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Adám
Adám
6:17 PM
Announcement: APL Cultivation in 13 mins.
 
Digital Trauma
Digital Trauma
6:32 PM
@vazt I think your submission is legal - why did you delete it?
 
orlp
orlp
@user202729 please use an actual graph implemenation
rather than ad-hoc ascii
 
moonheart08
moonheart08
the "is this number a prime" question has no x86 assembly answer. Hersey!
Also, does linux do instruction emulation? (Does it emulate the functionality of instructions not available on your CPU)
 
Pavel
Pavel
@moonheart08 Depends on what exactly you mean. You can run i386 programs on amd64 linux.
 
moonheart08
moonheart08
I mean like emulate the SSE instructions if the current processor lacks a hardware implementation
(On x86)
 
orlp
orlp
@moonheart08 I believe that this is technically possible, but am not aware of any implementations
 
moonheart08
moonheart08
6:40 PM
KVM can do instruction emulation
The kernel even supports doing so
 
orlp
orlp
it's disgustingly slow though
because the operating system would have to catch illegal instruction faults
all registers need to be saved
then the operating system needs to figure out that the illegal instruction was a certain one, run its software fallback, restore registers and hand control back
 
Pavel
Pavel
Some amd64 cpus do isntruction emulation at the firmware level because they don't include some uncommon instructions
 
orlp
orlp
@Pavel that's something entirely different than the OS implementing it
 
moonheart08
moonheart08
@orlp The only thing that instruction emulation in linux's kernel is actually used for (that i know of) is virtual instructions provided by modules
 
New Main Posts
New Main Posts
6:58 PM
1
Q: Factory workers

loladChallenge Factory workers are usually very hard-working. However, their work is now being commonly replaced with machines. You have to write a program that takes a number as input. It will print out a factory of 10 workers 10 times. Every time, each worker has a 1/input chance of being 'fired' ...

code-golf random
 
moonheart08
moonheart08
7:36 PM
Is there some sort of API i can use to get the answers to a question? (Asking for a KoTH challange i'm working on)
 
caird coinheringaahing
caird coinheringaahing
 
dzaima
dzaima
@moonheart08 people have made KotHs before, IIRC there was some system already made for people to use for KotHs
 
caird coinheringaahing
caird coinheringaahing
42
Q: Introducing a KOTH server!

PhiNotPiNote: Due to changes with RedHat's hosting service, the website is currently down. There are some (very) early-stage plans to create a bigger, better version. That being said, if you want to see a new KOTH server be built, please voice your support so that we can gauge demand / tailor it to th...

discussion
It appears to not be working though
 
moonheart08
moonheart08
I've already seen that :p
 
dzaima
dzaima
@moonheart08 will the KotH be language agnostic or limited to JS (as to be in-browser usable)?
 
moonheart08
moonheart08
7:41 PM
It'll be limited to anything that can be compiled to a .so file (To keep things running quickly. I'll be making a web GUI as well)
On that note, i'm the kind of person to be worried about security, so what measures should i take to prevent malicious answers from causing trouble?
 
caird coinheringaahing
caird coinheringaahing
.so file? Stack Overflow has it's own file type now?
 
moonheart08
moonheart08
:P
It also has it's own town, and a child named after it.
 
dzaima
dzaima
@moonheart08 right, I was thinking of an answer loading system for JS
 
moonheart08
moonheart08
Actually. Hrm.
.so files bring their own issues (How to compile the provided programs?)
But i can work with that. Just give a list that i'll support
Actually..
javascript might be a better idea shrug
 
DLosc
DLosc
@DJMcMayhem This was a fun one. Pip, 8 bytes: $=_MSENg
0-indexed; returns the number of values that match their indices.
Other 8-byte solutions: $=_FIENg or 0N$-*ENg
 
Soaku
Soaku
7:54 PM
I'm struggling with encoding problem in Python 3.6; I've got a multiline string and it doesn't correctly work with UTF-8. File encoding is UTF-8, file has it declared on the top, PyCharm settings are also configured this way. I tried putting the string in a file and reading from it (file is still utf-8) but it's still handled wrong.

It's not the output console bug, I've tried sending the text with requests`module to a website and it's still the same
What am I doing wrong? Never worked with UTF-8 in Python
 
caird coinheringaahing
caird coinheringaahing
What's the error and the code? TIO link?
 
Soaku
Soaku
@cairdcoinheringaahing I'm not saying there are any errors; the utf is just handled incorrectly
ex. I get moĂ…ÂĽesz zamiast możesz
 
caird coinheringaahing
caird coinheringaahing
So what's the problem?
 
Soaku
Soaku
@cairdcoinheringaahing The utf-8 is handled incorrectly?!
 
caird coinheringaahing
caird coinheringaahing
What do you mean by handled incorrectly? What are you trying to do? What should your result look like? What does it actually end up being?
 
