The Nineteenth Byte

Believe it or not, we do not yet have a code golf challenge for a simple primality test. While it may not be the most interesting challenge, particularly for "usual" languages, it can be nontrivial in many languages. Rosetta code features lists by language of idiomatic approaches to primality te...

TùxCräftîñg

8:18 AM

kthx

tatatat0

Also, if the challenge asks for an output can I assume an address is the output?

Destructible Watermelon

@tatatat0 I think it would be best if you just looked at this question, for answers like this

7

A: Default for Code Golf: Input/Output methods

Assembly programs may write output to some specified memory location If there are no I/O devices available, an answer might consist of a subroutine that writes its output values to some specified memory location (e.g. write a machine word to $0000).

tatatat0

Thanks

feersum

@DestructibleWatermelon That's no good since x86 has real functions.

You should use a standard calling convention like cdecl or stdcall.

TùxCräftîñg

__fastcall

generally cheaper in bytes

Destructible Watermelon

8:34 AM

so... quiet

tatatat0

Its like 3:30 am here. Thats probably why.

I hate it when a stack exchange site tells you go to another stack exchange site and the other site to tell you to go back to the original site. smh

Destructible Watermelon

what are you referring to?

tatatat0

puzzling.se sending me to math.se because I asked a math puzzle.

:/

math.se then sending me to puzzling.se because they don't do puzzles

Destructible Watermelon

well, that's entirely wrong because they actually do maths puzzles

I'VE SEEN IT

tatatat0

they didn't do mine. :(

TùxCräftîñg

8:40 AM

^^ & ^^^

Destructible Watermelon

@tatatat0 JERKS

tatatat0

Yeah, I just wanted to know how many atoms of oxygen did the chicken use to cross the road.

Destructible Watermelon

...

wat

tatatat0

lol

Destructible Watermelon

How is this on-topic on any site?

tatatat0

8:44 AM

it involves math, and its pretty hard.

and chickens?

I had a more fleshed out question

Destructible Watermelon

I take back my comment on their decision being incorrect

tatatat0

pastebin.com/awtVYVyx

TùxCräftîñg

halp my modulus algorithm is borked

def mod(a, b):
    _a = 0
    while _a < a:
        _a += b
    return _a - a

Destructible Watermelon

I will help!

so, what is it exactly supposed to do?

TùxCräftîñg

a % b

Destructible Watermelon

8:47 AM

it does b%a

TùxCräftîñg

...

Destructible Watermelon

def mod(a, b):
    _a = 0
    while _a < a:
        _a += b
    return _a - a
print(mod(3,4)==4%3)

does True

tatatat0

Can't you use bitwise operations to make it a little easier?

TùxCräftîñg

yes i can

$ python /d/modulus.py
109 23 86 17

nope dont work

tatatat0

Cool, I'll just jet before I suggest how. I'm tired. Have a nice day!

srry

TùxCräftîñg

8:49 AM

(the format is a b mod(b a) a % b)

Destructible Watermelon

yep, doesn't work

what you were trying to do wasn't going to work anyway

so, why aren't you just using %?

TùxCräftîñg

i am trying to pseudocode wilson theorem for a 6502 CPU

Destructible Watermelon

It doesn't work if b>2*a

TùxCräftîñg

...

Destructible Watermelon

you'd have to use floored division to make this function work without changing it wholly

