The Nineteenth Byte

DJMcMayhem

18:02

@Adám Just add them I guess

New Main Posts

1

Q: Is it a Harshad Number?

A Harshad number is a number that is divisible by the sum of its digits. This is obviously dependent on what base the integer is written in. Base 10 Harshad numbers are sequence A005349 in the OEIS. Your Task: Write a program or function that determines whether a given integer is a Harshad ...

Adám

@DJMcMayhem How?

Zacharý

Why 16 --- because you're a goner. (G-16 in base representation)

Adám

@DJMcMayhem 10848 LOC APL (counting only .dyalog;.css;.txt;.mipage)

Phoenix

18:23

HyperNeutrino

lol

Zacharý

HERESY! THAT ISN'T XKCD!

8

HyperNeutrino

what should the function to set the current grid space to a certain character do if it's at the end of the file

Peter Taylor

Format the hard drive. That's standard practice for undefined behaviour, right?

4

HyperNeutrino

lol

Okx

18:30

@Zacharý heresyliesslander.surge.sh

Zacharý

@Okx Nope. Not goin' there.

Okx

i spent ages making it ;-;

Adám

@Okx Why JS?

totallyhuman

wait

i inspired that didn't i

Okx

why not

Adám

18:33

@Okx CSS is enough.

Okx

it's not TC

Adám

@Okx Yes it is. (if hand-cranking is ok)

Okx

not quite

almost

totallyhuman

May 23 at 11:15, by Mayube

lies, slander, heresy

Zacharý

Stop arguing. JSSS was suprerior.

totallyhuman

18:34

but tis not quite .com is it

Adám

@Zacharý So what?

Zacharý

JS + CSS basically.

And my main point: stop arguing.

tuskiomi

Anyone else getting tired of the Is it a ___ number golfs?

5

Riker

^

totallyhuman

dennis got out-golfed by xnor

:o

Riker

18:37

link?

HyperNeutrino

@tuskiomi some of them are interesting

Riker

@totallyhuman and it's not that surprising

dennis is good, but so is xnor

totallyhuman

yeah but the meme D:

Riker

>_>

tuskiomi

The monotony of comparing against a formula is very offputting. and it seems like there's a number type of the day thing going around. we could have one challenge for every OEIS.

totallyhuman

18:37

also i need to implement a to base function

Mr. Xcoder

One does not simply outgolf Dennis.

totallyhuman

anyone got a good way to convert n to base k in python?

Riker

@Phoenix is that a tiny rick

I think that's a tiny rick

Mr. Xcoder

I do

totallyhuman

and i might be able to tie jelly

Phoenix

18:39

@Riker So do I

HyperNeutrino

hey I made a Hello World program in Paintbrush

sH>se>sl>sl>so>s,>s >sW>so>sr>sl>sd>s!

totallyhuman

jelly code page?

HyperNeutrino

yes

as you can see I am uncreative

anyfix used that codepage too lol

totallyhuman

!google python convert integer to base

ugh i keep forgetting

Phoenix

@totallyhuman From SO:

def numberToBase(n, b):
    if n == 0:
        return [0]
    digits = []
    while n:
        digits.append(int(n % b))
        n /= b
    return digits[::-1]

HyperNeutrino

18:40

oo you use duckduckgo?

totallyhuman

no

Peter Taylor

@tuskiomi There's nothing wrong when they're an interesting property, but I wish people would skip posting ones which are just about base conversion, primality testing, or linear recurrences.

HyperNeutrino

o :(

totallyhuman

i frequent another chat room that has a bot

that responds to a message starting with !google <term> with google.com/search?q=<term>

@HyperNeutrino look man i actually wanna find stuff when i search

caird coinheringaahing

@tuskiomi CMC: Check whether a number is a number

tuskiomi

18:42

@PeterTaylor I suppose the nominal option is to downvote the monotonous ones. That's not much of a help, though.

Adám

@totallyhuman I really think we should have a TIO bot here.

tuskiomi

@cairdcoinheringaahing :-)

Adám

@cairdcoinheringaahing Huh, like all the chars are digits, or even 123.456E789?

