The Nineteenth Byte

12:02 AM

0

Chain up the cops! Thanks to Magic Octopus Urn for the original idea! This is a combination between a answer-chaining and a cops-and-robbers challenge. Cops Your task is to create a program that, when run in language A outputs a program, that when run in language B outputs a program which run...

PhiNotPi

12:34 AM

Phigs

For discussion of this in-development golfing language.

Zacharý

Wait, waht does o do?

PhiNotPi

Output

Zacharý

It's supposed to be a golfing language and you don't have implicit IO? Don't go down the same road as MY

Especially since you know how to parse

Conor O'Brien

"it lives" not "it golfs"

HyperNeutrino

Proton takes a really long time to parse long strings for whatever reason...

github.com/alexander-liao/proton-2.0/blob/master/proton#L81

Conor O'Brien

12:42 AM

where are your qualifier functions defined?

HyperNeutrino

what is that o_O

PhiNotPi

Phigs> 6 8 *
48
Phigs> [6 7] 1 +
[7 8]

@Zacharý It does

Conor O'Brien

"OR", "ZERO_OR_MORE", "ANY_EXCEPT"

Zacharý

@ConorO'Brien I might want to use modgrammar eventually.

Conor O'Brien

I mean honestly that type of parsing is only useful for complex scenarios, and then you could probably write a parser compiler to make it faster

(or just write your own parser :P)

Zacharý

12:46 AM

@ConorO'Brien ._.

HyperNeutrino

last time I tried it was horrible

they are defined by modgrammar

Conor O'Brien

so I spoke without knowing what modgrammar, so that code was generated by modgrammar?

H.PWiz

@HyperNeutrino How long?

HyperNeutrino

like, 3 seconds for a length 16 or so string

H.PWiz

How does it scale, linearly?

HyperNeutrino

12:49 AM

@ConorO'Brien Yeah, OR, ZERO_OR_MORE, and ANY_EXCEPT are defined by modgrammar.

Conor O'Brien

it's probably backtracking

HyperNeutrino

@H.PWiz seemingly exponentially

H.PWiz

oh God

Conor O'Brien

@HyperNeutrino how long does it take when you do a plain ANY_EXCEPT("\"") instead of the alternation?

HyperNeutrino

becomes instant for like length 50

basically instant

Conor O'Brien

12:51 AM

what exactly is OR doing? o_O

I think my suspicion was right, it seems to be doing some backtracking

that would explain the exponential runtime at least

HyperNeutrino

hm ok. The OR just allows for backslash escapes, and the larger OR is for 'single' and "double" quoted strings

PhiNotPi

1:07 AM

@Mr.Xcoder CMC: compress this list of palindromic primes.

Pavel

For[i = 1, True, i++, Echo@{"", Prime@i}[[1 + Boole@PalindromeQ@Prime@i]]]

Hmm, the supplied Mathematica implementation at OEIS seems to be overcomplicated

It even implements PalindromeQ from scratch

Zacharý

0/10, not golfed

Conor O'Brien

@Pavel which language is that?

Pavel

@ConorO'Brien Mathematica

Conor O'Brien

huh

Pavel

1:16 AM

@Zacharý Mathematica inserts spaces automatically when you copy from there

Zacharý

o.O

Conor O'Brien

Palindromic\Primes[2083] in Attache. Mathematica++ :P

Pavel

@ConorO'Brien What's 2083 doing?

Conor O'Brien

first 2083 primes

18181 is the 2083rd prime

Pavel

Prime@Range@2083~Select~PalindromeQ, because for some reason you can't index into Primes, only check for membership.

HyperNeutrino

1:19 AM

any tips on making my parser work slightly more quickly than exponential time for strings :P

it works fine when I take the string grammar out and test it on its own which suggests to me that a higher level grammar is backtracking

Conor O'Brien

@HyperNeutrino can you replicate the exponential time behavior for something other than strings?

