The Nineteenth Byte

lyxal

14:00

14

The Challenge Given a string indicating the symbolic notation of UNIX permission of a file and its ownership (user ID and group ID), decide whether a given user A has permission to read / write / execute it. Related. Permissions in UNIX system In UNIX, every file has three classes of permissi...

Did I read this as "Do I have Parmesian?"

maybe

is that so terribly bad?

DialFrost

yay my pfp changed @lyxal :3

nice little D :D

Btw anyone here use SO and have some experience in outside programming?

:62198867 sus

thejonymyster

@DialFrost what is outside programming

DialFrost

@thejonymyster like normal coding

I saw this user putting bounties up on his qns

and they seem very interested in understand how apple does stuff

which they probably cant get

E.g. they want to know how they selected an image (removing background), apple has a page describing it (but the OP says it's not as good as it seems when apple shows the product), so they're saying that they want to know how they did it

But of course this means apple is using high-end API which they dont want anyone to get

soooo what advice do I give?

mousetail

14:16

Like how to do a CSS effect? Or a internal undocumented MAC api?

DialFrost

@mousetail no

internal undocumented api

Link: stackoverflow.com/questions/73743473/…

The OP also asked another 2 questions and boutnied them both lmao

mousetail

Yea really hard to figure out info on that, there are these whole reverse engineering comunities that probably know but it's hard to find them

DialFrost

@mousetail yup

thejonymyster

i feel like your comment is sufficient if you dont actually have insider info

mousetail

Wait no that's not a internal API at all

DialFrost

14:17

@thejonymyster ?

@mousetail eh

mousetail

They just want to train a neural net in the same way apple does

DialFrost

not sure what you meant by interal but ok

@mousetail that's even harder!!!

thejonymyster

@DialFrost your comment on the linked post says all that you probably need to say

DialFrost

@thejonymyster mkay

mousetail

@DialFrost No much easier lol

Ginger

14:18

40 bronze badges!

thejonymyster

thats my opinion anyway /shrug

@Ginger gg :tada:

DialFrost

@Ginger ?

mousetail

The question should be closed as needs more focus though, that's a much too broad subject for a answer

DialFrost

@mousetail I have no experience at all in neural nets so ya

Ginger

DialFrost

14:19

@Ginger ah

I got 53 <3

Ginger

neat

DialFrost

with around the same rep as u

u have a lot of silver lol

@mousetail has a bounty on it :/

mousetail

My Stack overflow rep is ready for halloween

DialFrost

lol

btw is this user's other question fine? stackoverflow.com/questions/73776803/…

mousetail

@DialFrost Bounty gets refunded if post is closed

DialFrost

14:21

@mousetail oh

The user seems to want to copy apple

Ginger

@DialFrost well a lot of them are related to questions, and I have a few misc ones for meta and voting

DialFrost

lmao

mousetail

Honestly I'd ask in the firewatch chat, a lot more experienced close voters there than me

Someone want to give me a 1K bounty on SO so I can have 6,666 rep? /s

DialFrost

@mousetail hehe

Ginger

lol

New Posts

14:24

1

Q: Implement the flip-floperator

Ruby has a strange operator, .., called flip-flop (not to be confused with the range operator, which looks the same). Used in a loop, flip-flop takes two conditions as operands and will return false until the first operand is truthy, then return true until the second operand is truthy, whereupon ...

code-golf functional-programming

DialFrost

oh well gn guys

o/

Ginger

\o

mousetail

@NewPosts WTF is that operator? This violates how expressions are supposed to work

DialFrost

@Ginger \o

@mousetail flip-flop? That's in conway's game of life :3

mousetail

?

DialFrost

14:28

@mousetail conwaylife.com/wiki/Phoenix_1

Pheonix_1 is also called a flip-flop

mousetail

Ok but that has no relation to the ruby operator that implicitly stores data somewhere outside of the normal syntax

Sʨɠɠan

@DialFrost o thats cool

DialFrost

@mousetail lol

Sʨɠɠan

anyone ever heard of a brainf machine? as in a cpu whose opcodes are bf instructions?

