The Nineteenth Byte

Dennis

7:02 PM

@MartinBüttner Couldn't find anything shorter either.

New Main Posts

0

Q: Make a search engine

You need to make a program, that when giving a list and a string, searches on the list for the item that starts of finishes by the string. Examples: Input: th [thing, awesome, potato, example] Output: thing (Because it starts with "th") Input: ing [thing, potato] Output: thing (Because it ends...

Martin Büttner

hmmm I beat MATL and Pyth with CJam

something's fishy.

(probably the fact that the Pyth answer wasn't written by Jakube, orlp or isaacg)

@Dennis can Jelly do the El'endia's CA challenge?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Martin could you link me? I can't seem to find it.

Martin Büttner

codegolf.stackexchange.com/q/71970/8478 ?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

yeah that's it thanks :D

El'endia Starman

7:07 PM

@MartinBüttner There was a bit of discussion on this last night. Essentially, there are n/2 slots for the 1s, and there's a parity in that the slots can be the even or odd-numbered ones, so altogether, the upper bound is 2^(n/2+1), which many wire lengths hit (except for the -2). For example, a wire of length 10 has period 62, which is 2^(5+1)-2. Also holds true for e.g. 60, which has a period of 2^(30+1)-2.

Also...

Electrons bouncing in a wire

Discussion for the question codegolf.stackexchange.com/questio...

Dennis

@MartinBüttner I think so. I haven't tried.

Martin Büttner

@El'endiaStarman I see, thanks

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ futureState is what the next aliveness will be. That's how I avoid overwriting current states.

So it's actually not bounded by the Fibonacci sequence, but I can't figure out where your argument went wrong on that.

Martin Büttner

@Dennis the ]___&= is pretty painful... :/ any better ideas?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman Oh! So if I'm changing the state of a cell, I would do grid[y][x][0] = newState?

El'endia Starman

7:10 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ grid[y][x][2], rather.

[0] is the rule number.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Sorry, I meant the rule ^^"

El'endia Starman

Ha, then yes.

Martin Büttner

> Stack Exchange is currently offline, we'll be back shortly!

D:

El'endia Starman

I was just about to post that!

Cᴏɴᴏʀ O'Bʀɪᴇɴ

wait wat

El'endia Starman

7:12 PM

D: D:

Cᴏɴᴏʀ O'Bʀɪᴇɴ

At least we're still here...

muddyfish

noo

Martin Büttner

We are failong over services now, Stack Overflow and the rest of the network will be offline for about a minute.

Tweeted by Nick_Craver on February 14, 2016 at 7:11 PM

Dennis

Oh, that explains why I need 10 reputation to post more than 2 links...

@MartinBüttner How about _)&!?

Martin Büttner

nice :)

I'm currently looking into another idea using W%(#

trichoplax

7:19 PM

@El'endiaStarman Can each cell have a different rule? Does this allow rules to spread through the grid based on what is present in the surrounding cells??

Martin Büttner

We're back!

El'endia Starman

@trichoplax Yes. We're talking about Variations of Life, which was designed to allow mixing of rules.

Conor wanted to add more features.

@trichoplax Actually, I misread what you said. The rules cannot spread, but they can be mixed.

trichoplax

@El'endiaStarman That's interesting. The rules themselves only change based on user clicks though? My bafflement was at the thought of a cell changing what rule it uses each update.

@El'endiaStarman We're on the same page now :)

El'endia Starman

@trichoplax Correct.

:)

New Main Posts

-3

Q: How to set up .htaccess for wildcard subdomain?

I have a problem in my application. I'm trying to create subdomains mask redirecting to a specific directory. Eg teste.meusite.com.br will always point to `/pulic_html/project_folder` When I type the address: http://teste.meusite.com.br/project_folder \application\controllers\home the appl...

php

El'endia Starman

7:28 PM

Still astounds me how people end up here when they want Stack Overflow.

3

Cᴏɴᴏʀ O'Bʀɪᴇɴ

How to find the nineteenth byte and find its original value

muddyfish

Is there a way for close-voters to flag for migration instead/as well as?

El'endia Starman

Not until we're out of Beta.

Dennis

Not that it would ever be needed.

El'endia Starman

Mods can migrate them, but the general rule is "Don't migrate crap."

In any case, it's better for those people to learn the right site to ask questions on. :P

muddyfish

7:31 PM

Then why do we ask them to ask on SO?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

SO what?

hahahaha

El'endia Starman

SO they go there.

muddyfish

but don't migrate crap?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

my SO is SO?

