The Nineteenth Byte

Beta Decay

6:14 AM

This is awesome: blog.stephenwolfram.com/2017/06/…

Phoenix

Yes it is

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Transpose the input code-golf Given a textual input, output its transposition. Test cases Test 1 Hello, world! Hello, world! Test 2 ABCDEFGHIJKLMNOPQRSTUVWXY AFKPUBGLQVCHMRWDINSXEJOTY Test 3 Some lines maybe longerthan others. Sbtoehm aeln o lnoigtneheres r sm .ay

Helka Homba

@BetaDecay CMC: find a number on wolframcloud.com/objects/sw-blog/capanels that makes a smiley face pattern

Beta Decay

@HelkaHomba That's harder than finding a Hello World program in Seed :D

Anyone here from Cambridge?

Lembik

hi all

@BetaDecay Which country?

codegolf.stackexchange.com/q/125158/9206 is confusing me.. isn't there a simple formula?

Beta Decay

6:29 AM

@Lembik UK haha

Lembik

aha :)

uni or town?

Beta Decay

Either really

Lembik

that's quite a difference!

are you hoping someone with vote by proxy for you? :)

Beta Decay

Haha yeah, we need to get the votes for the Monster Raving Looney Party in ;)

Lembik

now..which leader are you referring to ? :)

caird coinheringaahing

6:34 AM

Excuse me. My vote goes to Harambe

Lembik

as an outside observer it seems no one has any idea what is going to happen in the election

Beta Decay

Anyway, I was just wondering. I'm thinking of applying to enter in 2018

Lembik

is that right?

@BetaDecay oh applying to the university!

Beta Decay

@Lembik Yeah haha

Lembik

then someone from cambridge would be completely irrelevant wouldn't they? Unless you want a map

I might be able to help... what would you like to know?

caird coinheringaahing

6:35 AM

We need a strong and stable gorillament

Lembik

Which subject?

Beta Decay

Nat Sci

I was just gonna ask if the train station was as good as it looks in the photos really

Helka Homba

What music goes good with Rubik's Cubes?

Beta Decay

Something Hungarian

Lembik

@Mego how do you get to 437 for N = 5?

Helka Homba

6:46 AM

@BetaDecay that is ~20min long, mostly ambient, and free to use,?

Lembik

@Mego ah... it is 2^N :)

@BetaDecay train section??

@BetaDecay do you go to a fancy high school?

@BetaDecay actually.. are you really deciding if you want to go to cambridge or more if you will be likely to get in?

Beta Decay

@Lembik I go to Ruthin School. Well I know I want to go and I think I've got the grades... But I'll just wait and see

I have to get an average of 85% in every exam for my headteacher to let me apply

Lembik

@BetaDecay isn't the first rule of high school, never tell anyone online any personal information?

but I had no idea that school existed so thank for that!

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Which HEX color should I use? Introduction Oh dear! I can't choose which color to use! So... I've been working on a console with only 16 colors. And sometimes, the color I want does not perfectly match the 16 colors. Can you help me out a bit? Challenge Given an input(could be from STDIN o...

Beta Decay

Well I don't think there's that much harm in knowing which high school... Pretty much everyone here is international and that's the only personal information anyone knows about me AFAIK

Lembik

6:53 AM

@BetaDecay it allows a crazy person to physically find you but it's up to you of course

Beta Decay

Mm I suppose

Lembik

so not so many Welsh people there?

ASCII-only

2

Q: ELECTRONIC SURVEILLANCE REPORT 1706

I found this in my Inbox today. I think someone is playing a prank, but ... well ... I'm really not sure! Puzzling friends, can you please take a look and see if you can tell what's up with this message? Date : 08-JUN-2017 Dossier : RAND AL'THOR Subject : ELECTRONIC SURVEILLANCE REPO...

Be careful we're being monitored :P

Lembik

that's a fun puzzle!

Beta Decay

Noooo

Lembik

6:57 AM

@BetaDecay ?

was Noooo about Welsh people?

