The Nineteenth Byte

4:26 PM

People should at least give some clue when they change their name...

@Dennis Let's make an effort to keep something called "reading the rules of a challenge before commenting on others' answers" up.

@Dennis that's good. I am

Do you think this is a dupe: code-golf - given a string, copy the input to the clipboard?

Q: I copied my password to the clipboard! Can you delete it?

Not that I know of, but closely related to this

83

Following the best security practices, I keep a plain text file with my passwords on my hard drive. In fact, I just copied and pasted one of them to access my PPCG account. In a lucid moment, I decide that the password should better not remain in the clipboard after its use. Since this happens t...

code-golf

A search for clipboard is:q closed:0 doesn't give any results that might be dupes.

4:33 PM

Great! Maybe I'll post it in the sandbox in about a week :))

trichoplax

Or post a rough outline in the sandbox now and look at the comments after a week...

However @LuisMendo it is too closely related... No it's not a good idea

I agree. Maybe add some variation to make if more different

@EriktheOutgolfer To be fair, overriding standard loopholes is quite rare.

@LuisMendo maybe something related to restricted source or sth else

4:36 PM

Or just paste from clipboard instead of copy into it

@CartManagerXD :(( I used to like that profile pic. That was pure Brain-Flak

That profile pic is still on GH AFAIK :))

@EriktheOutgolfer yeah, found it on Information Security

Is there any way to retract a delete vote?

I don't think so.

4:39 PM

I doubt so

Well, that's a good idea for a feature-request on meta.SE

@Dennis Well, I'm used to reading the challenge rules closely paying attention before voting to delete, commenting on, downvoting answers based on a false premise. Am I unique as a non-robo-*-voter?

Everyone makes mistakes, no matter how closely they pay attention. Errare humanum est.

Someone likes Latin @Dennis

@Dennis OFC, but what I meant is that I think I might have a different method of voting. Also, I think I'm less going-with-the-crowd than others (although I'm not bragging anything here).

@EriktheOutgolfer No, you're not the only one.

4:44 PM

Also, Latin quotes may make you sound more sophisticated than intended.

So are we disregarding that loophole for all answers? or just answers on that particular question.

That particular question, because the rules override it.

Is that because it is a catalog?

Usually catalogs override that particular loophole, although I'm not sure if it's the same for all catalogs.

I think there's no consensus on that, so if this is the case, then no, overriding must be explicit.

Man our loopholes really suck. They are all antiquated and a good deal of them are useless and some of them are even directly harmful.

4:53 PM

Well, if you believe that overriding a loophole in a specific case should be implied, make a discussion meta post. Just be sure to be clear (I can't find a dupe). :)

5:03 PM

CMC: determine if N has exactly one prime factor. N will always be a positive integer

Truthy: 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 19

Does anyone know how the review all time stats are ordered? I have been trying to figure it out for a while but it remains illusive.

Falsy: 1, 6, 10, 12, 14, 15, 18, 20

@DJMcMayhem Pyth, 2 bytes: P_.

!!SuperPrime, 0 bytes: .

@DJMcMayhem VTC: Dupe: Is this number a prime?

Its not a dupe

16 is not prime but its only prime factor is 2

^

5:07 PM

It has 4 prime factors: 2 2 2 2.

.... Are you just being overly pedantic for the fun of it? It has one unique prime factor

It should instead say if it has exactly one unique prime factor.

No it only has one prime factor

Well, prime factor can be defined as many things. Fixing CMC:

New Sandboxed Posts

0

May the 4th be with you! code-golfkolmogorov-complexityascii-art Note: This is a Star Wars Day challenge and, if posted, will only be posted on May 4th Happy Star Wars Day everyone! And because this is a code-golf site, we must tell the story of the incredible resistance of Martin Ender. The st...

5:09 PM

CMC: determine if N has exactly one unique prime factor. N will always be a positive integer

Jelly, 2 bytes: Æv.

I don't think the word unique adds anything

It's not recommended to answer your own challenges outright ;-)

It's not my own challenge, it's DJMcMayhem's challenge clarified.

@CartManagerXD 25 has the factor 5 present twice

but it only has one prime factor

5:12 PM

It has two. 5 and 5.

No you've counted 5 twice

Apparently.

So the challenge was unclear and I clarified it.

@JanDvorak In octave, factor(25) gives 5 5

I'm my opinion the challenge was perfectly clear to begin with

The fact that there's a dispute means that the challenge was unclear.

5:14 PM

Yeah - then you started refactoring it

the set of all prime factors of 25 has only one element thus it only has one prime factor

The challenge is clear. CartManager's proposed version is less clear.

@CartManagerXD it's a multiset, not a set.

That seems like a completely unjustified leap

It's not a leap. It's a possible interpretation of your proposed version of the challenge, and quite justified IMO.