DialFrost

the moment I saw flip-flop i thought of that

not some weird ruby expression

mousetail

14:30

Like I know what a flip flop is in electronics too which is also something entirely different

Newly Featured Posts

11

Q: Multiplying substrings

Write a program that takes two integers as an input; the first can be any integer and the second is less than or equal to the number of digits in the first number. Let these numbers be a and b respectively. The program will do the following Concatenate a minimal number of 1s to the end of a so...

code-golf math number

10

Q: Reduced Row-Echelon Form of a Matrix

The goal of this challenge is to create a program that takes in a matrix and outputs its reduced row-echelon form. A matrix is in reduced row-echelon form if it meets all of the following conditions: If there is a row where every entry is zero, then this row lies below any other ...

code-golf math matrix linear-algebra

Sʨɠɠan

@user whyd ya leave?

Ginger

TIL I Learned that of the users that are in this room right now, I have the 4th highest message sent count (13.2k)

mousetail

14:46

... what a incredibly useful thing to know

Sʨɠɠan

how can you tell

Ginger

It shows it in the room info in the bottom right corner of the user cards on the right side of the screen

PyGamer0

@Ginger how about now? :P

Ginger

now it's 5th :\

Sʨɠɠan

whaat only 3.6k

Ginger

14:50

lol

graffe

what asymptotic solution do you get if T(n) = 3T(sqrt(n)) +1 and T(n) = 1 for n < 10,say.

as in big Oh notation

mousetail

You can't have a asymptotic solution for n<10, a asymtotic solution is a limit when n goes to infinity

graffe

yes sorry.. I mean the recurrence is T(n) = 3T(sqrt(n)) +1 and you also need a base case so we say that when n is small T(n) is 1

so the question is what is the solution in big Oh notation for large n

mousetail

Oh like that

It's a very good question though IDK, gonna think about it a little

graffe

thanks!

if only there was open source code that would just tell me

mousetail

15:00

It's def sub-exponential since T(N) = C * T(N - D) would be exponential

graffe

that's good

PyGamer0

is there a online interpreter for flurry?

thejonymyster

is there a word for the distance from the average

besides the full phrase :P

mousetail

deviation?

Sʨɠɠan

i think its the variance

graffe

15:06

standard deviation is in the right units

mousetail

variance is more like the average squared distance from the average

Not sure if you mean that or the deviation of a singular data point

thejonymyster

i just want the like, raw number

like

for data 4 5 6 7 8, their <word?> are 2 1 0 1 2 (or -2 -1 0 1 2)

Aiden Chow

Mean deviation?

thejonymyster

ive never known a term for it so i cant like, confirm anything

mousetail

deviations seems to work

thejonymyster

15:09

works for me

mousetail

it's not a mean, since it's only for a specific data point

thejonymyster

why are all of my ideas hard to phrase in words

3

Aiden Chow

@thejonymyster mathworld.wolfram.com/MeanDeviation.html

thejonymyster

@AidenChow nah, i need to map each element to another value yea

not like, a value from the entire thing

Aiden Chow

@mousetail oh I didnt realize that

thejonymyster

15:11

my next difficult thing is that

i have some strings of length X, and i want to take the average of the 1st of each, then i want to take the average of the 2nd of each, then the 3rd of each, all the way up to X

wait wait

nvm that was the word i was missing, "each"

Aiden Chow

I think deviations or absolute deviations should work in that case

wait not for ur new thing

thejonymyster

yea imma go with deviations, seems like ppl are on board

dw ik ik

wait i need to think harder i think that what i was asking for is not actually useful :P

ill be back when i understand more

Aiden Chow

Understand what?

thejonymyster

more of what im trying to do

im confusing myself over here

ok apologies if this is a clusterduck, there isnt exactly a cmc sandbox:

CMC: code-challenge implement the AND, OR, XOR, NAND, NOR, and XNOR gates (two inputs only), each taking input in the same format and each outputting in the same format. Additionally, all six solutions must be the same length. Scoring: For each n in 1 < n < solution length, take the sum of the (absolute) deviations of the nth elements of each solution. Your score is the sum of these sums. Smallest score wins.

acutally that scoring is so complicated i should just regular sandbox it :P

and pick a different task

not gonna delete it from here though have fun if you wanna do it

mousetail

Maybe (absolute) instead of (unsigned) is less confusing?

thejonymyster

15:22

yea

mousetail

I'm really confused though, what is the nth element of each solution?

thejonymyster

right that was the second hard thing to describe

oh sorry

cant edit anymore, i meant "character"

mousetail

Ok so the goal is to do this using characters that are very close together in byte values?