Beta Decay

No haha, the monitoring

Lembik

so what about the Welsh? :)

Beta Decay

And no, there are very few Welsh people

Lembik

fascinating

and not so many English either it sounds

Helka Homba

How does soundcloud play and keep track of music playing across tabs without interruption? So smooth

Some fancy cookies I guess

Beta Decay

6:59 AM

@Lembik Haha nope. Mostly from China/HK

Lembik

sounds like the school could be on the moon!

they don't even get home tuition fees I understand from living in the UK

you wonder why they bother

Beta Decay

Sorry, gtg

Lembik

bye

Downgoat

7:19 AM

@ASCII-only <insert sheep joke>

ASCII-only

@Downgoat O_o ono it's super late aren't you going to die from ~~sheep~~ sleep deprivation

Alex K Chen

7:37 AM

While using the getchar() function, you need a input file to read, right ? How'd you load that ?

Leaky Nun

def _copy_immutable(x):
    return x

Well played, python

(from https://github.com/python/cpython/blob/3.6/Lib/copy.py#L111)

ASCII-only

@Downgoat if you're still online: why does foo {} cause ambiguity

Leaky Nun

@ASCII-only which language?

ASCII-only

@LeakyNun VSL, what other language do I have access to the parser of :P

Alex K Chen

Anyone on my question ?

Leaky Nun

7:40 AM

@AlexKChen which language?

Alex K Chen

C

ASCII-only

@AlexKChen int getchar(void)

Leaky Nun

what do you mean "how would you load that"?

ASCII-only

It reads from STDIN

Leaky Nun

#include <stdio.h>

int main ()
{
   char c;

   printf("Enter character: ");
   c = getchar();

   printf("Character entered: ");
   putchar(c);

   return(0);
}

Alex K Chen

7:41 AM

Wait, I'm telling you.

ASCII-only

@AlexKChen You can't use an input file

Leaky Nun

@ASCII-only and what is VSL?

ASCII-only

VSL

ide.c9.io/somebody1234/node-vsl

hackmd.io/…

Alex K Chen

I have loaded Code::Blocks yesterday, and running codes. When you write code to count words or space or some other characters, it just opens a command prompt, and I keep adding characters and it doesn't shows anything.

ASCII-only

@AlexKChen You can't use an input file with getchar()

@AlexKChen Well yeah? It reads from STDIN, not a file

Alex K Chen

7:43 AM

What's STDIN ?

ASCII-only

What you want is probably getc(file)

@AlexKChen Console input

Alex K Chen

Okay, but I keep typing and when does it know that it has reached EOF ?

It just never shows any output.

ASCII-only

Use Ctrl+D to send end of file, Ctrl+Z then Enter if you're on windows

Alex K Chen

Wait, I'm giving the code.

Leaky Nun

@ASCII-only any example program? test.vsl and test2.vsl aren't very satisfying...

Alex K Chen

7:46 AM

#include <stdio.h>

main()
{
int c,l;
l = 0;
while ((c = getchar()) != EOF)
if (c== '\n')
++l;
printf("%d",l);
}

Leaky Nun

press Ctrl+K

Alex K Chen

When I am running this, it's opening a command prompt, and I keep typing a pressing enter, nothing happens.

@LeakyNun It's showing "^K", nothing still

ASCII-only

@LeakyNun Well there's no compiler yet, a full-featured language isn't exactly easy to write a compiler for, plus the syntax used to change quite a lot so there was no point having an example file

Leaky Nun

@AlexKChen I mean, press Ctrl+K to format your code

@ASCII-only alright

ASCII-only

3 mins ago, by ASCII-only

Use Ctrl+D to send end of file, Ctrl+Z then Enter if you're on windows

@AlexKChen If you want it to end on enter then check against enter not EOF

Alex K Chen

7:48 AM

@ASCII-only What to do ? I keep pressing Ctrl D, Ctrl Z (I am on windows) and it's showing "^D" or "^Z".

@ASCII-only I mean, the programme is for counting enters, so how will it terminate ?

ASCII-only

@AlexKChen Wait yeah you need to press enter after pressing Ctrl+Z

Or you should be able to just pipe in a file: program.exe < file.txt

Alex K Chen

But then how it would work for multiple lines ? The lines before the Ctrl+Z are all ignored, so the output is always 1 @ASCII-only

@ASCII-only Any tutorial on that online ?