We are all clear on what the challenge wants and this is turning into an argument. I'd rather not go on.

5:19 PM

@DJMcMayhem Octave, 36 bytes: @(x)x>1&length(unique(factor(x)))==1

@JanDvorak No, Erik did

@KritixiLithos Can save 1 byte by using <2 instead of ==1

5:39 PM

Is there a word that means negative of a prime? I know that negative integers aren't prime or composite by definition, but I'm curious if there's a negative equivalent for primality

Even better, is there a word that defines the set of all primes and their negatives? Like {2, -2, 3, -3, 5, ...}

Looks like a good question for ELU.SE.

You could try "prime integers".

more verbosely, "prime elements of the ring of integers"

` en.wikipedia.org/wiki/Prime_element

Except that primes are positive integers by definition, so specifying integer doesn't help a lot

Maybe there just isn't a word

"positive or negative primes"?

in the end you'll probably have to explain

I don't think that helps either, there are no negative primes. Maybe you mean "primes or their negatives".

5:48 PM

Yeah

@EriktheOutgolfer That's exactly what I said

positive or negative prime integers. Clear and pedant-friendly

Numbers with an prime absolute value

too contrived

too ungolfed

we need more golfing challenges for English

5:50 PM

{n:|n|in P}

Is that a fork bomb or something?

No its set builder notation

It reads the set of all n such that n is an element of the set of all primes

Unfortunately that's not a word.

I think the shortest possible unambiguous phrase would be "primes' negatives".

I don't think that is very unambiguous

That seems to imply {-2,-3,-5,-7,-11,...}

Yeah, that's what it should imply, although a more unambiguous phrase would be "prime ns' negatives".

5:54 PM

Isn't the set we are trying to get {2, -2, 3, -3, 5, ...}?

That's the second set we're trying to get. We're trying to get both I think.

For the other one, "ns that have prime abs-es" is one.

too contrived, though

I mean, clumsy

Oh, I found another one (although even more contrived): "ns having prime abs-es".

flatMap(n->[-n,n])primes

What language is this in?

6:01 PM

That's not much different than what cart manager said

primes>>=n->[-n,n]

In what language a>>=b is a shortcut for flatMap(b)a?

I'm guessing Ruby

>>= is monadic composition, and lists are monads

wsbltc

@MartinEnder @Dennis I have a question in the sandbox that DJMcMayhem recommended that I check with you if it's ok. Can you check it out? Thanks.

Q: 4 to 1 multiplexor on logic layer in logisim

6:04 PM

0

I want to substitute a 4 to 1 multiplexor in logisim which should consist only out of logic gates. I already have the substitution but something does not work with the connection. I got a single wire which comes from the controller and which is a 2-bit wide bus. But when I want to "re-split" it ...

logic-gates logic

^ That is not a question for SO and I don't know why people are VTCing it as such

I haven't. Of course it isn't for SO.

Most of the general programming questions aren't good for SO.

That is not a general programming question

true

but just adding objective winning criteria won't save it either

6:13 PM

I think with some explanation and an objective winning criterion it would be fine to be reopened

I think it's discouraged for non-OP to add a winning criterion.

However the OP is probably just looking for help and doesn't want to make a PPCG question

Indeed

6:25 PM

Question: can I golf something like: a >= 1 ? 1 : 0 with only min/max functions?

a is an integer?

yes

In that case max(0,min(a,1))

If a is a positive integer it is just min(1,a)

@CartManagerXD oh, yeah duh >_> I was using max, not sure what I was thinking

D: same byte counts

... unless you use a different language

6:32 PM

Yeah, in Jelly that is «1»0 as an indexed link or «1$0»$$ as an inline link.

@Downgoat Sign?

Unless it might be negative. :shrug:

If it's negative then it can be shortened to 0.

It's 0⌈1∘⌊ in Dyalog APL as a train (or a fork, I'm not sure what it's exactly called)

quartata

@DJMcMayhem presumably not necessarily an integer

10 mins ago, by Downgoat

yes

6:41 PM

CMC: Similar to @Downgoat 's question make a function only out of min, max and number literals that performs ` a >= 1 ? 1 : 0 ` for the reals.

@CartManagerXD Dyalog APL, 5 bytes: 0⌈1∘⌊

code-golf string restricted-source hello-world

-3

Q: Hello... eh, who?

Introduction You started to write a "Hello, World!" program, but after you wrote the part to print the hello, you forgot what your program should actually print. So now, you somehow managed it to write a program which can check if the entered word is what you search. The task Your task is to w...