I think

TùxCräftîñg

8:55 AM

$ python /d/modulus.py
2 % 1 = 1 | 0
3 % 1 = 2 | 0
3 % 2 = 1 | 1
4 % 1 = 3 | 0
4 % 2 = 2 | 0
4 % 3 = 1 | 1
5 % 1 = 4 | 0
5 % 2 = 3 | 1
5 % 3 = 2 | 2
5 % 4 = 1 | 1
6 % 1 = 5 | 0
6 % 2 = 4 | 0
6 % 3 = 3 | 0
6 % 4 = 2 | 2
6 % 5 = 1 | 1
7 % 1 = 6 | 0
7 % 2 = 5 | 1
7 % 3 = 4 | 1
7 % 4 = 3 | 3
7 % 5 = 2 | 2
7 % 6 = 1 | 1
8 % 1 = 7 | 0
8 % 2 = 6 | 0
8 % 3 = 5 | 2
8 % 4 = 4 | 0
8 % 5 = 3 | 3
8 % 6 = 2 | 2
8 % 7 = 1 | 1
9 % 1 = 8 | 0
9 % 2 = 7 | 1
9 % 3 = 6 | 0
9 % 4 = 5 | 1
9 % 5 = 4 | 4
9 % 6 = 3 | 3
9 % 7 = 2 | 2

nope, the function is entirely borked (left my algorithm, right a % b)

Destructible Watermelon

I think it's actually b>=2*a

it works otherwise, actually

it works iff b<2*a

anyway, I'm going to post pictures of my crappy physics simulator muhAHAHAHAHA

TùxCräftîñg

ööö

ASCII-only

@TùxCräftîñg it's b - a + _a, I think

Destructible Watermelon

is it?

TùxCräftîñg

@ASCII-only nope :/

ASCII-only

9:00 AM

a is overshot from _a

so change < to <=, and use a - _a + b, I think

Destructible Watermelon

I think the only real way to do it, with no division, is this

TùxCräftîñg

omg it works \o/

ASCII-only

test 2 % 1

TùxCräftîñg

0

$ python /d/modulus.py
2 % 1 = 0 | 0
3 % 1 = 0 | 0
3 % 2 = 1 | 1
4 % 1 = 0 | 0
4 % 2 = 0 | 0
4 % 3 = 1 | 1
5 % 1 = 0 | 0
5 % 2 = 1 | 1
5 % 3 = 2 | 2
5 % 4 = 1 | 1
6 % 1 = 0 | 0
6 % 2 = 0 | 0
6 % 3 = 0 | 0
6 % 4 = 2 | 2
6 % 5 = 1 | 1
7 % 1 = 0 | 0
7 % 2 = 1 | 1
7 % 3 = 1 | 1
7 % 4 = 3 | 3
7 % 5 = 2 | 2
7 % 6 = 1 | 1
8 % 1 = 0 | 0
8 % 2 = 0 | 0
8 % 3 = 2 | 2
8 % 4 = 0 | 0
8 % 5 = 3 | 3
8 % 6 = 2 | 2
8 % 7 = 1 | 1
9 % 1 = 0 | 0
9 % 2 = 1 | 1
9 % 3 = 0 | 0
9 % 4 = 1 | 1
9 % 5 = 4 | 4
9 % 6 = 3 | 3
9 % 7 = 2 | 2

the testcases works \o/

ASCII-only

@TimmyD but aren't seagate drives really unreliable

TùxCräftîñg

9:02 AM

now i am ready to implement it in 6502

Destructible Watermelon

oh, you figured it out actually!

TùxCräftîñg

@ASCII-only thx

oh wait

since (n-1)!² can generate big numbers (> 255) for little n i think wilson theorem will not work

:(

Destructible Watermelon

crappy physics simulator

as in not finished yet

TùxCräftîñg

0

A: Print/Output the L-phabet

Neoscript, 62 bytes (non-competing) a='A:[]:'Zeach n=0:[]:25console:log(a[n]*n+a:slice(n):fuse());

even by beating cheddar i dont get upvotes ;_;

Destructible Watermelon

everyone knows you get upvotes by posting a link and an underscore between semicolons

ASCII-only

9:11 AM

@TùxCräftîñg wilson's theorem looks more inefficient than trial division

because you have to multiply by every number between 1 and n

HiggsBot

( ͡° ͜ʖ ͡°)

Destructible Watermelon

@TùxCräftîñg Higgsbot is borked

TùxCräftîñg

...

ASCII-only

yus i have browser in browser now

Destructible Watermelon

why did you post borked link?

ASCII-only

9:16 AM

@DestructibleWatermelon ?