@Pavel is ~ sort of like a pipeline?

HyperNeutrino

I can't seem to...

Pavel

@ConorO'Brien Infix. You can also do Select[Prime@Range@2083,PalindromeQ]

Conor O'Brien

oic

Pavel

And get `{2, 3, 5, 7, 11, 101, 131, 151, 181, 191, 313, 353, 373, 383, 727, \
757, 787, 797, 919, 929, 10301, 10501, 10601, 11311, 11411, 12421, \
12721, 12821, 13331, 13831, 13931, 14341, 14741, 15451, 15551, 16061, \
16361, 16561, 16661, 17471, 17971, 18181}`

(Forgot Mathematica inserts lineberaks for you too)

Conor O'Brien

1:23 AM

so @ is function composition, does it treat 2083 as a zero-arg function?

Pavel

No, @ is function application

Expands to Prime[Range[2083]]

Conor O'Brien

oh, so @ is a bit like a pipeline then

totallyhuman

a reverse pipe

Pavel

@totallyhuman F# calls it a backpipe, but really, it's the apply operator.

totallyhuman

same thing :P

Conor O'Brien

1:25 AM

are F#'s backpipes also right-associative?

Pavel

Right. That's their entire purpose.

Conor O'Brien

that makes sense

Pavel

Apply is left-associative though

HyperNeutrino

wait so is a ~ b ~ c ~ d ~ e meant to be d(b(a, c), e) or b(a, d(c, e))

totallyhuman

that's up to you to figure out :P

Pavel

1:27 AM

d[b[a, c], e]

@HyperNeutrino Mathematica says ^

Conor O'Brien

@Pavel wait how? if it was wouldn't Prime@Range@2083 be (Prime@Range)@2083 = Prime[Range][2083]?

Pavel

@ConorO'Brien I misspoke. It's right associative, it just has really high precedence.

Conor O'Brien

oh ok cool

Pavel

As apposed to the backpipe which has the lowest precedence

Oh no. @ isn't called the Apply operator. It's the Prefix operator. The Apply operators are @@ and @@@.

Conor O'Brien

ohh I thought @@ was function composition instead of @*, haha

Pavel

1:30 AM

I call @ the apply operator, @@ the splatting apply operator, and @@@ the doubly splatting apply operator.

totallyhuman

apply, doubly apply, triply apply?

lines up with the amount of @s

HyperNeutrino

ok good

Conor O'Brien

@Pavel the closest equivalent in attache would be Select[Palindromic,Prime!1&Range!2083], it's about the same, except Prime is 1-indexed

Ørjan Johansen

@HyperNeutrino I see one bug, the ANY_EXCEPTs should really exclude `\\` as well.

Conor O'Brien

a `\ `b

Ørjan Johansen

1:44 AM

Why does the chat have a different markdown flavor. :(

testing

Conor O'Brien

because chat is weird

you can test here

ETHproductions

Feb 1 at 21:18, by caird coinheringaahing

I'm coining it. The TNB link effect: Someone links to a room, and at least 5 people more than intended go into the room at once.

Zacharý

How many times has that been brought up, Ð?

ETHproductions

no idea, I don't follow this room 24/7 anymore

Conor O'Brien

@ETHproductions yup XD

Zacharý

1:51 AM

@ETHproductions yup

Pavel

@ConorO'Brien Mathematica's Prime is also one indexed

As is its Range

Conor O'Brien

ah, Attache's range is 0 indexed

Pavel

Mathematica is 1-indexed, although oddly enough you can index into any object to get it's type at index 0.

HyperNeutrino

@ØrjanJohansen i feel like that's why it's so slow o_O i'll see if fixing that makes it faster

Ørjan Johansen

Well if the parsing framework is slightly smart it should only matter if the string contains lots of \ s, and if it isn't you would get backtracking anyway. I think.

Zacharý

2:00 AM

Having the option for either one is best.