Dyadic ⌈ is max while dyadic ⌊ is min

@KritixiLithos Its not a code-golf

I also don't think this works

Why? It calculates min(1,right_arg) first, then does max(0,the_result)

6:45 PM

That won't work for .5

ah, real numbers

It is impossible

Again, using Jelly, an inline link would be <1$Ṇ$ while an indexed link would be <1Ṇ.

@CartManagerXD So no ==, subtraction, etc.?

7:02 PM

@Dennis Yeah that was the intention. However it is impossible

A possibly possible version permits adding real numbers to things. e.g. min(a,0)+1 is allowed but min(a,0)+max(a,6) or max(a,9)+a are still disallowed

^ +1 imaginary points to anyone that can solve or prove impossible the above challenge

Finally!

Q: adder in logisim on logic layer only with 2-input-nand gates

0

I want to build an adder in logisim only with 2-input-NAND gates. The adder consists of 2 inputs (1 x constant 1 and 1 x arbitrary number) and an output. The first thing which came into my mind is a 8-bit full adder but maybe there is an easier solution for this (because of the constant 1). Has...

logic-gates logic

min(n), max(n), n+ are all non-expanding maps on reals using their usual metric. Composition of non-expanding maps is a non-expanding map. The desired function is an expanding map.

You can also replace "non-expanding" with "continuous"

QED, twice.

the continuity argument also applies if you use two-argument min, max and addition

even if you also allow subtraction, multiplication and all sorts of other continuous functions.

7:21 PM

+1 imaginary points

7:33 PM

Please help defend the new PCG logo on pixelcanvas.io/@-44,35

I've fixed the C

user165474

Yay I have a power of 5 reputation :D

what 10 second limit? this is amazing

user165474

Someone's interfering with the background :(

do we have a template for the P?

7:37 PM

Its in the top corner of your browser isn't it?

@Riker It gets smaller as you get closer to 0,0

@Riker Should be this:

?

user165474

P is corrected

ah I see

7:38 PM

Also apparently they don't block Tor IP's ;)

I've noticed

:D

user165474

It won't let me place white tiles where they belong, but I can place them in the wrong spots if I want >_>

Hey could I get some feedback/testcases for this challenge:

3

The Image of the Dragon I saw a cool gif of the dragon curve made from a square, and thought what if we started from another base image. So I wrote a program to do this. It's so cool that I thought it would be fun to do it as a challenge. Task You wil...

@HyperNeutrino Try refreshing, it doesn't let you overwrite a tile with one of the same color

user165474

Oh okay. Yeah, it started working again after refreshing; I think I had an old version (as in it may not have been updating on time)

7:41 PM

that happens if you try to use both FF/chrome or similar

user165474

I see. I'm only using Chrome right now (well actually I left the page to go work on schoolwork like I should... xD)

I think at one time I had 12 instances of Tor Browser going, 4 per screen

user165474

>_>

user165474

I have 3 activities with 4 desktops each

user165474

I could make a lot more of each and get about 100 different thingythings

user165474

7:42 PM

Whatever they're called

user165474

Right, desktops.

7:56 PM

Ok I'm going to post my challenge now if no one has any objections

go for it

code-golf ascii-art geometry hexagonal-grid

0

Q: Hexagonal Triangles!

Your task: make a hexagonal triangle with side length n, where n is a positive whole number or 0. First, let me define a hexagon: / \ | | \ / (Amazing ASCII art, right?) Hexagons can be linked together by sharing sides: / \ / \ | | | \ / \ / / \ | | / \ / | | \ / A...

Hey there!

o/

I just made a new sandbox post about Google autocomplete results.

gist.github.com/ckjbgames/f7bfa353e639f4a449fc57ab0a7befd3

0

Google Autocomplete Fun code-golfinternetstring Your task is to create a program which, given an input string, will output the first Google autocomplete result for that search. The format of input/output is up to you. Rules Your program must take 1 input, a string, and output the top Goog...

8:10 PM

looks good to me

._. why is libgit2 docs saying to link dylib for "static library instructions"

that is like oxymoron

lol

@Riker Anything I could improve?

still thinking

@Riker k

8:15 PM

I'd recommend requiring them to check with you regarding which URL to use

otherwise that seems prone to abuse

"my short url is better, it's shorter and thus better"

@Riker I did state that URL shorteners weren't allowed.

url shortener != shorter url

But, I will add the whole bit about explicitly using 1 URL.

@Riker yeah

@Riker Thanks for clarifying!

np

New Sandboxed Posts

gosh darned autocorrect always getting in my way

8:22 PM

@ComradeSparklePony Hello

code-golf graphical-output image-processing fractal

4

Q: The Image of the Dragon

I saw a cool gif of the twin dragon curve made from a square, and wondered what would happen if we started from another base image. So I wrote a program to do this. It's so cool that I thought it would be fun to do it as a challenge. Task You will take...