HiggsBot

y u know, we are not on your localhost

Destructible Watermelon

is borked

you make me sad

ASCII-only

@HiggsBot whoops, fixed

Destructible Watermelon

semicolon underscore semicolon

TùxCräftîñg

chrome send the ping sound 2 times ಠ_ಠ

ASCII-only

9:17 AM

note: don't browserception because it breaks things somehow

Destructible Watermelon

why is borked

ASCII-only

@DestructibleWatermelon ?

TùxCräftîñg

brb trying to browserception

Destructible Watermelon

it is just blank screen

ASCII-only

@DestructibleWatermelon right click -> badly drawn globe

:O it works on non-localhost but not on localhost, why ;_;

TùxCräftîñg

9:19 AM

Destructible Watermelon

browser in browser is borked

ASCII-only

wat

whoops, my bad

should be fixed now

TùxCräftîñg

i have a GM script at ~/AppData/Roaming/Mozilla/Firefox/Profiles/pvy0joh7.default/gm_scripts/HiggsBot‌/higgsbot.user.js but when i try to install it in TM in chrome chrome want to download the script

but with a script on internet TM correctly install it

why?

Destructible Watermelon

is still borked

btw

TùxCräftîñg

^^

ASCII-only

9:23 AM

@TùxCräftîñg because TM can't access files

@DestructibleWatermelon how

TùxCräftîñg

@ASCII-only wat

but GM work

ASCII-only

@TùxCräftîñg it can't access file:// (i.e. filesystem)

Destructible Watermelon

¯\_(ツ)_/¯

TùxCräftîñg

@ASCII-only this dont make sense

brb searching the scripts folder

ASCII-only

well, it can access its own folder

but definitely not firefox's GM folder

Destructible Watermelon

9:24 AM

wtf am i even doing right noew

halp me

I am boorjkedc

borked

TùxCräftîñg

wat

Destructible Watermelon

do not know

βετѧ Λєҫαγ

Hey @Dennis I've updated interpreter.py

TùxCräftîñg

shit i have deleted the userscript

#genius

ASCII-only

yeah i think browser in browser should be fixed

zyabin101

9:28 AM

@TùxCräftîñg HiggsBot have 21 rep! \o/

TùxCräftîñg

found the script it's in the trashcan

now how do i install it in TM ;_;

ASCII-only

copy paste

TùxCräftîñg

but where is the installation folder of scripts?

the builtin editor is bad

ASCII-only

@TùxCräftîñg but it's good :(

TùxCräftîñg

i only use vim

ASCII-only

9:31 AM

you can save to disk (first button)

flawr

Aircraft Carrier Landings: "After the Cut" 1946 US Navy Pilot Training Film

►

VTCAKAVSMoACE

9:47 AM

@ASCII-only Figured it out.

ASCII-only

so you just ended up using a reverse proxy?

VTCAKAVSMoACE

@ASCII-only Yup.

It's overall better anyway, since there's no HTTP Auth credentials disclosure.

ASCII-only

wait, why do you even need credentials though?

VTCAKAVSMoACE

@ASCII-only Because Server B is protected by HTTP authentication.

That's the whole reason for the question lol

ASCII-only

oh whoops

VTCAKAVSMoACE

9:52 AM

wooow

TùxCräftîñg

higgsbot work \o/

ASCII-only

@VTCAKAVSMoACE why is it authenticated if you need a client to access files from it though? is it just that one specific file accessed from one specific server?

TùxCräftîñg

tux-need-to-fix

ASCII-only

@TùxCräftîñg +1

Releasing Helium Nuclei

My phone's headphones has a jack

But my computer wants 2 jacks

Halp can i haz it

TùxCräftîñg

10:07 AM

y u need a adapter

Releasing Helium Nuclei

Thx

Destructible Watermelon

I want to make an esolang but I can't make an esolang so I don't want to

eughhhh

Cognitive dissonance

In psychology, cognitive dissonance is the mental stress or discomfort experienced by an individual who holds two or more contradictory beliefs, ideas, or values at the same time; performs an action that is contradictory to one or more beliefs, ideas, or values; or is confronted by new information that conflicts with existing beliefs, ideas, or values. Leon Festinger's theory of cognitive dissonance focuses on how humans strive for internal consistency. An individual who experiences inconsistency (dissonance) tends to become psychologically uncomfortable, and is motivated to try to reduce this...

