, but I got permission from administrator. And I've set the client already, forgot to mention.

Thomas Ward

now I'm curious which TOS you're breaking lol

user202729

How can I set the locale (for Jelly)?

TIO for failed attempts

Do I need export?

(I still didn't fully understand how Linux works...)

Pavel

4:35 PM

@user202729 If you don't export, only the current process will "see" the variables, ones you create won't.

user202729

Anyway I found a workaround.

NieDzejkob

@user202729 variables in shell scripts start with the values of the "environment" of the parent process. You can use export to update the version of the environment which will get passed to programs you run

El'endia Starman

Unrelated, but curl parrot.live for a fun time.

user202729

@El'endiaStarman Dupe of previous message.

El'endia Starman

@user202729 Would've been nice if you had linked to it.

2 hours ago, by Poke

curl http://parrot.live you're welcome

Am I expected to search chat history every time I want to say/post something that might've been shared before?

user202729

4:44 PM

Feb 26 at 16:29, by Mr. Xcoder

Hey I don't search in TNB to see if someone posted the same meme before ¯\_(ツ)_/¯

Riker

that's.... agreeing with el'endia

>_>

anyway nice to see you again @El'endiaStarman been a while

how's c.se going?

user202729

@Riker c.se?

Riker

christianity.se, his mod site

user202729

Christianity

Riker

I typoed christianity like 5 times so I gave up

El'endia Starman

4:45 PM

@Riker Sure has been a while. Anything new/exciting happen in TNB over the last few months?

Riker

@El'endiaStarman not really

I presume you saw the mod election?

(since that gives a little notice bar beep)

El'endia Starman

Yeah, voted in it.

user202729

Is there a way to let Jelly take input from file instead of command-line argument without changing the source code itself (only the interpreter)? Because this fails.

El'endia Starman

IIRC the results matched my votes, so yay, but I would've been happy with any result considering the candidates.

Riker

yeah, not much else going on in TNB / main since then

@El'endiaStarman lol

El'endia Starman

4:47 PM

C.SE has been active but fairly quiet, which is nice.

NieDzejkob

@El'endiaStarman C.SE?

Riker

2 mins ago, by Riker

christianity.se, his mod site

@El'endiaStarman only other thing that happened was the best of ppcg 2017, that's viewable on meta

user202729

And when you type ppcg.se everyone understand... (hopefully)

El'endia Starman

@Riker Ah yes. I didn't really have time/motivation to look at all the links, unfortunately. Work has been keeping me decently busy.

Riker

actually not turns out

they don't get "codegolf" from "ppcg"

user202729

4:55 PM

@Riker google.com/search?q=ppcg ...

(or is that customized just for me?)

El'endia Starman

Google results typically are customized to some extent to try and show you more relevant results. PPCG.SE is second in the results I got.

Riker

@user202729 >implying people immediatley use google when they don't know something

Soaku

Google most often changes the results so they fit the location and language. I get "PPCG stock"... Wish Google understood that I want English results, not in Polish, but it won't understand...

NieDzejkob

@Soaku DuckDuckGo has a switch in the top left for that. Does Google do too?

Soaku

@NieDzejkob Sadly, Google has an option for changing the language, but of the site, not the results

There is one in settings, but it doesn't do what it should - it only hides the "Search only in Polish" message when searching in English

flawr

5:55 PM

@betseg @Riker /r/SeeYaLaterLosers/ 11/10

Riker

5/7

2

Lembik

hi all

coding question.... say you have an array of n positive integers and you want to put them into b buckets

Each bucket covers some range of the indices of the original array of size n/b. Each bucket should just contain a single number which is the sum of the integers in the bucket

is it easy to do that in linear time?

it is making my head hurt

I feel it should be easy

flawr

can you give us an example?

Lembik

6:11 PM

here is a really simple one

(1,0,5,1) into two buckets would be (1,6)

if n/b is not an integer then we will need to round suitably

Cows quack

could it also be (2, 5)?