HyperNeutrino

@totallyhuman :(

Mr. Xcoder

@totallyhuman You can use format(n, 'x') for hexadecimal, format(n,'d') for decimal, with 'b'` for binary and 'o' for octal

totallyhuman

18:43

i want one for all bases

@Phoenix oh thanks

Mr. Xcoder

No, sorry

caird coinheringaahing

@Adám just check if its a number

Phoenix

@totallyhuman Although, here's a faster version:

import string
digs = string.digits + string.letters


def int2base(x, base):
    if x < 0:
        sign = -1
    elif x == 0:
        return digs[0]
    else:
        sign = 1

    x *= sign
    digits = []

    while x:
        digits.append(digs[x % base])
        x /= base

    if sign < 0:
        digits.append('-')

    digits.reverse()

    return ''.join(digits)

Leaky Nun

@cairdcoinheringaahing Python: lambda n:1 (because a number must be a number)

caird coinheringaahing

5 => true, a => false, 10a => true

Phoenix

18:43

Apparantly

Uriel

@cairdcoinheringaahing APL: 1

musicman523

@LeakyNun How does that work with duck typing? I thought the input was given as a string

totallyhuman

wait any reason to return a list instead of the sum of it

HyperNeutrino

@LeakyNun lol

Leaky Nun

@musicman523 a number must be a number

totallyhuman

18:44

^

caird coinheringaahing

@LeakyNun print(1) -3 bytes

Leaky Nun

@musicman523 it just returns 1 for everything

Phoenix

@totallyhuman Yeah, I think it isn't a very well written function.

musicman523

@LeakyNun Not all strings are numbers, unfortunately

HyperNeutrino

@musicman523 but the question is "check if a number is a number"

Leaky Nun

18:44

@musicman523 read the CMC again

HyperNeutrino

> if a number is a number

Mr. Xcoder

@totallyhuman probably would be shorter with numpy: numpy.base_repr()

Adám

@cairdcoinheringaahing APL: ⍬≡0∘⍴

Leaky Nun

2 mins ago, by caird coinheringaahing

@tuskiomi CMC: Check whether a number is a number

musicman523

Well that's just silly

caird coinheringaahing

18:45

@musicman523 thats the point

musicman523

I still have a shorter answer though

Python, 3 bytes: int

tuskiomi

Leaky Nun

@musicman523 doesn't work for 0.1

caird coinheringaahing

@musicman523 Python REPL: 1

musicman523

float then

Phoenix

18:46

@totallyhuman import gmpy2;gmpy2.digits(n, base) works.

Mr. Xcoder

You abuse the meta consensus with error throwing

Erik the Outgolfer

@LeakyNun heh

Leaky Nun

@musicman523 doesn't work for 1+2i

Peter Taylor

@tuskiomi Tell me about it. I've been downloading boring bandwagon-hopping questions for years, and they haven't gone away.

musicman523

@LeakyNun that's not a number in MY domain :P

Catija

18:47

Please remember that if you find something inappropriate and would like to have it removed, you may be better served by using the "flag for moderator attention" and including an explanation for why you found it inappropriate. It's a pretty safe bet that a chat message with 6 stars is unlikely to be deleted unless it's overtly problematic. Thanks!

caird coinheringaahing

@PeterTaylor if you insist on downloading them, they can be difficult to remove

HyperNeutrino

@LeakyNun first of all it's 1+2j

musicman523

complex then :P

tuskiomi

I should create an adblock fliter that filterse these questions out! :P

Zacharý

@musicman523 Sort of is ... (MY - the programming language :p)

Leaky Nun

18:47

@HyperNeutrino is 1+2i a number?

HyperNeutrino

@LeakyNun yes

Leaky Nun

@HyperNeutrino exactly

Erik the Outgolfer

@Catija what happened?

HyperNeutrino

it's a complex number which I think is a number lol

musicman523

@HyperNeutrino you're a complex number

HyperNeutrino

18:48

@musicman523 r00d :(

caird coinheringaahing

@musicman523 Welcome to primary school!

tuskiomi

Haha!

totallyhuman

@Phoenix uhm what's gmpy2?

Downgoat

@musicman523 oshit sick burn

Mr. Xcoder

@Catija Wrong chat room?

Catija

18:48

@EriktheOutgolfer Someone used a generic spam/offensive flag on a message in here.

@Mr.Xcoder Definitely not.

Erik the Outgolfer

but I didn't see any blue

HyperNeutrino

oh right 10k+ can all see flags

Catija

@EriktheOutgolfer It was a few minutes ago.

Downgoat

@Catija Popcorn SE says nothing?

Erik the Outgolfer

oh

HyperNeutrino

18:49

was wondering why erik could see flag

Riker

@EriktheOutgolfer yep it happened

totallyhuman

i'm not adding some random dependency >_>

Mr. Xcoder

@HyperNeutrino How is the new language going

HyperNeutrino

@Mr.Xcoder eh haven't worked on it in a whole 5 minutes

wait is it 10k on highest, 10k on parent, or 10k network to see flags?