I want to do something but don't want to do something

eughhhhhhh

TùxCräftîñg

halp mindfuck detected

VTCAKAVSMoACE

@ASCII-only Because the files hosted on Server B are not supposed to be publicly accessible. Server A has its own authentication through non-simple authentication.

Destructible Watermelon

@TùxCräftîñg watisit

TùxCräftîñg

10:14 AM

3 mins ago, by Destructible Watermelon

I want to do something but don't want to do something

@anybodywhoknowhowtmwork where is the scripts stored?

Releasing Helium Nuclei

@TùxCräftîñg dis ok? amazon.com/gp/aw/d/B00JWVR880/ref=pd_aw_sim_23_1

TùxCräftîñg

lꝏk ok

VTCAKAVSMoACE

@DestructibleWatermelon Build a simple interpreter.

Destructible Watermelon

but that would require thinking a good idea I can interpret

not sure I feel like doing eseljik right now

When I started reading the wikipedia article about cognitive dissonance I experienced cognitive dissonance. Really

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

TùxCräftîñg

plz halp

where TM store scripts

Destructible Watermelon

10:19 AM

Wat is tm

TùxCräftîñg

tampermonkey

Destructible Watermelon

WHAT

TùxCräftîñg

a useful thing to execute userscripts

it's greasemokey on FF

Destructible Watermelon

I WANT TO LEAVE BUT I DON'T WANT TO LEAVE!!!

AAAAAAAAAAAA

ΛεγίωνΜάμμαλϠΨΠʹ

@TùxCräftîñg idk, try grepping for it

trichoplax

10:21 AM

@LeakyNun I think @El'endiaStarman summed it up pretty well. My point was that with some people saying there are too many alphabet challenges, the huge number of answers to that challenge shows a lot of people appreciate it. Incidentally, a lot of the answers are also detailed, with good explanations, which is further support for the challenge being useful.

Leaky Nun

@trichoplax I see, thanks

Which means...

more alphabet challenges \o/

βετѧ Λєҫαγ

TùxCräftîñg

( ͡° ͜ʖ ͡°)

βετѧ Λєҫαγ

Wth kind of error is undefined?

zyabin101

@βετѧΛєҫαγ Send that to Error'd!

Destructible Watermelon

10:23 AM

error got an error...

trichoplax

@LeakyNun I would call it sarcasm, yes. Sarcasm always involves a reversal/irony, but it doesn't need to be negative. It just always carries the risk that someone will think it is negative if they don't realise it is sarcasm.

Leaky Nun

@trichoplax I see

Destructible Watermelon

you know code is bad when your error throws errors

βετѧ Λєҫαγ

XD

trichoplax

@LeakyNun As long as they are good challenges and not duplicates I don't care about the theme :)

TùxCräftîñg

10:24 AM

wat

i dont have sqlite ಠ_ಠ

ΛεγίωνΜάμμαλϠΨΠʹ

@DestructibleWatermelon In some Mathematica stack-overflow errors, it errors attempting to display the error boxes

It continues until General::off stops repeated errors

TùxCräftîñg

@ΛεγίωνΜάμμαλϠΨΠʹ mathematica is weird.

definitively

ΛεγίωνΜάμμαλϠΨΠʹ

Jul 27 at 17:45, by LegionMammal978

Mathematica 10.1.0 for Linux x86 (64-bit)
Copyright 1988-2015 Wolfram Research, Inc.