0

Q: Double Me A Quine

You are to make a program that will output its source code twice in a row with no delimiter. The only catch is that the output must also do the same thing and so on. For example, this problem is easily solved in HQ9+ with the following program: QQ QQ will output QQQQ which itself will output QQ...

code-golf quine

oh no, xcode is trying to compile every file including stuff in .git folder >_>

oh no what have I done

8:39 PM

Does anyone else like spicy food?

flawr

yep

Why Do Some People Tolerate Spicy Food?

I am talking like Reaper hot

DO you ever feel like people just don't understand how great spicy foods are?

►

flawr

8:58 PM

@Christopher For me still a lot of things are too hot, but I do still enjoy spicier things than most people I know.

@flawr I have gone into the deep end. Flashbang hot sauce. Hottest in the world (afaik iirc). Nothing but hotsauce and a chip.

It was hot. And I didn't take milk or anything. 10/10 would do again

alias yolo='git commit -am "DEAL WITH IT" && git push -f origin master'

mınxomaτ

→ 21 messages moved to Pxls Space

Yay, just finished running some graphics benchmarks, my computer didn't crash with VIDEO_SCHEDULER_INTERNAL_ERROR for the first time in like ~6 months! I can play games now!

Nice job!

9:12 PM

Thanks AMD for new drivers!

code-golf string internet

1

Q: Google Autocomplete Fun

Your task is to create a program which, given an input string, will output the first Google autocomplete result for that search. The format of input/output is up to you. Rules Your program must take 1 input, a string, and output the top Google autocomplete/auto-fill suggestions result. The f...

9:44 PM

2

Q: Tips for golfing in SOGL

Do you have any code-golf tips for writing in SOGL, a golfing language created by dzaima? Your tips should be at least somewhat specific to SOGL. Please post one tip per answer.

code-golf tips

@DJMcMayhem was your computer hacked O_o

code-golf graphical-output image-processing fractal

What is unclear about this challenge? I would like to make it clear

9

Q: The Image of the Dragon

I saw a cool gif of the twin dragon curve made from a square, and wondered what would happen if we started from another base image. So I wrote a program to do this. It's so cool that I thought it would be fun to do it as a challenge. Task You will take...

@Downgoat XD nope definitely not, that's all intentional

@Pavel at least do -fu instead of -f

What does -u do?

9:57 PM

@Pavel sets default upstream

kk, apparently Xcode doesn't actually have entire C standard library ._.

Question: Clang doesn't seem to be have uint64_t, is there some flag I need to add?

Why are you using Clang and not GCC?

@Pavel build should work on all compilers or else something is wrong

Well, I looked it up on SO, the answer was to use GCC instead.

New Sandboxed Posts

10:25 PM

0

Test if a string can be made with substrings! Given a string and a list, say if the string can be made with items from the list. That is the golfed version of the question, here is the full: Given a string s and an array/list l, determine whether or not s can be made with parts from l. For ...

mınxomaτ

10:36 PM

@Downgoat uint64_t should be in stdint.h or inttypes.h. For C++ it's cstdint. If all else fails, try <sys/types.h>

@mınxomaτ actually it was that in the include/ dir there was a stdint.h already which wasn't exactly properly working so yeah :P

yay, now macros aren't working :/

though I'm not sure why it would be looking at include/stdint.h when it was #include <stdint.h> :/

10:53 PM

Question: if a header is not found, does/should Clang throw an error?

mınxomaτ

If the header isn't found, and clang doesn't error, how do you even know what header you are talking about?

I mean there is only one header in file

TIL Clang with C89 is not actually C89

ASCII-only

11:19 PM

@Downgoat because headers are normally in /usr/bin/include maybe?

Q: When do extra parentheses have an effect, other than on operator precedence?

@ASCII-only no I mean in the user search path

:D only 11 errors now

#	define MIN(x,y) (((x) < (y) ? (x) : (y)))

Is there any reason to have to parens instead of just 1

ASCII-only

73

Parentheses in C++ are used in many places: e.g. in function calls and grouping expressions to override operator precedence. Apart from illegal extra parentheses (such as around function call argument lists), a general -but not absolute- rule of C++ is that extra parentheses never hurt: 5.1 Prim...

c++ c++11 language-lawyer parentheses c++-faq

10/10 quality avatar

Destructible Lemon

yo

aww yiss, down to 7 errors

Question: does anyone know what: "Unsupported: typedef changes linkage of anonymous type, but linkage was already computed" means in english

Destructible Lemon

11:34 PM

"I hate you"?

TuxCopter

omg why

You know you're screwed when you google error messages and the mailing lists come up >_>

11:46 PM

:O I think this is compiler bug

ATaco

Nice

Destructible Lemon

@Downgoat does that mean I was right?

yes