Lembik

@Cowsquack no.. how would you get that?

the array is in order

think of it as 1 egg sold on day 1, zero on day 2, 5 on day 3 etc.

flawr

make a new array with b entries

Cows quack

oh, the order matters, I thought "bucket covers some range" meant that they cover an arbitrary range

flawr

set a counter c=0

Lembik

6:13 PM

@Cowsquack ah right.. I wasn't very clear sorry

flawr

loop over all entries: increase the conter at each entry, and check every time whether c> n/b. If yes, reset c=0 and use the next bucket

Lembik

sounds simple now you put it that way :)

Luis Mendo

Or use Matlab's accumarray :-P

Lembik

oh do any free languages have it built in?

I am happy to use anything pythoney

Luis Mendo

Octave, yes

flawr

6:14 PM

yes, Octave

Luis Mendo

Probably numpy too

Lembik

docs.scipy.org/doc/numpy/reference/generated/… ?

Luis Mendo

Apparently yes

Lembik

hmm.. let me see if I can get that to work.. 2 secs

flawr

@Lembik alternatively split your array into b chunks of equal size and sum each of them

Lembik

6:16 PM

@LuisMendo I am not sure bincount does

unless I have misunderstood how to use it

@flawr ah yes I suppose that can be linear time too

flawr

@LuisMendo I always wondered why there is not repmat that just pads/cuts off the array if the size you specify doesn't match

Lembik

does accumarray allow you to specify the number of buckets?

flawr

I think accumarray is more general

Lembik

ok I can't actually see how to use docs.scipy.org/doc/numpy/reference/generated/… to do this

it seems to do something completely different

that is count how many times each number occurs in the list

flawr

the actual array goes into weights

Riker

6:22 PM

<reads backscroll> wait, @flawr so convolution isn't the answer to everything? :p

flawr

you need to compute a second array that contains labels that say in which bucket each entry goes

@Riker hoo sed dad?

you could actually solve this using convolution

in matlab this would be something like x = conv(array, ones(1,n/b)); answer = x(1:b:end)

Okx

I don't see Elixir being used at all in PPCG

Riker

May 15 '16 at 21:57, by flawr

@CᴏɴᴏʀO'Bʀɪᴇɴ I know, convolution can do anything

Pavel

@Okx Be the change you want to see in this world

Okx

I am. Posting quite a few Elixir answers

flawr

6:31 PM

@Riker here you go

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Electronic Piggy Bank A piggy bank is a container used to collect coins in. For this challenge use the four US coins: quarter, dime, nickel, and penny. Challenge Your challenge is to create an electronic piggy bank. Write a program (or function) that when run (or called), outputs (or returns) ...

Riker

@flawr I guess I don't really get much of a choice other than bowing to the might of convolution, hm?

:D

flawr

or you fft the shit out of it and bow to the might multiplication.

Riker

fft + multiplication = convolution confirmed

flawr

fft + convolution = multiplication confirmed

=> 2*fft = 0

and this implies 2 = 0

Lembik

6:38 PM

@flawr thanks

flawr

np!

math rocks

Pavel

Why is floating point so annoying (ノ°Д°）ノ︵ ┻━┻

I'm sticking to integers for everything from now on

flawr

why don't you go all the way and stick to natural numbers?

moonheart08

lol

flawr

nobody needs those fantasy "negative" numbers anyway

moonheart08

6:43 PM

Why even bother. You only need a '1' to represent a brainfuck program

No-one needs the fancy 2 through 9

just 1

Pavel

I just spent two hours fixing like five seperate major problems in a group project that were pretty much all caused by comparing floats for equality.

moonheart08

you only need 70818400575684102291859867004917893470532314351736139503167322734980393838011937‌859778003735372196763609736264517534703641721495914192366762928523336030601697875‌1166690464736541968556 ones to represent "Hello, World!"