thejonymyster

yea so like

6 identical programs/functions would be a perfect score regardless of length

(but thats impossible :P)

mousetail

What average though? The average for that solution, or the average for that character position? Or the overall average of every character in every solution?

thejonymyster

15:24

right see how hard it is to phrase

ABC ABC ABC ABC ABC ABC gets score 0, since the deviations of all the As are 0, etc

so yea the average for that character position yea

maybe itd be worth looking at a different scoring method, just so its less complicated

mousetail

Ok, I think you could do something like a=lambda i:...,b=lambda i:..., etc shared between all solutions then only the last character is different. So a=lambda a,b:a&b;b=lambda a,b:a|b;a a=lambda a,b:a&b;b=lambda a,b:a|b;b

Sʨɠɠan

@mousetail i think deviation is the word... i just learned abt this

Deviation (statistics)

In mathematics and statistics, deviation is a measure of difference between the observed value of a variable and some other value, often that variable's mean. The sign of the deviation reports the direction of that difference (the deviation is positive when the observed value exceeds the reference value). The magnitude of the value indicates the size of the difference. == Types == A deviation that is a difference between an observed value and the true value of a quantity of interest (where true value denotes the Expected Value, such as the population mean) is an error. A deviation that is the...

mousetail

Basically you are including every solution in every answer then using just one character at the end to select which one to use

thejonymyster

ah, i see

correct, that would work lol

ok, need a better scoring system then :P

back to the drawing boarg

DLosc

15:47

RO question: is there a way to cancel stars on really old messages? I can't find a way to do it from the transcript or the "starred messages" list.

Ginger

maybe by POSTing the message ID?

Aiden Chow

16:01

44

Q: Allow cancelling of stars from message

Currently, the only way to cancel stars in a chat transcript is when the chat-message is visible in the chatroom's sidebar. However, in a fast-moving, multi-star chatroom, the window of opportunity to cancel can be short, and rapid changes in starring can quickly make this impossible to do in ...

feature-request chat moderator-tools chat-stars chat-transcript

thejonymyster

is there a good way to find answers in a language with a 1 letter name

trying to find as much info as i can about that W language that got deleted lol

DLosc

@AidenChow Ah, there's a userscript. Thanks!

thejonymyster

mostly posted by this deleted user

Aiden Chow

@thejonymyster like this?

thejonymyster

aha

didnt know you could do that

thanks

Aiden Chow

16:06

np

thejonymyster

gonna start saying p instead of np to confuse the computer scientists

mousetail

It's the same thing

4

caird coinheringaahing

16:29

~~Site's down for maintenance :/~~ Never mind, it's immediately back

mousetail

Why does SE need to go down for maintanance so often? No other major website does this

Sʨɠɠan

ikr

does google ever go down?

thejonymyster

chat, running on a mixture of hopes dreams and blood sacrifice, carries on

Radvylf Programs

Difference is that Google can invest massive amounts into datacenters with crazy amounts of redundancy

And it loses a lot more money if it goes down than SE does

And even then, major sites do still have outages occasionally

They just tend to be more localized or specific to certain parts of their service(s)

E.g., Google Classroom had been having issues all of last week, at least where I am

caird coinheringaahing

One common thing with SE's maintenance is that they have to do semi-regular data transfers between their data centres, one in NJ and one in CO

Sʨɠɠan

16:46

Google services outages

During five episodes, one in 2018, three in 2020, and one in 2022, Google suffered from severe outages that disrupted a variety of their services. The first was a YouTube outage in October 2018. The second was a Gmail/Google Drive outage in August 2020. The third, in November 2020, affected mainly YouTube, and the fourth, in December 2020, affected most of their services. The fifth, in August 2022, affected Google Search, Maps, Drive and YouTube. These outages seemed to be global. == October 2018 YouTube outage == On 16 October 2018, a global outage disrupted YouTube for approximately one hour...

they had one 2 months ago

thejonymyster

using google and noticing an outage vs having 5 or 6 sites you visit maximum

mousetail

17:02

@Sʨɠɠan Search is so distribted it's nearly impossible to take down. There is no single point of failure. Also since search doesn't need to be super up to date the different DBs don't need to be in sync all the time.

pxeger

17:21

Google Accounts and many other Google services go down equally rarely, but have much stronger consistency requirements than search

mousetail

17:41

There have been outages there, slightly more often than search

Radvylf Programs

18:02

Ever wanted to see a piece of paper violently trying to unfold itself?

gist.github.com/Radvylf/a709931bc357586f594109bb68ff47a6

Ginger

neat

Radvylf Programs

I've seen it get close, but never achieve the full 6×4

Ginger

what is that for?