Mr. Xcoder

Wow

Zacharý

18:50

@HyperNeutrino, were you the one with the whole page for languages?

HyperNeutrino

@Zacharý which page?

caird coinheringaahing

@Zacharý thats me

Mr. Xcoder

@HyperNeutrino on parent I think

Zacharý

@cairdcoinheringaahing Thanks.

HyperNeutrino

ah ok

Downgoat

18:51

@HyperNeutrino network

Mr. Xcoder

Yep, sorry

HyperNeutrino

oh hm.

then I could theoretically join 20 sites and use assoc bonus to get to 10k pretty quickly

don't see a point in that though :P

caird coinheringaahing

@HyperNeutrino you just found the flaw in your plan

HyperNeutrino

what

Mr. Xcoder

But network rep only includes sites you're over 200

I though

HyperNeutrino

18:52

ah ok

totallyhuman

wait i have a better idea for base conversion

use jelly's function

caird coinheringaahing

@Zacharý this?

totallyhuman

lol

HyperNeutrino

@totallyhuman yes +1

Zacharý

Yeah, that.

caird coinheringaahing

18:53

@totallyhuman you can't write an interpreter for your new language in Jelly!

Zacharý

@cairdcoinheringaahing It's possible, just don't do it.

totallyhuman

no but i can take inspiration from the jelly code (which is written in python)

Phoenix

@totallyhuman The first reference to it is a link

HyperNeutrino

or use the SO post that Phoenix gave you

caird coinheringaahing

@Zacharý until you write a brainfuck one in Jelly, at least

totallyhuman

18:54

but that would return a string

Phoenix

gmpy2 is written in C, so it's significantly faster.

totallyhuman

and i need to be able to do integer operations on it

caird coinheringaahing

@totallyhuman Python, 3 bytes: int

totallyhuman

def to_base(integer, base, bijective = False):
	if integer == 0:
		return [0] * (not bijective)
	if bijective:
		base = abs(base)
	if base == 0:
		return [integer]
	if base == -1:
		digits = [1, 0] * abs(integer)
		return digits[:-1] if integer > 0 else digits
	sign = -1 if integer < 0 and base > 0 else 1
	integer *= sign
	if base == 1:
		return [sign] * integer
	digits = []
	while integer:
		integer -= bijective
		integer, digit = divmod(integer, base)
		digit += bijective
		if digit < 0:
			integer += 1

@cairdcoinheringaahing it has other characters :P

ok so jelly's version is slightly complicated...

HyperNeutrino

CMC: Make a BF interpreter

caird coinheringaahing

18:56

I will offer 4x500 rep bounties to the first person who makes a Jelly interpreter in brainfuck

Phoenix

@totallyhuman Just add a gmpy2 dependency.

HyperNeutrino

@cairdcoinheringaahing i wonder if that's even possible lol (i mean of course it theoretically is)

caird coinheringaahing

@HyperNeutrino codegolf.stackexchange.com/questions/84/interpret-brainf

tuskiomi

@HyperNeutrino a Blue Flower interpreter?

HyperNeutrino

?

Mr. Xcoder

18:57

@HyperNeutrino Since it is Turing Complete, anything is possible... Remember we have Dennis around!

caird coinheringaahing

@HyperNeutrino CMC answer: this

HyperNeutrino

@Mr.Xcoder lol true

New Main Posts

0

Q: Is it a ___ number?

Background Inspired by this chat message, a "___ number" is any word used to solve a crossword clue containing the phrase "___ number" according to this crossword solver as of the posting of this challenge. The words are: opus, atomic, any, inat, picka, were, potion, dida, doesa, aleph, octa...

code-golf string

HyperNeutrino

oh yeah speaking of which I wonder if MD XF is ever going to become active sometime in the future

but yay

caird coinheringaahing

@HyperNeutrino like Howard?

totallyhuman

18:59

alright fine i'll add a numpy dependency

HyperNeutrino

oh hm interesting

musicman523

My BF interpreter - you just have to make the lenguage program that it wants and then execute that

totallyhuman

might use numpy for other stuff anyways

HyperNeutrino

like Alex? xD

also use sympy

Mr. Xcoder

@musicman523 Sorry, that challenge is awful 😕

caird coinheringaahing

19:00

I think Alex A. has gone AWOL

HyperNeutrino

@cairdcoinheringaahing reading that is awkward because I'm also Alex lol

totallyhuman

@HyperNeutrino does sympy have base conversion?

caird coinheringaahing

@HyperNeutrino coughs

HyperNeutrino

@totallyhuman I don't think so

just use it because then no fp error

@cairdcoinheringaahing ?

rip the challenge

caird coinheringaahing

(tell no-one but glances I edited the message!)