~~totally didn't just look up unary and steal the number~~

flawr

@Pavel lool :D

some floats are more equal than others

moonheart08

@Pavel whatever floats your boat i guess.

mbomb007

This is why no one likes JavaScript. (Yes I know about ES6)

ETHproductions

6:55 PM

That's really unintuitive, even for JavaScript

Poke

@mbomb007 variable declaration hoisting?

flawr

@mbomb007 have you tried [100, 11, 1].sort()?

8

Poke

that's why i declare all of my js variables at the top

use strict doesn't let you use undeclared variables though

Pavel

> In JavaScript, hoisting is a powerful and an expressive feature

Hoisting is complete BS, is what it is.

Poke

it's how you can use a function that isn't defined yet

Pavel

7:02 PM

Yeah but it's still a horrible way of doing that

Poke

i mean if you run into a situation where you have a problem because of it

it's kinda your fault anyway

moonheart08

1D: A+A: Zip.
A+N: Zip with 0..n
A+M:
N+N:
N+M:
M+M:

I'm going to have a tough time filling in all of these possibilities (A is Array, M is Map, N is Number)
I'll just leave it for later

Seriously, just having 3 types gets convolted fast

Luis Mendo

7:18 PM

@flawr Heh, use MATL (assuming you mean reshape?)

flawr

@LuisMendo d'oh of course, reshape :)

Luis Mendo

@Lembik I've never used it, sorry

Lembik

np.reshape(L,(num_bins,-1)).sum(1) does it if num_bins divides len(L)

but not so useful otherwise

I am tempted to pose a challenge for this now :)

stop me if you think it's crazy please

totallyhuman

CMC: given a positive integer representing an xkcd comic, output whether its link has ever been starred in TNB

It's been five years. Can someone ungolf this for me so I can finally understand how it actually works? — J B Feb 17 '16 at 22:56

Riker

7:39 PM

foo, 1 byte: "1"

Lembik

challenge posted

Riker

returns 1 for true cases, anything else for false

@Lembik +1, looks good to me

do you have a reference code?

Lembik

@Riker me? No

@Riker thanks!

in principle it is trivial :)

I thought I would ask a code-golf question which might get a 2 byte answer :)

New Main Posts

2

Q: Put an array into bins

In this simple challenge you are given an input array L of non-negative integers and a number of bins b greater than 0 but no more than the length of L. Your code must return a new array M whose length is b and which has binned the array L. This easiest explained with examples. L = [1,0,5,1] and...

code-golf restricted-complexity

totallyhuman

@Riker the first one hasn't been starred

mbomb007

7:48 PM

@Poke But what if you don't want to declare every variable conditionally used in the function at the top of the function?

DJMcMayhem

@totallyhuman False :P

totallyhuman

:P

mbomb007

Then you have to deal with variables bleeding out of their intended scope, or use let.

Poke

@mbomb007 then you're not understanding javascript variable scopes

totallyhuman

still invalid anyways

some of them haven't even been linked

and if you try and fix that, you will get kicked :P

Poke

7:58 PM

challenge accepted?

:x?

mbomb007

8:17 PM

@Poke No. A sane person wants his variables declared as close to their usage as possible.

That's why they're called "local"

Poke

@mbomb007 that's not how javascript variable declaration works

you don't get "block scope"

you may as well define them at the top of the scope

because that's what's happening anyway

Riker

@betseg @flawr en.reddit.com/r/catpranks

flawr

@Riker already subbed:)

Riker

darnit

but it's glorious anyway

flawr

it is

@Riker img-9gag-fun.9cache.com/photo/aKj7Lqj_460sv.mp4

4

Riker

8:27 PM

oh noes where has cat gone

totallyhuman

*shwoomp*

mbomb007

8:45 PM

@Poke It has block scope if you use let. Scoping is a feature, and the only reason it didn't used to be available was because JS was created in 10 days.