In[1]:= Mathematica is weird

Out[1]= is Mathematica weird

Destructible Watermelon

10:37 AM

only just realised that stack cats is a palindrome :(

Quill

that's the joke

New Main Posts

0

Q: Fun with strings and string lengths

Introduction Inspired by Dyalog Ltd.'s 2016 student competition. The challenge there is to write good APL code, but this is a code-golf and it is open to all languages. Derived from this closed challenge. The real challenge here is to combine the various (quite trivial) parts of the problem in ...

code-golf string sorting statistics

flawr

@El'endiaStarman youtube.com/watch?v=Ip3X9LOh2dk

I really like this intuition, as it explains a lot e.g. the invariance under row transformation etc.

Destructible Watermelon

@Quill I'm disappointed it took me that long

Destructible Watermelon

10:56 AM

also why does python not have any any-base int to str function when it has str to int any-base?

Leaky Nun

11:22 AM

Because python's stupid that's why

Guys, what does "over" in "a thousand times over" mean?

TùxCräftîñg

Sandbox

Where you can play with chat features (except flagging) and ch...

2

if you want to bork higgsbot

brb

trichoplax

Your edit should not be an edit but a separate question. — Peter Taylor 4 hours ago

I agree with this comment, so I thought I'd show it to a wider audience in case anyone else wants to vote on it

New Main Posts

-1

Q: List of possible birth years of living humans

The Challange Output a list of years that starts with the current year and ends 120 years ago. Every living human has an age in years that is a number in this list. Details The list should be in descending order. Every built-in functions to manipulate arrays is allowed. Shortest code in byte...

code-golf date sorting

Leaky Nun

@trichoplax Can you help me?

trichoplax

I can try - what's up?

ΛεγίωνΜάμμαλϠΨΠʹ

11:33 AM

Just got the email: Mathematica 11 was launched today!

4

El'endia Starman

@flawr For me, there was a little flash of insight as to why matrices with zero determinant are not invertible: a transformation that squishes everything down to zero can't be reversed to the original state without already knowing the original state.

@ΛεγίωνΜάμμαλϠΨΠʹ Yay, more opportunities for "Why does Mathematica have that built-in?!". :P

Leaky Nun

@trichoplax See above

El'endia Starman

@LeakyNun It's somewhat like "again" or "repeatedly".

Leaky Nun

@El'endiaStarman Determinant is zero =/= squish everything down to zero

@El'endiaStarman any more example?

El'endia Starman

@LeakyNun *Squish all areas down to zero.

trichoplax

11:37 AM

@LeakyNun Is that a pun on "what's up"? Or am I missing something obvious? I'm a bit slow today...

Oh - a thousand times over. What @El'endiaStarman said

It's used for emphasis, and doesn't really add any meaning.

For example:
"I've told you a thousand times, don't exaggerate."
"I've told you a thousand times over, don't exaggerate."

El'endia Starman

@LeakyNun "You want me to try again? But I've tried it a thousand times over! It's not working!"

Leaky Nun

well...

@El'endiaStarman I mean another example of "over"

or must it follow number + times?

trichoplax

I've tried over and over without success

Leaky Nun

thanks

trichoplax

I've never thought about it, but now that I do it sounds weird

El'endia Starman

11:40 AM

@LeakyNun Well, it can also go with once and twice. "I've rebooted my computer twice over now."

Personally though, I almost never use "over" in that way (except the over and over phrase).

trichoplax

Although once over means something completely different

"I'll give the bike a once over and see if I can work out what's broken"

El'endia Starman

^ "once over" there is pretty synonymous with "look over".

Leaky Nun

look over == once over ??

El'endia Starman

@LeakyNun ¯\_(ツ)_/¯ English.

Seriously though, English can be pretty patchwork-y.

TùxCräftîñg

b4ck

El'endia Starman

11:48 AM

Wow, this picture is epic. If they're fighting against the dragon, epic. If they're fighting with the dragon, also epic!

@ConorO'Brien, is this ^ how you imagine yourself when you grow up?

