The Nineteenth Byte - 2017-12-02

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12:19 AM

@Challenger5 I think weave.rb does

12:33 AM

hello

waiting the challenge I posted in the sandbox just now falls here in the chat

\o

o/

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

2 factors factorization Given a natural number n write a program or function to get a list of all the possible two factors multiplications that can be used to achieve n. To understand better what is pretended you can go to http://factornumber.com/?page=16777216 to see when n is 16777216 we get t...

12:49 AM

@sergiol You may want to change pretended by wanted, sought, or The purpose here is...

Who summoned Pseudohuman?

I think for my Advent Challenge Series maybe I should've made the first one slightly easier :P

@Potato44 Cool. Thanks!

7 hours later…

8:21 AM

0

Q: There's no such thing as a "half empty glass"

You probably know the rhetorical question of whether a glass is half full or half empty. I'm getting a little tired of the phrase, so I decided that it's time to eliminate this confusion about glass fullness or emptiness programmatically. Your task is to write a program that takes an ASCII art r...

code-golf ascii-art

2 hours later…

10:20 AM

Does anyone know what this is supposed to mean?

Mark My Mail, Mark Hamill! (No, it doesn't make any sense. I just wanted to say that.) — Arnauld 4 mins ago

o/

2 hours later…

12:21 PM

it.m.wikipedia.org/wiki/Mark_Hamill

12:33 PM

0

Q: Itsy Bitsy Coins — (Golf Bitcoin Private Keys)

CodeGolf Challenge Bitcoin private keys are easy to generate but typically are done with libraries and numerous lines of code and lots of imports, though they don't need to be. Given that the currency has 'bit' in its name, let's see who can generate private keys (and public pairs) using the lea...

code-golf cryptography hashing bitcoin

Simply Beautiful Art

1:11 PM

Can a==0||b==0 be shortened in Ruby?

Does Ruby has bitwise or or auto int->bool (or bitwise not in 1 byte)?

@SimplyBeautifulArt a*b but may not work for your use case. Also I don't know ruby

Simply Beautiful Art

Oh, a is guaranteed to be integer, but b may be an array

How can an array == 0???

Ruby isn't strongly typed

Simply Beautiful Art

1:14 PM

It may be an array.

b = []
b = 0

both valid

Simply Beautiful Art

But it may be an integer.

If it's b is an array, then b==0 will return false.

So not sure how. If both are integers !(a&b) or a*b==0 should work. Otherwise probably !(a!=0!=b) if Ruby supports chained comparison. (this isn't shorter, actually)

tio.run/##KypNqvz/P9HWkCvJNjqWq0BDUSNR0dZA0TZJU8HeyMpA8/9/AA I'm going to go with "Ruby doesn't support chained comparison"

Simply Beautiful Art

It does, but it will evaluate a!=0!=b as a!=(0!=b)

1:17 PM

So it doesn't.

Simply Beautiful Art

Okay, then it doesn't :P

We could try checking if 0 is in [a,b]

But that's probably not shorter

caird coinheringaahing

1:54 PM

@HyperNeutrino I think that was me, about 3 weeks ago :P

Yep, here we go:

in Sandbox, Nov 23 at 14:45, by caird coinheringaahing

~$joinroom 240

@cairdcoinheringaahing I just made it leave

caird coinheringaahing

@Mr.Xcoder Yeah, just saw :P

2 hours later…

3:37 PM

"KEYWORD hard" for the next sequence :( — Giuseppe 22 hours ago

Is it supposed to mean "hard to implement"?

caird coinheringaahing

4:21 PM

@user202729 Maybe hard to calculate, which would imply hard to implement

New Sandboxed Posts

4:44 PM

0

A: Sandbox for Proposed Challenges

Parenthesize APL trains code-golf apl balanced-string In APL, you can write tacit functions, called trains. How they work is irrelevant for this challenge. Here are the different ways they can be grouped, using ⍴ as the function: -> ⍴ -> ⍴ ⍴⍴ -> ⍴⍴ ⍴⍴⍴ -> ⍴⍴⍴ ⍴⍴⍴⍴ -> ⍴(⍴⍴⍴...