Soaku
Soaku
7:57 PM
@cairdcoinheringaahing -_- are you serious? Why you keep asking about something I've already provided?
An example sentence in Polish: W tym temacie możesz expić is printed as W tym temacie moĂ…ÂĽesz expić.
 
caird coinheringaahing
caird coinheringaahing
What console is it outputting to?
 
Soaku
Soaku
@cairdcoinheringaahing I'm creating a bot which sends the result to a website, but it seems that there is no problem with the connection, but with the program, since print output is bugged too
wait, I'm preparing an example
 
caird coinheringaahing
caird coinheringaahing
@Soaku This might be happening in your print statement. It's converting each individual byte, rather than interpreting some as 'continuation' bytes
 
Soaku
Soaku
@cairdcoinheringaahing As said, the output is also sent to the server (there is return, really) which does output the same... But wait, I think I missed something
 
caird coinheringaahing
caird coinheringaahing
I have no idea how you'd be able to fix it though
 
Soaku
Soaku
8:06 PM
Uhh, now server seems to decline the requests... o_o
 
caird coinheringaahing
caird coinheringaahing
@Soaku Try changing with open(path+"data.txt", "r") as s: to with open(path+"data.txt", "r", encoding='utf-8') as s:
 
Soaku
Soaku
oh my god.
I've thought I've tried it. Because I did. On wrong `open` tho
thanks
 
caird coinheringaahing
caird coinheringaahing
np
 
Soaku
Soaku
I should really try rubber duck programming sometimes. Or rather, think before I do
 
Poke
Poke
isn't utf8 python's default encoding these days?
i'm surprised that's the issue
 
caird coinheringaahing
caird coinheringaahing
8:09 PM
Not when opening text files, IIRC
 
Poke
Poke
interesting
i had initially suspected that but then disregarded haha
 
Soaku
Soaku
@Poke @cairdcoinheringaahing I don't know what could be the issue, since I've tried it with a normal string before.
And it didn't work
 
Poke
Poke
ooo
 
caird coinheringaahing
caird coinheringaahing
In that case, I have no clue, sorry
 
Poke
Poke
check to make sure there's no implicit encoding/decoding everywhere possible
 
Soaku
Soaku
8:11 PM
Would't be asking for no reason :P.
 
Poke
Poke
python keeps strings in a "unicode" format internally which confuses me a bit
 
Soaku
Soaku
@Poke No, there isn't. Or wasn't, because I've tried to force utf-8 and it didn't work still
 
dzaima
dzaima
 
Soaku
Soaku
Well, I keep having weird problems with everything, occasionally. So there's no need to worry, I think [mdshrug]
 
AdmBorkBork
AdmBorkBork
@Poke That's about as bad as PowerShell keeping everything UTF-16 internally.
 
caird coinheringaahing
caird coinheringaahing
8:14 PM
@AdmBorkBork That reminds me: I hate Powershell. I spend 2 days trying to figure out why the € character was breaking my code before realising that typing chcp 65001 solved it ಠ_ಠ
 
Soaku
Soaku
@dzaima My original question was rather why it doesn't work with the string... Sorry if I'm saying stuff to ambiguous
¯\_(ツ)_/¯
(why my [mdshrug] auto-replacement doesn't work ಠ_ಠ) nevermind, had a typo
 
Poke
Poke
@AdmBorkBork I think java and c# do that too. That kinda makes sense, though
 
AdmBorkBork
AdmBorkBork
@cairdcoinheringaahing That's more a Windows status-by-design than a PowerShell issue, though.
@Poke It does until you're wanting to get a raw UTF-8 filestream input/output. Then it's super annoying and leads to unwanted behavior.
 
Poke
Poke
encodings are about as fun as http rfcs
 
AdmBorkBork
AdmBorkBork
that's a tautology, right there
 
Poke
Poke
8:22 PM
haha
 
caird coinheringaahing
caird coinheringaahing
 
mbomb007
mbomb007
In case anyone wants to see what I've been working on:
0
Q: Div resizing with mouse expands too fast

mbomb007For fun, I am creating a widget that can be toggled to use vertical typing (e.g. for Japanese). The vertical part is being done with a div that is contenteditable. At the moment, you can see both the textarea and the div, and watch their content change in sync. The checkbox does nothing yet. My ...

javascript html css resize
 
Christopher
Christopher
My computers fan is running so loud. Who knew exporting high quality video projects took so uch energy?
 
caird coinheringaahing
caird coinheringaahing
Q: When using argparse is there a way to get a given flag to not require the normal standard flags? E.g. when using flag -a, you must have the program parameter, but when using --help-me you don't?
 