Ørjan Johansen

But it's still a bug, because it can cause the string to end in the wrong place.

If the first alternative is tried first, then "\"" would do so.

HyperNeutrino

ok I fixed that though it still doesn't make it any faster. oddly enough, just the string code on its own is fine: TIO

Ørjan Johansen

What happens if you disable the string code?

Christopher

2:17 AM

Stuff breaks

Avacado strikes again instagram.com/p/Bb91CvfFcIQ

caps lock :P

Ørjan Johansen

@HyperNeutrino What happens if you switch IndexAccess and Value in FunctionAtCall?

(That's not a fix, just a test)

Pavel

@Christopher That's actually terrible. Why would you expose more people to that.

Christopher

@Pavel Because this is avacado land

Ørjan Johansen

@HyperNeutrino I think the reason why the string code alone works is that it then just takes the first parse that works, which is usually fast (especially after fixing the first bug I found)

HyperNeutrino

@ØrjanJohansen (before I do it) my prediction is that it will just cause index accesses to not work because IndexAccess is a subset of Value (after I do it) wtf that worked

> not a fix just a test

well you somehow managed to fix it o_O

thanks :D

Ørjan Johansen

2:31 AM

But as soon as you have something that can fail afterwards, it's exponential to backtrack out of the string.

HyperNeutrino

hm ok

Ørjan Johansen

@HyperNeutrino I think now index accesses with strings will blow up.

Christopher

What is going on

Conor O'Brien

@Christopher we're trying to optimize HN's language because it takes a long time to parse strings

HyperNeutrino

actually, no it doesn't. (I mean, it fails, but that's because I didn't fix the behavior of index accessing in the interpreter part yet, and so the failure is as expected)

Christopher

2:33 AM

@ConorO'Brien kool

Ørjan Johansen

Well if it ends up exponential after the fix you can refactor that as (Value, OPTIONAL ( ...index stuff...)).

HyperNeutrino

it seems to run instantly now by swapping the order, though I discovered a new issue when testing but that's another thing

but the strings taking a long time thing seems to be fixed, thanks!

Ørjan Johansen

As long as the rest of the grammar never requires backtracking once you've started parsing a string, it should work. But I wouldn't guarantee that.

And you're going to take exponential time again if you ever have an actual parse error after the string literal.

Parser combinators really need a way to commit to a choice to prevent this sort of stuff.

HyperNeutrino

Oh I get it, IndexAccess fails because there's no [ so it backtracks the entire thing. Hm :/

Christopher

Why don't u just use regex

HyperNeutrino

2:41 AM

One of Proton 2.0's goals was "avoid using regex for the parser"

Conor O'Brien

because regex also does backtracking/isn't good/smart enough

HyperNeutrino

I haven't even imported the re module for Proton :D

also regex is no smarter than modgrammar and modgrammar is way nicer to use and also faster

Christopher

It was joketh

HyperNeutrino

;-;

Conor O'Brien

regex is no laughing matter. it's a matter of life and death. (hides regex-based parsers)

Zacharý

2:43 AM

JokETHPRODUCTIONS?

HyperNeutrino

I mean modgrammar is in some ways extremely similar to regex. almost every parser i've seen (for languages that have a concept of a parse tree, so not including things like 05ab1e) is regex-based

Positron's parser is nowhere near resemblance to regex though :P

it's somehow worse

Zacharý

Are you keeping Positron and Proton?

HyperNeutrino

well I'm not taking them down from GH but I'm not working on them any more

especially not positron

its parser is so broken that it's almost funny

I mean just look at this madness

Zacharý

So Proton/Proton2 is à la Perl/Perl6?

HyperNeutrino

the advantage to it is that it doesn't require lookahead. You can feed it tokens one at a time

@Zacharý sure I guess

Zacharý

2:50 AM

Je juste aime les mots "à la" :p

Conor O'Brien

oo parlons-nous francais?