El'endia Starman

@muddyfish Preferably, SO mods will be mad at the user that posts crap, not the user that posts crap and the people who migrated it there. :P

Dennis

7:35 PM

@muddyfish That's why we usually leave a comment in addition to the default close text, suggesting they read the help center first. In exceptional cases, I have voted to close with a custom reason to avoid the link to SO.

muddyfish

ok

trichoplax

@El'endiaStarman I think some people don't realise there are separate sites within Stack Exchange, and just think it's all one thing. I had to explain recently why computer-graphics is not available as a tag on Computer Graphics...

Dennis

@Downgoat @Adnan Please do not vote to delete spam. If the Community user deletes it because of spam flags, the post is automatically edited and locked. That does not happen if you manage to delete it by conventional means.

El'endia Starman

@Dennis Why is that a problem on this site?

Doorknob

SpamRam

Deleting "manually" doesn't feed spam posts into SpamRam, while flags do

trichoplax

7:42 PM

Hah! stack-overflow is a tag on Stack Overflow

Dennis

@El'endiaStarman Because the spam is still visible to 2k+ users and because the system won't recognize the spammer's IP as such.

orlp

YOYO

El'endia Starman

Oh, so, don't VTD spam, but flag as spam?

orlp

YOU ONLY YOYO ONCE

5

El'endia Starman

@orlp MA

Doorknob

7:43 PM

@El'endiaStarman yep

Even if you're a mod. (In which case you have a "binding" spam flag)

El'endia Starman

That's what I'd do anyway. Excellent.

Oh yes, I know, I love flagging spam on C.SE. :P

Dennis

Yes. Six spam flags don't just delete, they purge.

Doorknob

Read-only!

Dennis

Again? ;-;

Doorknob

If Nick's tweets are accurate, it shouldn't last long

trichoplax

7:45 PM

@El'endiaStarman I went away to search in case anyone had already created cellular automata for which the rules dynamically spread from cell to cell, and instead I found this - cellular automata where the topology of the grid changes dynamically. I don't pretend to understand the paper but I thought you might be interested in the concept.

El'endia Starman

@trichoplax Papers are rarely understandable but that's cool!

trichoplax

The pictures at the end do a good job of showing the neighbours of the cells changing each step

El'endia Starman

I have had the idea of Life-like rules on arbitrary graphs.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman Do you get a lot of spam over there?

Uhhh

sorry, emote keyboard

Martin Büttner

@El'endiaStarman so a bit like Calvin's challenge I guess?

(except that it was limited to tilings)

Dennis

7:47 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ flags as spam

El'endia Starman

@MartinBüttner Yes, but potentially even more arbitrary.

Martin Büttner

yeah, right

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Dennis (」゜ロ゜)」

El'endia Starman

The conceptual block I came up against was the best way to draw the graphs + voronoi-ish cells.

trichoplax

@El'endiaStarman Yes this is like that - with that added arbitrariness that the neighbourhood of each cell changes each step

El'endia Starman

7:48 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ Not a lot, but occasionally.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Ah, I see.

El'endia Starman

@trichoplax That's cool.

So the CA simulator to simulate all CAs would have the following features: 1) multiple states, 2) rule mixing, 3) topological changes, 4) arbitrary underlying graph, 5) rule spreading, and 6) probably a few more.

Martin Büttner

you could add my/Sp's idea of bitwise CAs I mentioned a while ago ;)

trichoplax

@El'endiaStarman Depends how practically useful you want this simulator to be. If you just want it to technically work, you can simulate it all in Game of Life :)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

What does CA mean, again? :/

El'endia Starman

7:50 PM

@MartinBüttner Remind me again what that was?

Oh, also, arbitrary neighborhoods.

@CᴏɴᴏʀO'Bʀɪᴇɴ Cellular automaton.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Oh, duh. :|

Martin Büttner

@El'endiaStarman Basically, you add an additional semi-infinite dimension to each cell, and interpret that column of bits on top of your original cell as the bits of an arbitrary-precision integer.

El'endia Starman

So...history-related?

Martin Büttner

ummm? no?

PhiNotPi

I'm only here because read-only

Martin Büttner

7:53 PM

@PhiNotPi read-only is over, you can leave again.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@PhiNotPi stay with ussss

El'endia Starman

@MartinBüttner Okay, I don't understand yet.

Martin Büttner

okay, simple example...

PhiNotPi

That was fast.

Martin Büttner

take a semi-infinite 2D grid (e.g. all cells with non-negative y)... that boundary could be assumed dead or living.

you can define any 2D cellular automaton on that grid as you'd normally do.