Christopher
Christopher
@user56656 please no
 
mbomb007
mbomb007
9:07 PM
@cairdcoinheringaahing That's how the default help arg works, isn't it?
 
caird coinheringaahing
caird coinheringaahing
Yes, but I want to add my own 'help' option, with the same behaviour (different message though)
 
mbomb007
mbomb007
 
Leaky Nun
Leaky Nun
CMC: Given polynomial f with integer coefficients, find integer n such that f(m) and f(m+1) have the same sign for every m > n
 
mbomb007
mbomb007
@cairdcoinheringaahing See the help option for the action parameter
You can disable the default help and replace it with your own.
In short, when creating your argparse.ArgumentParser, set add_help=False, then you can add an argument with a help action or a custom action.
 
Pavel
Pavel
@LeakyNun Isn't that just the rightmost root
 
H.PWiz
H.PWiz
9:14 PM
@Pavel Or bigger
 
caird coinheringaahing
caird coinheringaahing
@mbomb007 Hmm, I'll keep that in mind, thanks
 
mbomb007
mbomb007
@cairdcoinheringaahing Also, if you need to use a multi-line help description, you need to add a formatter class. Like this:
 
Leaky Nun
Leaky Nun
@Pavel well you don't need to find the smallest such integer
 
H.PWiz
H.PWiz
@LeakyNun APL, 3 bytes: +/|
 
Leaky Nun
Leaky Nun
not every language likes to find roots
 
mbomb007
mbomb007
9:15 PM
parser = argparse.ArgumentParser(prefix_chars='/-', add_help=False, description=__description__, formatter_class=argparse.RawDescriptionHelpFormatter)
 
Leaky Nun
Leaky Nun
@H.PWiz interesting. why does it work?
 
H.PWiz
H.PWiz
 
Leaky Nun
Leaky Nun
you knew I was gonna ask you that didn't you
 
H.PWiz
H.PWiz
Well, I had the tab open already
 
Pavel
Pavel
@LeakyNun ಠ_ಠ this would be so much easier if this was m and m-1 and m<n
 
H.PWiz
H.PWiz
9:19 PM
@Pavel Why?
 
Leaky Nun
Leaky Nun
@Pavel Why?
 
Pavel
Pavel
@H.PWiz Mathematica has a builtin to give the nth root of a polynomial, but determining how many roots there are is much harder.
So I can get the first root very easily and the last one with a bit of work
 
Leaky Nun
Leaky Nun
@Pavel can't you use f(-x) to horizontally reflect a polynomial?
so that the first shall become the last and the last shall become the first?
 
Pavel
Pavel
@LeakyNun Yeah, but it takes a function
 
Leaky Nun
Leaky Nun
can't you compose it
 
Pavel
Pavel
9:21 PM
Yes I can and I feel dumb
 
H.PWiz
H.PWiz
CMC: Given the polynomial f(x) return the polynomial f(-x)
 
Pavel
Pavel
@LeakyNun Test case please
 
Leaky Nun
Leaky Nun
@H.PWiz Jelly, 5 bytes: J-*×N
@Pavel x^3-6x^2 gives any integer greater than or equal to 6
 
ETHproductions
ETHproductions
@H.PWiz Japt, 5 bytes: Ë*JpE
 
H.PWiz
H.PWiz
I have 4 bytes in APL, taking the coefficients in increasing power order
@LeakyNun 4 bytes in Jelly too
 
Pavel
Pavel
9:28 PM
@H.PWiz #@*(-#&)&
@LeakyNun I treid this and for some reason it's telling me that the resulting function only has a single root at 0 ._.
Actually, it says two roots at 0
If i try to take the general Root of the equation, I get x == 6 || x == 0 || x == 0
Which makes this even dumber
@LeakyNun If we were looking for the smallest root, the solution would be Floor@Root[#,1]&
 
Leaky Nun
Leaky Nun
@H.PWiz no idea...
 
H.PWiz
H.PWiz
@LeakyNun It uses \
 
Pavel
Pavel
@H.PWiz Taking it as a list of coefficients, -#&
 
H.PWiz
H.PWiz
@Pavel Link please
 
Pavel
Pavel
@H.PWiz Nvm I accidentally did -f(x)
 
mbomb007
mbomb007
9:55 PM
If anyone wants to test an interesting thing I made, let me know if there are any issues (besides the cursor movements not showing).
 
xfix
xfix
10:06 PM
disappointing, so a future version of PHP won't support unquoted strings
although i think specifically saying "PHP 7.1" or whatever is fine, right?
 