Zacharý

Oui, un peu

HyperNeutrino

Je pense qu'on ne peut pas utiliser <<juste>> comme ca, mais jnsp

Conor O'Brien

@Zacharý ç'est ton langage naturel ou tu l'appris en école ?

Zacharý

<<un peu>>. L'anglais est mon langue naturel.

Conor O'Brien

2:53 AM

@HyperNeutrino oui, on échange l'ordre de les deux mots <<aime>> et <<juste>>

Zacharý

Le Dix-Neuvième byte?

Conor O'Brien

ouaip, je l'oublie juste.

HyperNeutrino

mais ne dirais-il pas <<I love just the words...>> comme il dit qu'il n'aime pas les autres mots?

HyperNeutrino

3:08 AM

CMP: For Proton 2.0, I'm adding a value!! expression much like in Kotlin where it errors if value is null (in this case, None). How tightly should it bind? I'm thinking maybe more loosely than a#b but more tightly than a**b.

Conor O'Brien

what's a#b?

HyperNeutrino

a#b#c... == a[b][c]...

Conor O'Brien

@HyperNeutrino that sounds about right

ETHproductions

@HyperNeutrino I am strangely attracted to this feature

Conor O'Brien

@ETHproductions it's similar to a feature in J, c{b{a is equivalent. I do like infix element accessing, it seems very convenient

Zacharý

3:21 AM

BLECH, J

Christopher

@Dennis wouldn't the answer in HTML still be invalid? HTML is not a programming language and cannot be used on its own right?

Conor O'Brien

@Zacharý blech, unicode characters e_e

Zacharý

Fortress does it best. You can use Unicode and/or ASCII

ETHproductions

tfw you get most of the way through writing an explanation and then realize you could save 2 bytes by completely rearranging your answer...

Conor O'Brien

@Zacharý it's one or the other! xor supreme!

Zacharý

3:23 AM

@ConorO'Brien ... y u no use !=

Conor O'Brien

logic gates!

Try it online!

Dennis

@Christopher You don't need to use a programming language in Kolmogorov complexity challenges...

Christopher

@Dennis woops

I still downvoted it because it kinda sucks as an answer, no effort

Conor O'Brien

@Dennis I thought that if the "language" satisfies the challenge and has an interpreter, it's valid, right?

Dennis

For KC, yes. I don't think there's a clear consensus right now for everything else.

HyperNeutrino

3:28 AM

The reason I have infix function call and array access is so I can do things like map(array&(#),indices) :D

Conor O'Brien

@HyperNeutrino or you could make array access vectorize so you could do array#indices

HyperNeutrino

@ConorO'Brien a[x, y] == a[x][y] based on user requests.

Conor O'Brien

e_e

wait that still doesn't define a[[x,y]]

HyperNeutrino

hm true

ETHproductions

do what JS does and just return a[str([x,y])]

:P

HyperNeutrino

3:35 AM

uh wtf

please

i want people to actually want to use my language

:P

ETHproductions

maybe throw an error? idk why you'd want to be using an array as a property id

HyperNeutrino

i was thinking to vectorize it

proton 1.0 does that with a[x, y] but users (i.e. Pavel) want it as a[x][y] so I'm going to do that because it also makes sense :p

CMP: a[(x, y)] == a[x, y] == a[x][y] or a[(x, y)] == (a[x], a[y])?

Conor O'Brien

#2

ETHproductions

#2

same goes for a[[x,y]] I guess

Conor O'Brien

e.g.: inds = a.indices(e -> e is even); a[inds] would be an array of even numbers

   0 2 3 { 1 2 3 4 5
1 3 4

Dennis

3:40 AM

As a C programmer, I'd expect a[(x, y)] == (x, y)[a]. :P

HyperNeutrino

wtf

Conor O'Brien

@Dennis ah yes, the classic address identity lol

HyperNeutrino

how does

wat ._.