El'endia Starman

7:55 PM

Okay, first, what the heck do you mean by "semi-infinite"!? :P

Martin Büttner

well only half the infinite plane

El'endia Starman

ohh, okay

Cᴏɴᴏʀ O'Bʀɪᴇɴ

ugh windows sucks

Martin Büttner

following up on "you can define any 2D cellular automaton on that grid as you'd normally do." ... but you could interpret each column as the bits of an arbitrary-precision integer, such that your grid actually represents a 1D infinite list of integers.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

the windows "help" prompt I accidentally opened up was using 50% CPU

Martin Büttner

7:57 PM

so this is how you could define rule-based CAs for an infinite number of states in 1D.

El'endia Starman

Hmmm, that's intriguing.

Martin Büttner

but if you turn it around, the extension is simply to extend each cell in your 1D array to a semi-infinite column of cells (which are adjacent to the same bit on adjacent integers, as well as the previous and next bit in the current integer)

so this could easily be applied to any topology.

in particular, it could create Turing-complete CAs on a finite number of cells but with an infinite number of states.

New Main Posts

0

Q: Implement the divisibility-by-7 rule

To check whether a decimal number is divisible by 7: Erase the last digit. Multiply it by 2 and subtract from what is left. If the result is divisible by 7, the original number is divisible by 7. (also described e.g. here) This rule is good for manual divisibility check. For example: I...

code-golf number-theory division

Optimizer

WE ONLY GRADUATE NEVER

quartata

Oh boy I see I missed a lot of questions

RikerW

8:09 PM

Have we graduated yet?

quartata

@RikerW Ha. No.

RikerW

Aw.

quartata

@MartinBüttner I just saw your comment on my sandbox post. I had thought about giving the URL as input, but that felt... clumsy... to me. I do need some way to factor the bytes spent on the URL out -- I don't want people gaining an edge over other people just because they compressed the URL better.

I guess I'll just give the URL as input.

Martin Büttner

yeah and I think giving it on input is a fairly elegant solution to that

quartata

k done

Seems to be the best solution.

RikerW

8:13 PM

^

quartata

We haven't had a lot of internet challenges so I'm not sure how that is usually handled

RikerW

Maybe offer optional as input?

quartata

??

RikerW

Just for compatibility, allow it to not be taken as input and hardcoded in.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

^^

quartata

8:15 PM

One of those days.

trichoplax

What's all this whispering???

El'endia Starman

[views history of each deleted message]

quartata

@El'endiaStarman You didn't miss anything. :P

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman how do you do that? :|

RikerW

@El'endiaStarman ಠ_ಠ

quartata

8:15 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ He's a mod.

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ Got a diamond.

RikerW

^^

Cᴏɴᴏʀ O'Bʀɪᴇɴ

>_>

nothing is safe from the starman

quartata

Diamonds are cool like that

RikerW

:(

I WANT ONE

2

El'endia Starman

8:16 PM

:D

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Maybe if we take a whole bunch of us we can compact ourselves into a diamond

3

El'endia Starman

@RikerW ♦

muddyfish

♦

RikerW

I WANT A ONE THAT I CAN PUT AT THE END OF MY USERNAME

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I'll write a userscript.

RikerW

8:17 PM

Thanks

quartata

You actually can't put diamonds in your username for this reason.

RikerW

Exactly.

El'endia Starman

^^

trichoplax

@RikerW Find a proposed site on Area 51 and help it get to beta - then it'll need mods...

quartata

Although I'm not sure who'd fall for that...

El'endia Starman

8:17 PM

@quartata Fake diamonds? Probably a lot of people, actually.

RikerW

@trichoplax Good idea.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

♦ _ ♦

El'endia Starman

Exhibit A: the off-topic questions we get on PPCG all the time.

trichoplax

@El'endiaStarman Nobody's spotted mine yet...

RikerW

Thinking about joining CG later.

El'endia Starman

8:18 PM

@trichoplax Hahaha. Well, CG is a fairly new site...

muddyfish

I can't update my display name to have a ♦ at the end :(

trichoplax

@El'endiaStarman No I was joking about it being fake - people have commented on it :)

RikerW

I actually think this one is a good idea.

quartata

By the way

53

Wikis

Proposed Q&A site for users, administrators, and developers of collaboratively generated content, better known as wikis.

Currently in definition.

El'endia Starman

@trichoplax Wait, people thought your diamond was fake?

quartata

8:19 PM

I'd love to see this make it into beta

@El'endiaStarman haha what

CG isn't that new of a site...

RikerW

^

@quartata same

trichoplax

@El'endiaStarman Lol my joke has totally backfired. I meant that no one had noticed that my diamond is fake yet. Which it isn't. But no one was fooled so I wasted my time :)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

area51.stackexchange.com/proposals/95463/what-ifhypotheticals/…

El'endia Starman

@trichoplax Oh, okay. Thanks for clearing up the confusion. :P

RikerW

I understood it but thought it wasn't funny. Sorry. :P

trichoplax

8:21 PM

@El'endiaStarman Only fair since I caused it...