HyperNeutrino

19:02

oh

I didn't notice

lol

Mr. Xcoder

Thanks for removing it!

caird coinheringaahing

@Mr.Xcoder savage

@totallyhuman try this in Jelly

plus no existing answer so no cheats!

totallyhuman

i don't know how to do anything in jelly yet

:P

Mr. Xcoder

Nor do I

caird coinheringaahing

I just write it in Python and use ŒV

2

Erik the Outgolfer

19:05

@totallyhuman then you should train jelly...that is if you have any free time

Mr. Xcoder

I think learning both Pyth and Jelly at the same time is not benefficial

caird coinheringaahing

@EriktheOutgolfer stop advertising SE on SE!

Erik the Outgolfer

huh?

totallyhuman

@cairdcoinheringaahing that's... not how any of this works

Erik the Outgolfer

is that an unsolicited advertisement or something?

caird coinheringaahing

19:06

I really need to stop making jokes that only I understand...

Did I kill the room?

Mr. Xcoder

"Free time" and SE are antonyms

8

totallyhuman

> Silence is okay.

caird coinheringaahing

@totallyhuman yeah but it just feels wrong after you don't say something like bye

Mr. Xcoder

Bye

Gtg

And Sya

caird coinheringaahing

@Mr.Xcoder bye!

Mr. Xcoder

19:09

Are the most frequent messages on SE

totallyhuman

bye

Mr. Xcoder

I don't leave @cairdcoinheringaahing

Don't kill it!

caird coinheringaahing

@Mr.Xcoder <.> you lied to me!

HyperNeutrino

new meta post coming soon

Erik the Outgolfer

huh?

HyperNeutrino

19:09

*sandbox

Mr. Xcoder

@HyperNeutrino SB?

HyperNeutrino

@Mr.Xcoder ninja'd

but yes

Mr. Xcoder

Ah ninja'd!

HyperNeutrino

and I meant new SB post by feeds

Erik the Outgolfer

@Mr.Xcoder ^^^^^

caird coinheringaahing

19:10

@EriktheOutgolfer is that your most common message?

HyperNeutrino

it's already posted

Mr. Xcoder

Ninja'd again

caird coinheringaahing

Stop it!

Mr. Xcoder

Ok

totallyhuman

uhm

no "Stop it!" is not starworthy

dear lord

HyperNeutrino

19:10

don't mention it...

caird coinheringaahing

@totallyhuman star spammer on the loose

Erik the Outgolfer

OH NO STAR ABUSE AGAIN

HyperNeutrino

Jul 1 at 18:13, by Mego

Repeatedly starring and unstarring things is still star spam. Cut it out.

It doesn't matter that it's not starred anymore.

Poke

You know I bet whoever is starring those things can see the starboard

and doesn't care

HyperNeutrino

mhm

Poke

19:11

so reposting that

HyperNeutrino

63

Q: Provide a way to determine which user is spamming stars in chat

As a compliment or alternative* to not refunding cancelled stars, it'd be nice if chat would auto-raise a flag identifying someone starring n items in x minutes, or at least provide a list of unusually active starrers that could be consulted when there was a problem. While star-spam is fairly lo...

feature-request chat moderator-tools abuse chat-stars

Poke

isn't actually doing anything

Zacharý

Please: whoever is doing that stop it.

caird coinheringaahing

Just stop

Mr. Xcoder

Stop!

totallyhuman

19:12

guys

Erik the Outgolfer

Mego is right about repeated starring and unstarring. Please respect that.

4

totallyhuman

just stop bringing attention to it

HyperNeutrino

telling people to stop 3 times in a row won't change anything...

totallyhuman

^

caird coinheringaahing

I reckon its actually Mego, pretending to be someone else

HyperNeutrino

19:12

@cairdcoinheringaahing What now?

Poke

can we move the last page of messages to the trash

Erik the Outgolfer

don't underestimate penguins

7

caird coinheringaahing

Mego is doing all the starring

Mr. Xcoder

@Poke Good idea

HyperNeutrino

uhm no.

totallyhuman

19:13

oh no now erik's message is gonna be on the starboard

HyperNeutrino

I highly doubt that.