ETHproductions

@HyperNeutrino relevant SO question

HyperNeutrino

thx

Zacharý

3:46 AM

THat feeling when you write more French in PPCG than you do in French class

Conor O'Brien

@Zacharý right??

HyperNeutrino

last year i'd have to spend like a minute translating each sentence and now i can just read it and understand most of it on the first run (minus some words not in my vocabulary that i have to infer)

it's great :D

Zacharý

Our teacher tries to make it so we don't have to go through and translate it. I think that's how I would describe it

HyperNeutrino

yeah basically. my grade 9 french teacher spoke too much english in class and was in some sense too nice to the people falling behind? idk it's hard to explain, she was a good teacher though. this year the teacher spoke almost entirely french and at first she used really simple vocabulary and then gradually just sped up and used harder words and nobody even really thought much about it until she was like

"look at you guys, it's only been six weeks and i can just speak to you in french and you all understand it"

brb

Zacharý

@HyperNeutrino Was that in french?

mudkip201

4:02 AM

@Zacharý yeah. iirc, the way you know you really know a language is when you think in it instead of having to translate

Zacharý

Do you have the same French class?

I was asking if she said that in French

mudkip201

I took Spanish in middle and high school

Zacharý

Normy

mudkip201

¡Cállate!

:P

tbh, French always looked like a p.i.t.a. when it was written out. WHERE THE FUCK ARE ALL THESE EXTRA LETTERS COMING FROM

HyperNeutrino

@Zacharý no, that was one of the few things she said in english. she only says stuff when it's of particular importance and it's important that everyone understands it the way she intends

Zacharý

4:05 AM

I almost responded in French ._.

mudkip201

pat pat

Conor O'Brien

@mudkip201 What are you talking about? "elles créées" is a perfect way to represent "they created"

mudkip201

...

@ConorO'Brien I meant the silent letters at the end of words

HyperNeutrino

@Zacharý mdr (:P)

Conor O'Brien

@mudkip201 "ils haïssent" :)

mudkip201

4:07 AM

@ConorO'Brien but 'ai', 'aie', 'aient', 'aies', 'ait', 'es', 'est', and 'et' are all pronounced the same

HyperNeutrino

@ConorO'Brien wouldn't it be elles a creees

mudkip201

@ConorO'Brien I dun speak French

Conor O'Brien

@mudkip201 homophones aren't unique to french :P

mudkip201

well, duh

Zacharý

@mudkip201 Could be worse: ENGLISH

HyperNeutrino

4:08 AM

@mudkip201 actually ai and et are pronounced the same and the rest are pronounced the same as each other but different from the aforementioned

Zacharý

French's rules are somwhat regular, at least

mudkip201

@Zacharý eh, I blame the French for that

HyperNeutrino

at least french has consistent rules. in english there are approximately 0 rules that always hold

Conor O'Brien

@HyperNeutrino well yeah I forgot the participle but that's the gist

HyperNeutrino

other than "a word always has letters in it"

o ok yeah

ETHproductions

4:09 AM

I don't know French, but my rule of thumb when it comes to pronouncing French words is to just drop all trailing consonants :P

HyperNeutrino

participle or auxiliary? my teacher always calls it the latter

ETHproductions

How often does this actually work?

Zacharý

@mudkip201 ITZ TEH VAWEHL SHEEFT

@HyperNeutrino Either or.

Conor O'Brien

@ETHproductions almost all of the time actually, but it doesn't cover everything

HyperNeutrino

ok

Zacharý

4:10 AM

You have to be CAREFUL... mdr

Conor O'Brien

@HyperNeutrino auxilary is the "helping verb", participle is about the same sometimes

HyperNeutrino

hm okay i see

Οurous

How useful is unary negation when you've already got bitwise negation, and subtraction / addition, etc?