Quick question: Given two lists, what's the most Pythonic way to get values present in both lists?

caird coinheringaahing

@NieDzejkob If order doesn't matter, lambda a, b: set(a).intersection(set(b))

Whoops, wrong set command

@cairdcoinheringaahing thanks!

Erik the Outgolfer

@cairdcoinheringaahing and for golfing you can do set.__and__ or lambda a,b:set(a)&set(b)

4:59 PM

uh, any idea what 2 || integer_variable is supposed to mean?

caird coinheringaahing

In Python?

Erik the Outgolfer

what language?

python doesn't have ||

uh, it's Proton, but it seems to be the same as Python's or...

Erik the Outgolfer

ask Hyper :p

caird coinheringaahing

Yeah, but 0||<value> isn't a syntax error, but 0or<value> is

Plus, I'm guessing that and is &&, so it's fitting with that theme

5:01 PM

@HyperNeutrino you should know :P

@cairdcoinheringaahing 0o is the octal prefix.

caird coinheringaahing

@Mr.Xcoder Yeah, so 0or is invalid syntax IIRC

Indeed. You must do 0 or

caird coinheringaahing

So having or as || makes sense for golfing

@NieDzejkob I wouldn't bet on it :P

@Mr.Xcoder JHTBot can now run Jelly :P

Really? That's incredible

brb

5:05 PM

HOW ON EARTH IS THIS SUPPOSED TO BE EVEN MILDLY INTUITIVE

caird coinheringaahing

@NieDzejkob x divides y is a good builtin

Erik the Outgolfer

@NieDzejkob calm down ;)

how is || supposed to mean divide?

caird coinheringaahing

It comes from APL/J IIRC

@NieDzejkob The worse problem is the use of _ as a main function name :P

@NieDzejkob How's the OEIS one going?

I might use Gaia / Ohm / Actually next

5:11 PM

@Mr.Xcoder I've almost finished my Python "draft"

@NieDzejkob In mathematics, x|y means, x divides into y

@Sherlock9 oh, I'm used to my teacher writing it more as a /

Since | is already taken, I will happily accept that modification of mathematical notation for a good builtin

Fair enough, but my philosophy is that strangeness almost never warrants all caps

I do forget this when I spot what I think is a typo, instead of just something new to me

@NieDzejkob / is divides, | is divides into

x|y means that x%y == 0

(or y%x == 0, idr)

The latter (y%x == 0).

5:21 PM

(thanks)

Wow, no CMC in 24 hours

@Riker how is that different?

caird coinheringaahing

CMC: Fix JHTBot :P

CMC: Given (the integers) X and Y, return [Y, X, Y]

(note: very biased towards Jelly and 05AB1E)

@Mr.Xcoder Python 3: lambda x,y:[y,x,y]

caird coinheringaahing

5:24 PM

@Mr.Xcoder Jelly, 3 bytes: ,U;

@Mr.Xcoder Forth: TUCK (for some definitions of a list)

05AB1E: .ø (outputs as a string)

caird coinheringaahing

@Mr.Xcoder Jelly, 2 bytes: ŒB. Takes input as [Y, X]

@Mr.Xcoder SOGL, 2 bytes: ⁴⁰

MY, 6 bytes: αωα;;←

5:27 PM

if the output can be separate items on the stack, ⁴ is enough

Ok, let's get something a bit harder. CMC: Return all the elements of an array of integers which are different than both their neighbours if they are in the middle, or different than their only neighbour in case it's the last/first element

That would make a nice challenge, wouldn't it?

@LuisMendo Really?