Radvylf Programs

@Ginger It's a softbody simulation with some tweaks

Ginger

cool

Sʨɠɠan

18:04

ive seen a similar thing, except it was a soft body desmos sim and if you jammed the nodes too close, itd jerk around like that for a bit then blow up

@RadvylfPrograms you might have tangled it beyond repair?

Ginger

that could make a neat screensaver :p

Sʨɠɠan

^

Radvylf Programs

I could make it bounce off the edge of the screen

Sʨɠɠan

hmm are there screensavers that take html?

mousetail

A screensaver is just a executable (on windows)

Sʨɠɠan

18:06

screensaversplanet.com/screensavers/html-616

mousetail

So you could set your browser as a screensaver with some options

Radvylf Programs

It feels a little more screensaver-y at 1/10th speed

Ginger

I'm not even sure it can untangle itself :b

Radvylf Programs

18:23

It can, it apparently is just very unlikely

Ginger

@Sʨɠɠan hey I discovered how to reproduce the desmos sim's "explodey" function

it becomes... very interesting

Sʨɠɠan

examples?

Ginger

it's actually pretty simple

first, you will want to add some code that sets the fixed value of at least one point to true

second, just find the line var i = 0; and replace the zero with any number above 0

with numbers in the range of 0.1 and numbers above like 20 it actually looks really cool

Radvylf Programs

what the...

Ginger

radvylf, could you explain what that does for us?

Radvylf Programs

18:29

It makes all of the indexes invalid so it has no clue how any of the points relate to any of the others

So they just randomly jitter around

Ginger

cool

found that while I was trying to figure out how to make the springs more aggressive

Radvylf Programs

Multiply a constant factor by dist

The one on line 121

Ginger

neat

uh that just made it smaller

method that does work: replace the 0.8s a few lines below that with something above 1

Radvylf Programs

Oh wait... yeah

Sʨɠɠan

give me teh codez

Radvylf Programs

18:33

Multiply 123 and 124 then

Ginger

well that actually replicates explodey again but more accurately

Radvylf Programs

If you don't want it to explodey, try increasing slowing and the maximum value of the for loop on 193

You may need to increase the energy loss then

128 & 129

Ginger

oh wait, I was multiplying the wrong numbers

nvm that

Sʨɠɠan

Ginger

anything else that sim can do?

Radvylf Programs

18:46

Yeah all sorts of stuff

Ginger

okay, show us some pretty physics :p

Radvylf Programs

You can make a catenary sort of thing if you put all the points in a line

Ginger

maybe make it so you can upload a file with a list of points and springs so we can test different things?

Radvylf Programs

You can enable gravity and add a line for the shape to bounce off of

@Ginger You can just populate the points and springs arrays manually, JSON would do

Ginger

I know, but I'm lazy

can you make it so we can just upload a JSON file?

Radvylf Programs

18:48

That's a huge pain

Ginger

oh yeah? watch this

@RadvylfPrograms where's that stylesheet you use to make pretty looking forms?

Radvylf Programs

"you" as in me or someone in general?

Ginger

19:04

you specifically

you used it for the tank game

Radvylf Programs

I don't use a consistent stylesheet

Ginger

well I liked the one you used in the tank game

Radvylf Programs

Usually looks something like this:

input[type=text], input[type=number] {
    border: 1px solid #bbbbbb;
    padding: 4px;

    font-size: 12px;
    font-family: inherit;
    line-height: 1.25;
}

input:focus {
    border: 1px solid #66b8ff;
    outline: 1px solid #66b8ff;
}

Ginger

lookwhatididradvylf.gingerindustries.repl.co

Unrelated String

@RadvylfPrograms dumb question, is there an easy way to run this in browser without downloading it onto my filesystem

Ginger

19:11

@UnrelatedString lookwhatididradvylf.gingerindustries.repl.co (you'll need to provide a model file first)

lemme make one for the exmaple

Unrelated String

ah

that would explain why i just got a white screen when i tried pasting it into about:blank with inspect element :P

Ginger

no, you don't need a model file for the default one

the link I provided was modified by me to use model files

Unrelated String

ah

in that case my question still stands :P

Ginger

uh radvylf I don't think it's working

I loaded a file and the points are jittering around randomly

Unrelated String

what's weird is it seems like when i use the "raw" button on the gist it seems like the page is in fact that exact html file, but it displays to me as text instead of serving the actual document

Ginger

19:24

wait, springs don't have collision???

what's that about

Radvylf Programs

19:56

@Ginger You'll need to disable the random jittering

@Ginger I don't have any collision set up yet

flawr

20:48

@cairdcoinheringaahing 'grats! may the hat protect your brain cells!