ETHproductions

In a golfing lang? Very useful

Zacharý

Well, you could have special cases for non-booleans, so possibly VERY useful

Ninja'd

ETHproductions

4:15 AM

much better than having to do 0- or similar every time

Zacharý

That was the most French I've written in FOREVER

PhiNotPi

Je ne comprehend very much French pas.

Zacharý

Chiac-esque, mdr

PhiNotPi

Even though I do actually need to sit down and study it sometime.

Zacharý

4:29 AM

Yeah. I would've taken German if our school offered it. But we're in the middle of nowhere.

New Main Posts

1

Q: Tips for golfing Yabasic

Yabasic, or Yet Another Basic is a dialect of BASIC created by Marc-Oliver Ihm that may be run on Windows, Unix and PAL versions of the Sony PlayStation 2. Development for this language is ongoing. Some Yabasic Official Website Yabasic Manual Yabasic Wikipedia Page Yabas...

user202729

4:50 AM

Can anyone try viewing the TPLQ snippet? My browser crashed twice...

tfbninja

If I award this bounty, will it stay featured for the full 7 days?

Anonymous

@tfbninja No. Challenges are only featured while the bounty is posted but not awarded

tfbninja

@Mego dang

thanks

Esolanging Fruit

@tfbninja Thanks for the bounty, by the way. I'm still surprised that solution ended up safe...

tfbninja

Yeah I'm surprised anyone got a safe answer

New Main Posts

4:53 AM

0

Q: Tips for golfing Yeep

Yeep was originally developed back in 2015 by a Swedish programmer. Yeep was used once by an APL programmer, and then never again by that same programmer. Yeep can be compiled to any language, although the commonly accepted standard is to assembly (then to binary). Its only been successfully r...

tips

Οurous

builtin for e^<something>, useful?

Anonymous

@Οurous Very

Οurous

Noted

Zacharý

Wait, was one safe?!

Ørjan Johansen

Its utility is exponential.

Zacharý

5:02 AM

People can definitely do better than ~300 bytes. MY MY cop lasted ~1 day, and I made the language

Οurous

5:44 AM

Are reverses of every comparison operator useful? Or does that waste space

Esolanging Fruit

5:55 AM

@Οurous Not an answer to the question, but what language are you designing?

betseg

What's the font of the text at the bottom of the original JHT ad? It's kerning looks so good if that wasn't made just for the ad.

Οurous

@EsolangingFruit Two-Dimensional, Lazily-Evaluated, Brainfuck-Inspired-But-Not-Related, Loop-Interleaving, Stack-Based general purpose language.

Esolanging Fruit

TDLEBIBNRLISBGPL?

Οurous

Implemented in Clean, so I'm calling it Dirty

But I like that. Dirty: a TDLEBIBNRLISBGP language.

Esolanging Fruit

Make it compile to Clean and call the compiler Janitor.

4

Οurous

6:05 AM

@EsolangingFruit I'll put that on the todo list.

Esolanging Fruit

The charset has a lot of boxes for me :(

Οurous

Huh. The current charset (cs_mapping) doesn't have any boxed for me in Chrome.

I've been trying to replace ones that aren't widely supported with good equivalents, can you paste which ones are boxes so I can have a look?

Oh, yeah, forgot to @EsolangingFruit ^

Esolanging Fruit

6:21 AM

@Οurous ⏻⏵⏴⏶⏷⭪⭫⭬⭭⭮⭯⮕⭤⭥⭢⭡⭣⭠⭦⭧⭨⭩⭰⭱⭲⭶⭷⭸⭹⮒⮓

That looks like nonsense to me :P

Οurous

@EsolangingFruit should be that ^

New Main Posts

0

Q: How to get funny t shirt?

From few days I'm looking for some customized shirt for me and my friend's circle. We are planning to go for fishing in a reputed lake there will heald a fishing competition. So we need some quality full shirt that meet our required. One of my friends suggested me this eamazongo.com particular si...

math

Esolanging Fruit

This is a Good Comment™:

Οurous

It is indeed a good comment.