Erik the Outgolfer

@LuisMendo looks somewhat dupe-ish to me

^^ I think so, yes. At least, I like that kind of challenges

5:32 PM

@NieDzejkob it's a bool, not a float

it's not really an "operator", any more than "==" is an operator

I have a related challenge

Ah, maybe too similar, yes

this is simpler, but I don't think it is different enough

@Riker so a | b is b % a == 0, but is a / b in math the same as a / b in e.g. Python?

caird coinheringaahing

@NieDzejkob Yes

5:36 PM

@cairdcoinheringaahing wasn't : division?

It is, but most of the mathematicians and Physicists use fractions

caird coinheringaahing

@NieDzejkob In Jelly

Don't know about anything else :P

heh

@cairdcoinheringaahing I guess different countries have different standards

What does Jelly have to do with countries :P

5:37 PM

and my teacher is always talking about how universal the math notation is

@Mr.Xcoder I think tdThTGPdPh*g) (MATL) does the job

Nice. I'll try Pyth

@Mr.Xcoder Poland uses a : b as division and if you try to use /... no one even tries

caird coinheringaahing

@LuisMendo MATL is very powerful when it comes to arrays/matrices isn't it? :P

@NieDzejkob We never use /

caird coinheringaahing

5:39 PM

We use either use ÷ or /

@NieDzejkob Well, Poland is home to some weird notations.

@Zacharý for example?

@cairdcoinheringaahing Not sure how powerful, but most operations are array-oriented, which may give an advantage sometimes. For example, + applied to two arrays adds matching entries, or applies broadcast like Numpy's arrays

@NieDzejkob Polish reverse notation... Like 2 5+

@Mr.Xcoder s/reverse//

5:40 PM

nah

Polish notation without parentheses, I mean

@Mr.Xcoder That is not that weird, but (2 5 +) would be sorta weird

@Mr.Xcoder it's called that because a Polish mathematician invented it (for his own amusement IIRC), but I didn't even know about it until I saw the computerphile video about postscript

@Zacharý sort of

@Zacharý you are a step away from reinventing Lisp

Circumfix notation for everything +2 5+

5:43 PM

Please, no, no... no Circumfix

@NieDzejkob The reason I didn't say (+ 1 2) is weird is because of Lisp.

@Mr.Xcoder Some circumfix, of course: |a+2|.

;-; awful

@Zacharý also, parenthesis

@NieDzejkob Technically yes.

Hey, we're reinventing Perl operator overloading here! (And Fortress)

perl isn't the only one to have overloading I don't think

5:48 PM

@Riker Overloading like Perl does, the only other thing that comes to mind is Fortress, honestly. What other language lets you create prefix, postfix, infix, circumfix, postcircumfix, and precircumfix operators?

@Zacharý precircumfix? postcircumfix?

caird coinheringaahing

||a+2| and |a+2|| :P

@Zacharý R

Precircumfix: F[A,B], postcircumfix [A,B]F. Might have misremembered which ones are which

@Riker Example?

can't right now, don't have R installed

just google R operator precedence definitions or something

5:53 PM

Response to CMC: Dyalog APL, 25 bytes: {⍵/⍨{(⊢≡∪)⍺↓⍵}⌺ 3⊢⍵}

Erik the Outgolfer

@Zacharý 25

you need a space before the 3 in Classic

@EriktheOutgolfer That's a poor design choice, honestly: just add a space when transliterating

Erik the Outgolfer

@Zacharý not in Unicode :p

but in classic it would appear like this

{⍵/⍨{(⊢≡∪)⍺↓⍵}⎕U90183⊢⍵}

obviously you can't make out that the 3 is separate

Okay, I think I get it now.

Erik the Outgolfer

note that in Unicode, since that clashing won't happen (⌺ isn't an identifier char), you don't need the space

5:59 PM

Wait, does it transliterate like that inside of strings too?

Erik the Outgolfer

well

Classic can still read Unicode chars and it transliterates them automatically

but no, it's not transliterated in strings

That ... seems reasonable.

@EriktheOutgolfer but in Unicode almost every char is 2 bytes

Erik the Outgolfer

@Uriel that's why we use Classic instead ;)

Yep.