Poke

@mbomb007 ok then just use let for everything

and stick use strict on all your files for good measure

or

declare everything at the top

those are the options you get

scope as a feature is pretty shitty, though, haha

For the record I was just giving you the javascript know-how. When I code with real programming languages I declare variables as close to their usage as possible as you mentioned.

Pavel

9:02 PM

@Poke I like the implication that JavaScript isn't a real language.

ASCII-only

9:33 PM

@Poke ... you don't need use strict

@mbomb007 because it's in a function?

@Pavel :|

mbomb007

@Poke Not allowed to.... :'(

@ETHproductions ~~eyes~~ moles

Nathan Merrill

is it possible for me to take a SE id and find their chat id?

I want to see if a particular user is in chat anywhere

ASCII-only

Mar 24 at 3:29, by quartata

@user202729 go to chat.stackexchange.com/accounts/<network profile id>

Nathan Merrill

oh, it's their network profile id

thanks :)

ASCII-only

@NathanMerrill not exactly

it redirects to chat profile

Poke

9:51 PM

@ASCII-only I didn't say you did but why not add it

ASCII-only

@Poke because a random string literal is really ugly

Poke

@ASCII-only I wouldn't call it random or a string literal

ASCII-only

@Poke well having a string literal at the top of your code is kinda weird

Poke

not in javascript

;)

idk if that changed in es6

ASCII-only

:|||||||||||| i guess

@TonHospel ~~:D finally found the short quine~~ hang on 19 bytes wat

is this supposed to happen

Magic Octopus Urn

10:21 PM

What's the shortest current Brain-flak quine?

Pavel

50

A: Golf you a quine for great good!

Brain-Flak, 9.8e580 1.3e562 9.3e516 12818 11024 4452 4332 4240 4200 4180 3852 3656 3616 3540 2485 + 3 = 2488 bytes Now fits in the observable universe! (())(()()())(())(())(()()())(())(())(()()())(())(()()()()())(()())(()()()()())(())(()()())(())(()()()()())(())(())(())(())(()()()()())(())(())(...

Magic Octopus Urn

@Pavel 9.8e580 I... You... what?

Pavel

Yes

Magic Octopus Urn

Interesting explanation though...

On another note, why are some people just called "User######"?

Pavel

@MagicOctopusUrn That's a default name, you don't have to pick one. In this case it just Wheat Wizard being annoying though.

3

ASCII-only

10:28 PM

:| did i break perl

i got a shorter perl 6 quine than current shortest too

Magic Octopus Urn

@Pavel Wait what? How is that user wheat wizard?

ASCII-only

@MagicOctopusUrn They just changed their name to test something

Mar 15 at 22:37, by user56656

I changed my name to test something. And now other people want me to change it back

Magic Octopus Urn

Wait... So my older posts will show my old username?

Destructible Lemon

well that answer has wheatwizards new name, not the one he had

Magic Octopus Urn

I... wait what?

@DestructibleLemon user56656 shows on that answer for me

Pavel

10:39 PM

Right

That's his current name

Magic Octopus Urn

LOL ohhh...

I was thinking this happened in the past for a second, had me confuzzled.

New Main Posts

11:04 PM

0

Q: Given a grid, starting at the center and spiraling out, and an Position what is the ID?

Related: Determine the position of a non-negative number in the infinite spiral Wind me a number snake! Challenge: Given a grid, with an ID starting at the center and spiraling out, what is the ID given a position in the fewest number of bytes? Grid: +---------------+---------------+------...

code-golf

Magic Octopus Urn

11:15 PM

CMC: Given a word (whose length is less than 10) output a unique number for each unique word, consistent between executions. No word may use the same number.

Wait... woah I'm in the top 100 for rep count?

Bubbler

11:46 PM

@MagicOctopusUrn is the word only alphabetic? uppercase or lowercase?

For only lowercase a-z: Python, 18 bytes

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