@EsolangingFruit Sadly, other than the triangles and the rotation circles, most of them don't have applicable unicode replacements

Esolanging Fruit

Clearly, the character set should be encoded not with Unicode, but with TeX.

That way all the fancy symbols can render the same for everyone.

Only downside is that it's a horrible idea.

Οurous

6:33 AM

@EsolangingFruit ... Hmmmmmm. I'll put that on the todo list as well. In addition to a native byte mode, and a UTF8 mode, a TeX mode.

Esolanging Fruit

Don't actually use TeX, though, unless you want some idiot (read:me) hanging your parser

Just borrow the sequence names.

Οurous

@EsolangingFruit Ooh. I can do the same with HTML entities too. That's only 3 translation front-ends, so it isn't too much work either.

Esolanging Fruit

@Οurous If I were to design a golflang, I'd drop the Unicode entirely. Allow mix-and-matching TeX, HTML, and printable ASCII where possible

Οurous

@EsolangingFruit TBH, I may end up with that. It was just the easiest way to get a compendium of different symbols to pick from. Now that I kinda know what the commands look like, (still might drop some of the mirrored comparisons), any symbol set that can represent them works.

Destructible Lemon

6:54 AM

@Οurous thx

@EsolangingFruit thx

New Main Posts

0

Q: Tips for golfing in Visual Basic

This page is not for Visual Basic .NET Tips Visual Basic (VB) is an object-oriented and event-driven dialect of basic that was developed and released by Microsoft in 1991. The last release of Visual Basic came as Visual Basic 6.0 in 1998, and the language was declared a legacy language in 2008...

tips basic visual-basic

0

Q: Tips for golfing in Visual Basic .NET

This page is not for Visual Basic Tips Visual Basic .NET (VB.NET) is an multi-paradigm dialect of basic that was developed and released by Microsoft in 2002 as a replacement for Visual Basic. The current version of VB.Net as of Feb 2018 is Visual Basic .NET 15.0. Unlike Visual Basic (VB), Vi...

tips basic visual-basic

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Do I Have Honors? code-golf card-games In contract bridge, once a contract is reached and the demonination is determined (one of the standard card suits or No Trump), a player is awarded bonus points if they have several guaranteed winning cards in their hand. This bonus is called honors. A p...

Pavel

7:21 AM

Are the Fedora repos down for anyone else? dnf update isn't working for me and I'm hoping it's not something wrong on my end.

New Main Posts

9:22 AM

0

Q: Local periods of strings

Local periods Take a non-empty string s. The local period of s at index i is the smallest positive integer n such that for each 0 ≤ k < n, we have s[i+k] = s[i-n+k] whenever both sides are defined. Alternatively, it is the minimal length of a nonempty string w such that if the concatenation w w ...

code-golf string

user202729

So I'm trying to solve the following problem: Given a n*n matrix A of 0 and 1, find a vector x of length n of non-negative numbers, having sum 1, such that 'min(A x)' is maximized. Is there any simpler/more efficiient way to solve this than using the simplex algorithm?

New Main Posts

9:40 AM

0

Q: Biggest number challenge (Brainfuck)

This is a brainfuck version of Largest Number Printable, and this. Let's think about brainfuck interpreter such that, Has array that can be stretched left & right arbitrary large Each cell can contain arbitrary large integer Can contain negative integer too When the interpreter starts, ev...

code-challenge brainfuck

Giuseppe

@user202729 well any algorithm that solves a linear program will work, obviously, not just the simplex algorithm

user202729

10:00 AM

I mean, this one is a special case of the general LP problem so there may exists simpler alg.

lol

Is there a small usb speaker for raspberry pi

I'm too lazy to solder an I2C Amp to it

even audio hats must be soldered

It's not good for a tinkerer/programmer/student to be lazy, but I'm lazy anyway

Erik the Outgolfer

11:46 AM

smells like rotten spam already...

somebody trash that please!