Zacharý

@cairdcoinheringaahing Who is he staring at?

Erik the Outgolfer

@cairdcoinheringaahing he isn't 100%

HyperNeutrino

Besides please don't say that anyway.

totallyhuman

do you people realize that you're feeding the trolls

Erik the Outgolfer

19:13

he's not even in here rn

Mr. Xcoder

Let's boycott TNB for the next ~3 seconds

HyperNeutrino

> pretending to be someone else

Erik the Outgolfer

PLEASE STOP THAT SOMETIME

Mr. Xcoder

?

Phoenix

Hah, teamspirit.js is reporting a score of 20/0

HyperNeutrino

19:14

I'm going to go try to wait out the spam.

totallyhuman

><

Erik the Outgolfer

suggestion: don't talk! the spammer will be fed up and stop

caird coinheringaahing

I'm going to Jelly Hypertraining for some peace and quiet!

totallyhuman

just stop talking about it

jeez

Mr. Xcoder

Let's change it: what is the shortest way to get the divisors of a number in Pyth?

Phoenix

19:15

The problem is that few people know Pyth

Leaky Nun

@Mr.Xcoder I solved a problem about divisors without explicitly finding the divisors

Mr. Xcoder

Few? I highly doubt that!

@LeakyNun The task is to get the divisors

Leaky Nun

3

A: Product of Divisors

Pyth, 6 bytes *Fs{yP Test suite.

here, for your reference

Mr. Xcoder

No, a list of divisors is needed

(Self-challenge)

caird coinheringaahing

@Mr.Xcoder just remove the P

Erik the Outgolfer

19:17

@cairdcoinheringaahing huh?

it's not jelly

Leaky Nun

@cairdcoinheringaahing no, that isn't how it works

caird coinheringaahing

just a guess

Leaky Nun

*F is the product

1 min ago, by Leaky Nun

@Mr.Xcoder I solved a problem about divisors without explicitly finding the divisors

I did say without explicitly finding the divisors

Mr. Xcoder

K, fine

HyperNeutrino

question: does sympy support complex numbers?

Leaky Nun

19:19

@Mr.Xcoder 6 bytes: f!%QTS

Zacharý

@HyperNeutrino Yes

HyperNeutrino

oo yay

Zacharý

Python supports complex numbers by itself, like 1+2j

HyperNeutrino

but does sympy have a representation of them

like there's sympy.Rational

and sympy.Integer, and sympy.Zero and sympy.One for example

Leaky Nun

@Mr.Xcoder 5 bytes: *M{yP

the M here is different, mind you

Phoenix

19:20

Guys

Just use Mathematica

Business Cat

Just use Assembly

Erik the Outgolfer

not sure how using mathematica is in pyth...

Zacharý

sympy.core.numbers.ImaginaryUnitis what sympy uses.

HyperNeutrino

oh ok

so how would I use that

or actually nah ascii-art programs aren't going to need those

they'd be too much of a pain to use anyway

I don't think using sympy is even necessary for an ascii-art lang

Zacharý

Why did you think it was?

HyperNeutrino

19:23

I didn't want fp errors

musicman523

Just write a language that implicitly uses rationals as the number system, then write the ascii-art language in that language

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Is it a ____ number? code-golf number Inspired by this chat message, this is a challenge about determining if a number is a ___ number for some specification. Challenge Given the ID to an open PPCG question about "Is it a ___ number?" and a number, your program should determine whether or not ...

Zacharý

@musicman523 So... basically Ruby except you redefine / to give you rationals?

Phoenix

@totallyhuman tio.run/##K6gsycjPM/7/…

musicman523

@Zacharý Does Ruby use rationals by default? I don't know Ruby

Phoenix

19:34

Goes up to base 62, does not support unary.

Zacharý

@musicman523 I did say except. Ruby doesn't use rationals by default though.

musicman523

Why Ruby then?

Mr. Xcoder

@LeakyNun Vielen Dank

Leaky Nun

@Mr.Xcoder kein Problem

musicman523

Ah

Zacharý

19:36

I seem to remember that working for some reason.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

ASCII reflections in a box You probably all know the Law of Reflection, in this challenge you'll visualize the trajectory of a ball in a box. Task You're given three integer pairs W,H, x,y and dx,dy - the first represents the size of the box, the second the starting position and the third pair...

Zacharý

Here: repl.it/JXTv

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