6:19 PM

@Mr.Xcoder APL (Dyalog), 3 bytes: ⊢,,

65000 characters better Unicode char 16 bit

@EriktheOutgolfer Yes it does. While it may mess things up, the alternative is TRANSLATION ERROR.

@Adám Wait ... what?!

@Zacharý Try it online!

Erik the Outgolfer

@Adám sick

6:25 PM

@EriktheOutgolfer If by sick you mean diseased.

@EriktheOutgolfer now tha'ts an expression I haven't heard in a loonng time

Don't you mean ulong? (Okay, I'll stop)

@EriktheOutgolfer What would you rather it should do? It will work in most cases. E.g. old school ⍎Bool/'fn⍤2⊢array'

Erik the Outgolfer

@Adám well, I'd rather it shouldn't transliterate in strings, while ⍎ should do the job instead

@EriktheOutgolfer Uh, how? What exactly would you expect ⍎ to receive as argument?

Erik the Outgolfer

6:28 PM

@Adám the string itself

@EriktheOutgolfer How do you expect the interpreter to store ⍤ in 8 bits?

^

Erik the Outgolfer

@Adám oh it must store it in 8 bits? hm

@EriktheOutgolfer Isn't that like the whole point of Classic?

@Adám Yep

Erik the Outgolfer

6:30 PM

@Adám hm, I thought it only used the encoding for the code, not strings

and since it can read Unicode chars, then maybe that would represent a string literal as-is without transliteration

@EriktheOutgolfer The code is tokenised. It is exactly the characters which are 8 bits each. However, if you try to load a Unicode file, we do the best we can.

@EriktheOutgolfer You mean garble?

0

Q: Calculate the lowest number where the sum of the sequence of numbers exceeds a given value

Given you have an infinite sequence of numbers defined as follows: 1: 1 = 1 2: 1 + 2 = 3 3: 1 + 3 = 4 4: 1 + 2, 4 = 7 5: 1 + 5 = 6 6: 1 + 2 + 3 + 6 = 12 7: 1 + 7 = 8 ... The sequence is the divisors of n, including n. Calculate the lowest number (n) which will produce a result of over x Test...

@Adám Mojibake, maybe?

@Zacharý Not really. That's when Unicode encoding/decoding is done twice, iirc.

@Zacharý You can get the raw 8-bit chars with ⎕NREAD.

@Adám IIRC, then it's when it tries to read it as a different character encoding than it actually is.

6:38 PM

@Zacharý You can do that with ⎕NGET by overriding its heuristic.

@HyperNeutrino in Proton, is some_list[int1, int2] equivalent to (some_list[int1], some_list[int2])?

Or some_list[int1][int2]

@Zacharý context says this is unlikely

What context is this you speak of>

6:54 PM

@Zacharý I'm trying to understand a proton program

@Zacharý "contextual clues" might be clearer

Which program?

If you posted a link earlier, I think it is now lost in the transcript

Wait, how many ~~Adám-ic~~ atomic theory based languages does he have now

@NieDzejkob I understood what you meant, but where is the context? Where is the code?

HyperNeutrino's solution to A000109:
https://tio.run/##tVdNb@M2ED1bv2KAHpaqFcOWdy/pusAee9lTb4IOjMzItGxKlqhGbje/PZ0hKUqWHadAWyCxxfme4XsUXdWlLtXb20/w@042oMuygKOAUyu1AA4vO3kQKIWXGgW/gHwGqT81uCxVHkF1ELxBvTgcyIurLfz2CZ91fSanZ9mhObxIvStbDdmOq1yqHPROwNMZE2Rlq/RiEQSVqI@t5lqWqoENdLD5Ff4KZpjuIBTrQthsYAm10G2tIIF0olp5VYeqWjTtQWOYBBfPZQ1SbUUHj1BjfsGsW0jxjXaUG23GlbAuwS6Mdwpz6BIbaI75dJnaCC7bgleVUFuWOKOUHEaxQjR9DejPVWrdgtcg4Ns9z4TKzlhxds4OonHd9wsnxVqwn0b@KbxoUZUVw9BHrmucNXacLFP4GYyR6dx3TaLQzcM4o8YloDZkBPsIij4yhonc08o/xejuUiUyTfYpWg/LYrTcpyi5WI61xaW2cKFW4/FYHY1HY/0NVn1EE06TSRLuElAv@4t95SgOw3TSu9GgOAhkUx7Lut…

I was summoned?