ASCII-only

gtg now sorry will be back in like 45 minutes

Leaky Nun

@AlexKChen you just need to type < file.txt in CMD

Alex K Chen

Suppose my file is located on desktop, and it's named "test.txt". What should I do to read from that file @LeakyNun ?

Leaky Nun

7:53 AM

@AlexKChen what do you type in CMD to run the C file?

Alex K Chen

I don't type anything in CMD. I type the code on Code::Block, and then click "Build+Run", it automatically does.

Leaky Nun

oh, I don't know then

Alex K Chen

@ASCII-only Any ideas.

Anybody else ?

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

What type are my suffixes? So I've been wasting my time again researching suffix sorting algorithms, evaluating new ideas by hand and in code. But I always struggle to remember the type of my suffixes! Can you tell me which type my suffixes are? Left-most what? A lot of suffix sorting algorith...

Mayube

8:19 AM

Hmm, so in the case of the anagram quine challenge, would \n1 (which outputs 1\n in Braingolf) be valid? I don't think it meets our definition of a proper quine (minus the quine part), but I'm not entirely sure

ASCII-only

@AlexKChen Ctrl+D then Enter really doesn't work? O_o

Alex K Chen

@ASCII-only Nope. I'm windows 8.1 64 bit.

ASCII-only

@AlexKChen *Ctrl+Z

Alex K Chen

Ctrl+Z only reads that line - not all lines before it.

ASCII-only

cboard.cprogramming.com/c-programming/…

@AlexKChen Hmm really? Weird

Alex K Chen

8:23 AM

Oh yeah it does !

Sorry.

Danke, @ASCII-only

Qwerp-Derp

Should I make a new subreddit for programming language design?

Mayube

@Qwerp-Derp there's probably one already

ASCII-only

@Qwerp-Derp Well you can, IDK if you should

Qwerp-Derp

@Mayube I mean there is, but there's no posts, and the author's managing something else

Mayube

8:39 AM

Oh hey @ASCII-only, I'm finally making progress with that lisp-y language I was working on

ASCII-only

@Mayube Yay :D

Qwerp-Derp

@Mayube Did someone say lisp? :P

Mayube

@Qwerp-Derp no, I said lisp-y

and it's only really lisp-y in the sense that it follows the general syntax of (func arg arg)

Qwerp-Derp

@Mayube Regardless, can you give some snippets?

Mayube

(: val 11) (@ (: val (- val 1)) (p val)) Will print 10, 9, 8... 1

Same snippet, verbose func names: (set val 10) (while (set val (sub val 1)) (print val))

Qwerp-Derp

8:42 AM

@Mayube Oh, it's a golfing language

Mayube

no, it isn't

just some of the primitive functions have 1 character aliases

: - set p - print @ - while + - sum - - sub * - mul / - div

Leaky Nun

@Mego only one user answered the CMC: you...

Mayube

@LeakyNun that means he wins by default, right?

Leaky Nun

@Mayube sure

@Fatalize I just discovered that long variable names also work in the code, as long as every letter is uppercase

Luis Mendo

8:57 AM

@JDoe Very good ideas! Thanks, edited. I got rid of | and :, in case they are useful for 24

ASCII-only

@Mayube pls link to github repo

Mayube

@ASCII-only Btw I totally ignored your advice for the most part, but at least I'm not using regex

ASCII-only

@Mayube oh god it looks so slow

Mayube

Still faster than Jelly

Fatalize

@LeakyNun Of course it does, Brachylog transpiles the Input/Output using the same code as what transpiles the program, so if it works in the former it works in the latter!

Mayube

9:05 AM

> tfw your language takes a whole second to parse and run the sourcecode 1, when all it does is print 1

poor jelly

ASCII-only

Well Mathics took 9 seconds

Mayube

I don't have any sort of timer or benchmarker on ArcPlus, but (p 1 doesn't take long at all :P

ASCII-only

Also :| Charcoal takes 0.3s total (0.05s sys time though), probably from needing to load like 100kb of python lol

@Mayube But it's got like 100x fewer builtins

Mayube

heck even (p 1) all the way to (p 30) runs near instantly

true

but the builtins are all just in a dict, and it's key-based lookup, so it won't be that slow even with a bunch of em

ASCII-only

@Mayube also pls initialize dict using {'foo': bar} not dict['foo'] = bar

plssss

Mayube

9:09 AM

@ASCII-only no, for the same reason I use semicolons in python :P

That reason being: because I can

ASCII-only

but it's slow ;_;

Mayube

@ASCII-only but like, is it actually?