Pavel
Pavel
TIL: Nearly 90% of Java devs use Java 8, despite Java 10 having come out just now.
Why does no one use 9, I wonder
 
xfix
xfix
i sorta suspect it has to do with extremely short support period and rather minor improvements
although i suppose List.of, Map.of and Set.of is meaningful for codegolf
although i recently posted a solution for Java 9, so dunno
0
A: Produce the number 2014 without any numbers in your source code

xfixjshell, 5 bytes How to make Java an useful code golf language? Simple, just remove the need to declare classes, methods, make things automatically print and so on. +'ߞ'

5 bytes
 
Adám
Adám
@H.PWiz How may we take the polynomial? As a function? Vector of coefficients?
 
xfix
xfix
i sorta want to try more Java 9/10 codegolfing, because jshell has so much codegolf potential (especially due to keybindings)
 
H.PWiz
H.PWiz
@Adám Not my original intention, but if you do you should return a function.
 
xfix
xfix
10:19 PM
Java 10's var isn't even a big deal as far jshell code golfing is concerned because there is Shift-Tab V combination for declaring variables
 
Adám
Adám
@H.PWiz Is ⎕- valid?
 
H.PWiz
H.PWiz
@Adám Can I have a link please?
 
Adám
Adám
Prompts for a function, e.g. ⊥∘1 2 3 4 returns the atop ⊥∘1 2 3 4-
 
H.PWiz
H.PWiz
Looks valid to me. An interesting solution
 
Adám
Adám
 
xfix
xfix
10:31 PM
oh, this is interesting, jshell doesn't require effectively final bindings for lambdas
which is nice, could shorten code golf programs (i wonder if that's a bug, but i mean, it's a feature)
i suppose it has to do with local variables being actually class static variables due to how Java REPL was implemented
okay, using an explicit block complains about variable not being effectively final (as it forces it to be a local variable)
 
Pavel
Pavel
C# has had it's own REPL for a bit (csi). The repl itself sucks so fucking much (you can't even use arrow keys to move the cursor).
Then they pretty much accidentally made it be hella useful by letting it run C# from files, giving us C# script, which is super neat.
That said, Mono's REPL (csharp) is fantastic and comes with autocomplete and stuff
 
ASCII-only
ASCII-only
@Pavel Same with c# interactive :P
 
Pavel
Pavel
@ASCII-only Isn't that just Visual Studio's wrapper around csi?
 
mınxomaτ
mınxomaτ
Mono 5.10 also has an additional interpreter for MSIL assemblies: mono-project.com/news/2017/11/13/mono-interpreter
 
ASCII-only
ASCII-only
@Pavel who knows, it probably is
 
Leaky Nun
Leaky Nun
10:47 PM
CMC: given integer n with n > 0, return the list of [a1 a2 ... an], where each ai is a non-empty sublist of [1 .. n], and a1 ⊂ a2 ⊂ ... ⊂ an.
e.g. for n=3, return [[[0],[0,1],[0,1,2]],[[1],[0,1],[0,1,2]],[[0],[0,2],[0,1,2]],[[2],[0,2],[0,1,2]‌​],[[1],[1,2],[0,1,2]],[[2],[1,2],[0,1,2]]]
(each layer can be in any order)
I accidentally shifted 1 2 3 to 0 1 2 in my example
 
H.PWiz
H.PWiz
Is a1 [[0],[0,1],[0,1,2]]? how is that a sublist of [1..n]
 
Leaky Nun
Leaky Nun
for n=3, return [[[1],[1,2],[1,2,3]],[[2],[1,2],[1,2,3]],[[1],[1,3],[1,2,3]],[[3],[1,3],[1,2,3]‌​‌​],[[2],[2,3],[1,2,3]],[[3],[2,3],[1,2,3]]]
@H.PWiz return all possible such lists, i.e. [[1],[1,2],[1,2,3]] is a possible list
 
H.PWiz
H.PWiz
Oh, got it
 
Pavel
Pavel
11:26 PM
CMC, given a list of lists of integers 0-9, append enough 0s to end of each list to make each list the same length as the longest list in the input. [[1], [1, 2, 3], [0, 2]] => [[1, 0, 0], [1, 2, 3], [0, 2, 0]]
 
ngn
ngn
@Pavel apl: ↓↑
 
Pavel
Pavel
@ngn What does ↑ do?
 
ngn
ngn
@Pavel "mix" a vector of vectors into a matrix, padding with 0s
 
caird coinheringaahing
caird coinheringaahing
11:46 PM
@Pavel Jelly, 3 bytes: z0Z
 
ngn
ngn
@LeakyNun oK: 1+{((#x)#x)@<x}'',\'prm n
@H.PWiz apl: -\
 
H.PWiz
H.PWiz
@ngn No?
@ngn x + x² -> -x + x²
 
ngn
ngn
@H.PWiz can we represent the polynomial as a vector of coefficients - from the constant term to the highest power of x?
 
H.PWiz
H.PWiz
Yes, that's how I solved it
 
ngn
ngn
@H.PWiz ah, I see... I need a monadic -
@H.PWiz ⊢∘-\
 
H.PWiz
H.PWiz
11:59 PM
@ngn That's what I had (inspired by you)
 
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