TùxCräftîñg

PPCG need a reson to reject a edit 'dont golf in edits'

Sp3000

@DestructibleWatermelon Fun fact: Martin came up with the language idea mostly because of the name, which is why everything's a palindrome and why even length programs are always cat (unless there's an infinite loop in the middle)

Oh and er... stacks.

TùxCräftîñg

555 new functions in Mathematica stdlib

El'endia Starman

This is seriously cool:

Super Cooled Liquid Gold

►

orlp

12:11 PM

do you guys like paraprosdokians?

zyabin101

@orlp What is paraprosdokians?

orlp

Paraprosdokian

A paraprosdokian (/pærəprɒsˈdoʊkiən/) is a figure of speech in which the latter part of a sentence, phrase, or larger discourse is surprising or unexpected in a way that causes the reader or listener to reframe or reinterpret the first part. It is frequently used for humorous or dramatic effect, sometimes producing an anticlimax. For this reason, it is extremely popular among comedians and satirists. Some paraprosdokians not only change the meaning of an early phrase, but they also play on the double meaning of a particular word, creating a form of syllepsis. == Etymology == "Paraprosdokian" comes...

trichoplax

@El'endiaStarman I've done that with frozen drinks. It's amazing how quickly it spreads :)

Never occurred to me it could happen in a metal!

TimmyD

@ASCII-only Seagate had some definite hardware issues with their 3TB drives, but aside from that outlier they're pretty in line with industry average.

New Main Posts

12:43 PM

3

Q: Fix my IP address's missing periods

Sometimes when I'm typing out an IPv4 address, I get all the numbers right, but I forget to type one or more periods. I'd like to have a program (or function) that takes my broken IP address and outputs all possible valid placements of the missing periods. Input The input will be a string that ...

code-golf string networking

trichoplax

What would you prefer: a pay rise of 500 every 6 months, or a pay rise of 1600 every year?

Business Cat

1600 is more money

trichoplax

My hobby: spreading convincing misinformation

TùxCräftîñg

Mixed Content: The page at 'https://chat.stackexchange.com/rooms/1/sandbox' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://localhost:8877/?_=1470919725764'. This request has been blocked; the content must be served over HTTPS.

wut

Sp3000

@trichoplax What's the inflation/interest rate?

trichoplax

12:50 PM

@Sp3000 I guess if it's extreme you could make more money from less money up front, but that's not the mistake that caught my attention

VTCAKAVSMoACE

@Downgoat Does Cheddar have the binary operators?

Because you could overload the bitwise operators for mixing regexes rather than addition and it would be clearer:

/test/ | /regex/ = /(test|regex)/
/test/ & /regex/ = /testregex/

TùxCräftîñg

this is named 'bitwise operators'

VTCAKAVSMoACE

@TùxCräftîñg binary, bitwise, close enough. :P

New Main Posts

-2

Q: cat command.com > /dev/x86

For this golf, you have to create a Linux device in /dev that will execute raw x86 instructions written to it. Raw x86 machine code will be inputted; And it will be processed like a COM file. The test program is int main(int argc, char **argv) {` char x = 0x3F; char y = 0x25; short i...

machine-code

TùxCräftîñg

a binary operator is a operator taking 2 arguments

VTCAKAVSMoACE

12:54 PM

@TùxCräftîñg Yeah, I mispoke.

;)

TùxCräftîñg

@NewMainPosts wtf

VTCAKAVSMoACE

@TùxCräftîñg Yeah, VoteToClose much

trichoplax

@Sp3000 The question was asked in a book about not making assumptions and thinking carefully, so when I got a different answer from them I assumed I must have missed something. But having given it some thought I'm fairly sure they have a mistake in their table.

VTCAKAVSMoACE

Ah crap I hit the wrong reason

zyabin101

@VTCAKAVSMoACE Craps, you can't change your vote o_o

Nor retract it...

VTCAKAVSMoACE

12:57 PM

@zyabin101 I know :c

oh well everyone agrees anyway lol

Sp3000

@trichoplax Out of curiosity, what was their answer?

trichoplax