Erik the Outgolfer

yay finished exams today :D

ASCII-only

9:28 AM

@Mayube D: D: D: how could you do this heresy this is terrible starts making another interpreter

@Mayube also pls change sum to add

Mayube

@ASCII-only no C:

ASCII-only

@Mayube also oh god what black magic does runFunc do

Mayube

black magic?

all it does is run the passed function...

ASCII-only

I can do that in like 40 characters with verbose argnames though

Erik the Outgolfer

vote to close...

ASCII-only

9:36 AM

@Mayube hmm how do you define functions

Mayube

@ASCII-only look in initEnv()

a function is an env variable of type = func where value is an anonymous js function

ASCII-only

@Mayube Yeah as in how do you define functions in the language

Mayube

oh, you can't yet

ASCII-only

@Mayube also forgot to say but: ew

New Main Posts

0

Q: Smallest Java program

What is the smallest, in terms of space, possible compilable and runnable Java code? The first code I can think of is below: public class C { public static void main(String[] a){ } }

java

0

Q: ROT13 and upside-down text (flip text)

When I saw this title in the Hot Network Questions I thought it was going to be a PPCG challenge. I was a little disappointed when it was on Mathematica. So now it is on PPCG: Challenge Given an input string, output the ROT13, flipped value. The input will contain characters from the following...

code-golf

ASCII-only

9:39 AM

@Mayube oh btw can you have like (fn arg1 arg2 arg3)

@Mayube Also is there a non hacky way to take number input

Mayube

@ASCII-only define non-hacky

ASCII-only

@Mayube Not using JS cast hacks (i.e. using defined behavior in the interpreter)

jsfiddle.net/somebody1234/a3ywsdz6/7/…

Qwerp-Derp

10:08 AM

I might need to write a new flavour of regex for Dart, mainly because JS regex is trash :P

ASCII-only

@Qwerp-Derp You make it sound 1. easy to write a new regex flavor, 2. like you're a core dev for Dart :P

Qwerp-Derp

@ASCII-only But JS regex is awful... and it's an opportunity to learn some new cool stuff in both Dart and regex design while making a new flavour

But yeah, I get what you mean :P

ASCII-only

@Qwerp-Derp How exactly is JS regex awful

Qwerp-Derp

Underdeveloped, it's pretty painful to write a good regex

No recursion, named capturing groups, lookbehinds, variable-length lookaheads

I could go on

ASCII-only

@Qwerp-Derp Good regex?

@Qwerp-Derp Well you usually don't need that unless you're trying to parse a non-regular language

And seriously? Regex isn't the way to parse a language

Mayube

10:14 AM

@Qwerp-Derp are you trying to parse html? don't try to parse html, regex is not a tool designed to parse html

Qwerp-Derp

@Mayube ZALGO IS COMING AGAIN

@ASCII-only But cool features... :(

ASCII-only

@Qwerp-Derp Well yeah but how often do you really need to use them

Also you need to be really careful to write a good parser otherwise the regex will take like 1 second just to parse

Mayube

use regex to parse your regex

so you can regex while you regex

Qwerp-Derp

@Mayube "Hey dawg, I heard you like regex"

@ASCII-only How should I go about making a regex parser thing?

Mayube

@Qwerp-Derp Step 1: don't

ASCII-only

10:23 AM

@Qwerp-Derp wait what why are you asking me

Qwerp-Derp

IDK, I just thought you can help

Lembik

If I have the finite field F_p for prime p, how hard is it to find a primitive element?

ASCII-only

@Qwerp-Derp Well I'd just use Jison because it's fast :P

Qwerp-Derp

So I'm using a parser engine, which uses regex, to parse regex?

What

ASCII-only

@Qwerp-Derp Yes because using regex is faster than using a JS lexer

Qwerp-Derp

10:32 AM

But I'm going to be using this regex for a parser engine

So I'm using a parser engine (Jison), which uses regex (JS regex), to parse regex (my regex), which I'm going to use to make a parser engine (my parser engine)?