Adám

@EriktheOutgolfer Spam hammered.

Erik the Outgolfer

@Adám but not trashed yet as you can see

wait, how do you "hammer" spam

Adám

@EriktheOutgolfer Not sure. As soon as I flagged it as spam it was removed.

@EriktheOutgolfer Cacheing?

Erik the Outgolfer

@Adám you were the sixth

@Adám I meant NMP's message above

Adám

@EriktheOutgolfer Ah, return of the sixth…

@EriktheOutgolfer Wait for a flood of mods.

Erik the Outgolfer

11:50 AM

ah you flagged it?

Adám

@EriktheOutgolfer Sure. It shouldn't be here. See?

Erik the Outgolfer

@Adám yeah, and as you can see you can't suspend NMP

btw how did that only need ~3 flags to get deleted instead of 5

Adám

@EriktheOutgolfer If somebody writes a message which gets flagged and then removed, does the user automatically get a suspension?

@EriktheOutgolfer I suspect ME removed it.

Erik the Outgolfer

@Adám if it gets removed because of 5 flags then yes, they get a 30-minute suspension

but I'm not sure how one could suspend a feed

Adám

@EriktheOutgolfer How do you know NMP can't get suspended. I mean, if it consistently misbehaves.

Erik the Outgolfer

11:53 AM

@Adám I guess because NMP doesn't do the posting, it's just a negative-ID profile used for feeds

Adám

I think the privileges order is problematic. We allow anyone to post questions, but they need 5 to upvote. If instead we didn't allow posting until the user had upvoted a couple of posts (questions or answers) that higher-rep users had subsequently also upvoted and that retained a positive score, then I think a lot of spam and low quality posts could be avoided. The idea is that newcomers learn what constitutes good posts before they can post.

Erik the Outgolfer

@Adám eh, that's really unavoidable, since the philosophy is for the ability to ask for knowledge to extend to everybody who can access stackexchange.com, stackoverflow.com, superuser.com, serverfault.com, askubuntu.com, stackapps.com and mathoverflow.net

but some forums have a mod queue for new users' posts until the users reach specific requirements

Adám

@EriktheOutgolfer We don't?

Erik the Outgolfer

@Adám no, we don't

but some other forums and q&a sites do

Adám

@EriktheOutgolfer We'll, my suggestion is kind of like an automated review queue.

Erik the Outgolfer

12:07 PM

@Adám uh, we already have that here

Adám

@EriktheOutgolfer That isn't automated, and it is reactive, not proactive.

Erik the Outgolfer

@Adám uh, I think first posts go there automatically, but maybe you mean that it should pass the review before getting posted?

Adám

@EriktheOutgolfer Yes. But even more. If a new user tries to post, the system will pop up and tell them to get a bit more familiar with the site before posting.

Erik the Outgolfer

@Adám there is also the "test period" model, where a new user has reduced privileges for a specific time period, and then there are two cases: 1) the user gets "accepted" and granted all privileges or 2) the user gets "rejected" and banned

in the second case, I would suggest all of their traces get deleted right away

New Sandboxed Posts

12:23 PM

1

A: Sandbox for Proposed Challenges

Counting polystrips Polystrips are a subset of polyominoes. Each piece has two ends (= square with only one neighbor) and body (=squares with exactly two neighbors). Holes are forbidden. Miroslav Vicher's Puzzles Pages For example, there are 30 free(*) heptastrips (polystrips with length 7). H...

user202729

12:50 PM

Actually "Anyone can ask" is by design.

Surely it generates some LQ questions (especially on SO) but that's by design, there is little we can do.

The rep whores are also problematic. If everyone agree to only answer good questions, we don't need to worry about bad questions.

(also for unknown reasons I also tend to post more 'also' or 'too' than necessary, too)

@user202729 (not really unknown, just bad habit)

Phigs

Transcript for