I must say I'm a little bit disappointed that you wear a non-christmassy hat now that we're in the christmas season

caird coinheringaahing

@flawr Thanks! Tho it's unfortunate I didn't have the santa hat on at the time :(

@flawr Halloween holds the line :P

It can't be Christmas time until after Halloween happens :P

flawr

I'm pretty sure halloween happened last year

so it definitely is christmas time now

caird coinheringaahing

Good point, didn't think of it that way :P

flawr

see, the wrong hat makes your CTU (central thinking unit) completely confused

caird coinheringaahing

One side benefit of being a mod: I now have access to my old SE hat profile picture. I lost it a few months ago when I lost the USB it was on, but thanks to special mod powers, I can get it again :P

flawr

20:52

oooh neat:)

can you also access the ones of other users?

caird coinheringaahing

Maybe? Might need to go have a look

Yeah, looks like we can

emanresu A

21:12

Huh

Sʨɠɠan

21:51

YES

after 2k lines of code my first Rol program just successfully transpiled

original:

var a = "z"
var b = "a"
a = b + "c"

transpiled:

-- ROLMETA {"version":1,"package":"unnamed","functions":[],"variables":[]}
local a_cf0c61161
a_cf0c61161 = "z"
local b_cf0c61162
b_cf0c61162 = "a"
a_cf0c61161 = (b_cf0c61162 .. "c")

Radvylf Programs

Nice!!

Sʨɠɠan

now time to try out hello world

aaand ofc i have to forget that arguments are, in fact, variables

lyxal

~~time to ditch scala and use Rol for vyxal 3~~

Sʨɠɠan

22:19

well, after fixing the consequences of not considering arguments variables, it works:

extern print(arg) is luaPrint

fun print(arg: String) {
    luaPrint(arg)
}

print("Hello, World!")

is transpiled to:

-- ROLMETA {"version":1,"package":"unnamed","functions":[],"variables":[]}
function print065fb2adarg_cf0c61117a56(arg_cf0c61117a56)
	print(arg_cf0c61117a56)
end
print065fb2adarg_cf0c61117a56("Hello, World!")

~~i totally needed to define a whole print function when calling the extern would have been just fine~~

ofc ill have an stdlib print, this is just because i cant import any other files yet

DialFrost

23:35

What's Rol?

@Sʨɠɠan ^

@cairdcoinheringaahing wait what

caird coinheringaahing

@DialFrost We can see everything. Even the really embarrassing thing you did 4 years ago that you think no one saw, but really, us mods saw it

DialFrost

@cairdcoinheringaahing lmao

(I wasn't here even a year ago)

:3

caird coinheringaahing

@DialFrost I wasn't referring to anything on the site, I mean that embarrassing thing you did IRL 4 years, 7 months and 2 days ago.

lyxal

hey wait a minute

you telling me creating this code golf account was embarrassing?

caird coinheringaahing

@lyxal First off, that was 4 years, 7 months and 12 days ago, and second, holy crap, that random time frame was super close :P

lyxal

23:43

5 days

caird coinheringaahing

According to your profile, you joined 3rd Oct, 2018

Remember, SE uses American dates

lyxal

7 months ago wouldn't be october

I joined in March 2018

that's when I get my yearling badge

caird coinheringaahing

Right, cause SE uses American dates

lyxal

2018-03-10 03:31:17Z is the timestamp it gives me for account creation date

caird coinheringaahing

I can do brain things

lyxal

23:46

March 10 2018

if I had made this account in October, it'd only be 4 years old now

DialFrost

@cairdcoinheringaahing ya ik

lyxal

not 4 years and 7 months

DialFrost

@cairdcoinheringaahing oof

@lyxal caird's indirectly blaming you :D

Ginger

skibpido

DialFrost

@Ginger being chased by bees again?

Ginger

23:56

no, I teleported them to lyxal's house so he could eat them

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