Regex-parserception

ASCII-only

@Qwerp-Derp Yep

Lembik

maybe it makes a good code-golf question :)

Qwerp-Derp

That seems like an awful idea on paper, but it might work

ASCII-only

But seriously? Jison is a shift-reduce parser generator = super fast, I don't see why you'd want yet another layer of abstraction

@Qwerp-Derp Well VSL uses nearley, which is bootstrapped

beat that :P

Qwerp-Derp

Let me make a diagram real quick

Regex (JS regex) -> Parser (Jison) -> Regex (Dart regex) -> Parser (my own parser)

It should be fine with Dart, right?

ASCII-only

10:36 AM

@Mayube :| I feel like opening up like a million issues on arcplus' repo

@Qwerp-Derp ._. how does Dart make this fine

Qwerp-Derp

Didn't I tell you I'm doing this in Dart?

Let me rephrase: Jison should be fine with Dart, right?

ASCII-only

@Qwerp-Derp Well webdev.dartlang.org/guides/web-programming#js-interop

pub.dartlang.org/packages/js

Mayube

@ASCII-only arcplus doesn't have a repo

also I'll probably close half of them with the response "No C:"

ASCII-only

@Mayube :(((

Mayube

@ASCII-only if you'd like, I can move arcplus to it's own repo, and you can spam all the issues and even PRs you'd lke

Shaggy

10:42 AM

0

A: Sandbox for Proposed Challenges

It's Hip to be Square! code-golfmath Meta Is this a good challenge? Is it a dupe? Would it add anything to the challenge if, instead of reducing the array by addition, I alternated between adding & subtracting each integer? Any suggestions for test cases? Tag suggestions? ...

Mayube

I'll even genuinely read and maybe consider each one

Shaggy

Looking for some more feedback on that, please.

So, both FryAmTheEggman and @Mayube have mentioned that we don't have a code golf challenge asking if a given number is a perfect square. Is that true? Can someone provide a link if not? If so ... dibs!

Mayube

quickly goes to post it before you have the chance to

@Shaggy only one I can find is Sqrt without Sqrt which is considered a duplicate of Sqrt without Sqrt which was closed for being unclear

Shaggy

@Mayube Yeah, and there are a couple of others that ask the same with other shapes or multiple shapes.

Mayube

There's Is this a triangle number? which I remember solving about a month ago

Shaggy

10:57 AM

And there's this one‌.

Kritixi Lithos

TFW you finished your exams and you're like "SE 24/7"

Shaggy

11:10 AM

Hmm ... I'm going for it, if it's dupe-hammered, so be it.

J Doe

Thanks to your doc @LuisMendo I thought since ~0 is a logical ~0: converts 1 to a numerical vector. I guess that’s why 0X#~X#:X# is different from 1X#:X# (input shifts to the left in the stack when logical)?

New Meta Posts

0

Q: Can a specification define a language?

The current meta consensus is that the implementation defines the language. The cannonical answer is: What's the policy on interpreter bugs? I think this is too rigid: I think that a specification should also be able to define a language, if and only if the specification is sufficiently rigorous...

discussion specification

Shaggy

0

Q: It's Hip to be Square

Challenge So, um, it seems that, while we have plenty of challenges that work with square numbers or numbers of other shapes, we don't have one that simply asks: Given an integer n (where n>=0) as input return a truthy value if n is a perfect square or a falsey value if not. Rules You may ...

code-golf math

Huzzah, my first challenge, at last!

Erik the Outgolfer

usually we wait for nmp insteaed of oneboxing ourselves...

...otherwise nmp might complain

Kritixi Lithos

@EriktheOutgolfer ninja'd me by 5 seconds

Erik the Outgolfer

11:22 AM

the nmp thing or the Jelly thing?

Kritixi Lithos

Jelly

Erik the Outgolfer

oh...I cared to be tremendously fast because of trivial challenge

Kritixi Lithos

it's also trivial in Retina

New Main Posts

0

Q: It's Hip to be Square

Challenge So, um, it seems that, while we have plenty of challenges that work with square numbers or numbers of other shapes, we don't have one that simply asks: Given an integer n (where n>=0) as input return a truthy value if n is a perfect square or a falsey value if not. Rules You may ...

code-golf math decision-problem