The Nineteenth Byte

12:00 AM

Like fourier, laplace and things like that?

Yep, exactly

Laplace atm

those happy little differential equations...

physicists literally only want one thing and it's fucking disgusting

Haha the problem you've just helped me solve was optimising a numerical integration algorithm for finding the volume of an n-dimensional sphere

I much prefer numerical solutions to analytical solutions now

@BetaDecay looks a lot like monte carlo stuff? :)

Haha exactly

12:07 AM

@BetaDecay both have their place, but analytical solutions are usually derived with very dirty tools:)

I wasn't sure how often mathematicians use numerical solutions haha

Guess it depends on the field really

sure

but just for exploring things you find people from all over the place using numerical methods

I need some sleep now, I hope we see you a little bit more again around here:)

A: Sandbox for Proposed Challenges

@flawr See you

1 hour later…

Nathan Merrill

1:11 AM

What does this mean (in Javascript/React):

{
isLoaded: true,
error
}

Does that automatically copy the properties of the error object into the object I'm creating?

Pavel

1:39 AM

@NathanMerrill Not quite, Try it online!

Nathan Merrill

2:19 AM

ah ok. So basically, it's shorthand for error:error

thanks

4 hours later…

New Sandboxed Posts

6:40 AM

Triangular domino tiling of an almost regular hexagon Background An almost regular hexagon is a hexagon where all of its internal angles are 120 degrees, and pairs of the opposite sides are parallel and have equal lengths (i.e. a zonogon). The following is an example of an almost regular he...

6 hours later…

12:32 PM

@betseg above mediocre sub: /r//2healthbars/

1) I am aware of that sub, it's beautiful

2) I join chat after weeks and you ping me. 10/10

A _

12:51 PM

Who's betseg?

~~who's A_~~

@A_ @betseg is betseg.

@betseg I wish I could say something about a telepathic connection we have but I'm afraid it was just a coincidence

how you been

1:06 PM

good, and you?

have you been busy?

yeah kinda

uni and stuff

I can relate:)

AOC in 2 weeks tho

aoc?

advent of code

1:10 PM

Dec 4 '18 at 20:05, by betseg

ok i created a private leaderboard, join with 383923-1cc3bff3

10 stars dam

10 stars is my 11th most starred message wow lol

@betseg how about now?

10th lol

did you join?

or are you gonna do the challenges?

1:14 PM

join what?

the advent of code leaderboard

oh, I didn't know you were talkinga bout that in the message you linked:)

I have no idea how it works, just register on adventofcode.com?

last year's results

yes you join on there, then use that code to enter a private leaderboard

I probably don't have time to participate:/

rip

you dont have to do them instantly tho, do whenever you have time, have fun

brb

Q: Euclidean Distance Between Two Matrices

1:31 PM

New Main Posts

Your task is to write the shortest algorithm in a language of your choosing that accomplishes the following: Given two matrices it must return the euclidean distance matrix (https://en.wikipedia.org/wiki/Euclidean_distance_matrix). Below is an example: a = [ 1.0 2.0 3.0; -4.0 -5.0 -6....

matrix

2 hours later…

New Main Posts

4:00 PM

Q: Convert into Chinese Numbers

A problem similar to Convert Chinese numbers, however, more complex. Also, answers given there mostly don't satisfy all the conditions. Chinese digits/numbers are as follows: 0 零 1 一 2 二 2 两 3 三 4 四 5 五 6 六 7 七 8 八 9 九 10 十 100 百 1000 千 10000 万 10^8 亿 Multiple-digit numbers are created by adding...

code-golf conversion unicode

4 hours later…

8:29 PM

Well that's a first. I just "updated" the wrong file on Github, twice

The same code, copy pasted into the same wrong file, twice

@cairdcoinheringaahing so you decided to tell us about it twice :)

@ngn Of course, got to keep the streak going :P

totallyhuman

chat.stackexchange.com/transcript/message/52589560#52589560 i hadn't realized i quit that early

wow

isaacg

8:46 PM

Whew - Determine if a Graph is Toroidal - what an adventure

totallyhuman

i commend you for having the patience to golf that

@isaacg Very impressive!

Does this mean that this MO question is wrong?

isaacg

@cairdcoinheringaahing More like I went for an option not listed there - the simplest imaginable algorithm, simpler than anything listed at that answer. But it's incredibly slow, slower than anything listed there, so it's not something that can be called a "standard algorithm"

And even so, I had to teach myself a bunch of combinatorial graph theory I'd never seen before in order to write it

The bash single caret case modification expansion doesn't work for me either or TIO or my own system: Try it online! . Anyone know why? Expected output for ${a^l}: heLlo

9:08 PM

@Jonah man bash: "the ^ and , expansions match and convert only the first character in the expanded value."

note that it's the first from the value, not the first that matches

@ngn oh it's literally the first character... i see. ty.

also there is no way to do backreferences in the pattern subtitution expansions like ${var/str/replace}, right? it's straight up replacement only?

@Jonah it's not even regex

right.

9:55 PM

Another bash golfing question. Say we have an array arr and wish to join its elements with some (not necessarily single character) string. You can do x=$(printf '%s--' ${arr[@]}); echo ${x%--} to join them with --. Try it online!. Can this be improved?

10:09 PM

@Jonah can your array elements contain spaces?

if not, maybe x=${arr[*]}; ${x// /--}

@ngn oh i like that. and if they can, is mine the best you could do? (the printf array arg would need to be quoted, ofc)

A: Sandbox for Proposed Challenges

@Jonah another option is to use IFS=c where c is a special character that doesn't occur in the strings

then replace c with -- like above

example

New Sandboxed Posts

How short can you get? You are to write a program that, when given one of five distinct inputs, you output one of Code, Golf, and, Coding or Challenges. The inputs can be any five consistent and distinct things (e.g. 12345, abcde, etc.), and each can map to any of the five outputs. However, the ...

@NewSandboxedPosts That was fast

10:30 PM

@ngn ty

dzaima

10:47 PM

@NewSandboxedPosts in a stack-based lang, would repeating a flatten built-in infinitely and the inputs being ["G", "o", "l", "f"], etc count for infinite score?