RikerW

@CᴏɴᴏʀO'Bʀɪᴇɴ AGH

ABOUT TO POST THAT MYSELF

trichoplax

@RikerW I agree. It was a poor attempt. :)

RikerW

WHY @CᴏɴᴏʀO'Bʀɪᴇɴ WHY

Cᴏɴᴏʀ O'Bʀɪᴇɴ

FGITWFTW

RikerW

sighs and upvotes

Cᴏɴᴏʀ O'Bʀɪᴇɴ

8:22 PM

Probably not the best idea to link before you write the question ;)

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ Oh goodness, I see primarily-opinion-based close votes being really common...

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman Yeah... shudders

quartata

That reminds me I had a question to ask on Worldbuilding

Cᴏɴᴏʀ O'Bʀɪᴇɴ

54

Q: Let's weaponize jellyfish

Jellyfish are... weird. They're clear, slimy, and can sting after death. Sounds perfect for experimentation, so lets weaponize them! Consider a hypothetical world where jellyfish are extremely common and you can get them cheaply anywhere, and there's an extreme fascination amongst the human popu...

science-based weapons sea-creatures

2

RikerW

Is "What would happen if human beings could explode on will?" a good WB/What if question? :P

El'endia Starman

8:26 PM

I have no idea what a good WB question is. :P

The only exposure I have is via HNQ. :P

muddyfish

^

RikerW

I browse but don't post.

area51.stackexchange.com/proposals/95463/what-ifhypotheticals/…

trichoplax

I posted a fair bit back in private and early public beta, but haven't been there much recently. I noticed they just graduated though...

RikerW

I just noticed they graduated!

Good job WB!

You didn't take as long as us... :P

El'endia Starman

It's harder to notice when sites graduate now that the design doesn't have to be made first. :P

RikerW

8:31 PM

^

muddyfish

^

trichoplax

I did find the lack of beta jumped out at me though

RikerW

Anime and Manga graduated 5 months ago and they haven't been revamped IDK.

Anybody here play bridge?

quartata

@RikerW Yes.

But the proposal was closed.

RikerW

Yeah, I know.

I was just wondering.

Dennis

8:36 PM

@MartinBüttner The only reasonable way was to compute the first 2 ** n states. That would probably be shorter in CJam as well.

RikerW

3

They forgot to include most golfed code as unreadable.

El'endia Starman

The one for LaTeX is my favorite. :P

RikerW

I know.

HTML is cool too.

trichoplax

Is the joke because anything can be parsed as HTML?

quartata

What's the complexity class of the best linear programming cutting-plane techniques? I couldn't find it anywhere. Man, the Garfield guy doesn't have these problems ...

El'endia Starman

8:45 PM

It might be more that HTML isn't really a programming language.

I don't know, though.

quartata

as long as we're posting dumb cartoons

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Yard sale: O(0)

trichoplax

@RikerW We should make an 8 panel comic like this with esolangs and golfing languages

@CᴏɴᴏʀO'Bʀɪᴇɴ Yard sale: O(1/n) - the more things you have, the faster they sell

quartata

@trichoplax that would be.... weird

trichoplax

:)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

8:49 PM

@trichoplax n is so large that it is trivial to count for a traveling salesman ;)

Martin Büttner

@Dennis oh, good idea

somebody

eoslangs? there are to many of those to choose

*esolangs

Optimizer

5

(•_•) / ( •_•)>⌐■-■ / (⌐■_■)

somebody

but your username isn't changed later, it's Changed Later

quartata

totally haven't seen that one before

trichoplax

8:51 PM

@somebody There aren't only 8 conventional languages either :P

somebody

*whoever that is's username

but there are not too many golfing languages

Optimizer

wut?

say whaaat

somebody

@Optimizer ?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

3

A: Sandbox for Proposed Challenges

code-challenge string Auto BATCH golfer. I love BATCH, despite its shocking lack of functional commands, despite even due to its lack of non-integer support. Why? Because this works: SET var=SET %var% i=0 This would evaluate to: SET var=SET SET i=0 Fantastic, isn't it? I've used this tech...

somebody

8 esolangs: Jelly - too short, CJam/Pyth - can't tell them apart sometimes, Retina - it uses regex, Mathematica - surprisingly short/surprisingly many builtins + some three random ones

Optimizer

8:55 PM

@somebody there are at least 20 golfing languages

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Is this ready for posting? ^^^

Optimizer

your shark?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

huhwat