@Zacharý Was I?

6:57 PM

@NieDzejkob Yes.

Actually, it's equivalent to [some_list[int1], some_list[int2]], but close enough :P

@Adám Was referencing the fact of how you program APL, and the feature in question is an array oriented thing. (Basically a pun). And I didn't ping you.

caird coinheringaahing

@Mr.Xcoder Sorry about your Pyth answer :/ I knew there was a reason why Pyth beat Jelly :P

@cairdcoinheringaahing Don't be sorry, I am trying to outgolf you now :P

caird coinheringaahing

@Mr.Xcoder Jelly or something else?

Both.

caird coinheringaahing

7:03 PM

ಠ_ಠ

@cairdcoinheringaahing Don't start

caird coinheringaahing

@Zacharý Start what?

@cairdcoinheringaahing Done.

caird coinheringaahing

@Mr.Xcoder It's one byte, you could just suggest an edit :P

I use nfind :P

7:06 PM

ಠ_ಠ

caird coinheringaahing

I know, I saw it :P

@Mr.Xcoder Why'd you delete it?

Never mind

so many identicons D: :P

caird coinheringaahing

@Mr.Xcoder Jelly will rule the (golfing) world! :P

+1'ed now

caird coinheringaahing

@Mr.Xcoder Thanks

7:08 PM

@cairdcoinheringaahing don't edit-suggest golfs

caird coinheringaahing

@Riker As in comment below to suggest a golf. Xcoder can't suggest edits :P

github.com/alexander-liao/christmas-tree :D

caird coinheringaahing

Someone should make a PR to implement Pyth's version of f in Jelly

@cairdcoinheringaahing MWHAHAHA I tied you in 05ab1e

caird coinheringaahing

@Mr.Xcoder ¯\_(ツ)_/¯

7:28 PM

@cairdcoinheringaahing BTW your previous version failed for 1

Simply Beautiful Art

Is it acceptable to post questions which ask how to golf a specific piece of code in a particular language under some restrictions?

Yes it should be

Simply Beautiful Art

K

Ruby I guess?

Simply Beautiful Art

ofc

caird coinheringaahing

7:29 PM

@SimplyBeautifulArt Yes, but only if well-written and understandable. Basically the same as most Q&A sites

^

Simply Beautiful Art

:P yeah yeah, that's a given

Erik the Outgolfer

@SimplyBeautifulArt those are tips questions btw

Simply Beautiful Art

ah, thnx

:| What to title it

caird coinheringaahing

How to improve Ruby code to <summary of task>

Erik the Outgolfer

7:33 PM

s/to/for

caird coinheringaahing

@Mr.Xcoder Nice solution, that's a very good Jelly program :P

:P

Then may I ask for feedback on this Jelly answer? codegolf.stackexchange.com/a/149664/47581

1

Q: The Microwave Challenge

Inspired by this comment. Input The number of seconds on the timer. Output Here's our basic microwave: _____________________________________________________________ | | ___________ | | | | [display] | ...

code-golf ascii-art date

caird coinheringaahing

@Sherlock9 Huh, that is one of the first answers I've seen where the [] are necessary

7:43 PM

Yeah a same byte alternative could be (base 250 for 72)D(bit shift)@

On mobile so I can't find the bytes right now

caird coinheringaahing

@Sherlock9 72 is the shortest version of 72 to get in Jelly

Erik the Outgolfer

@cairdcoinheringaahing I don't think so?

caird coinheringaahing

@EriktheOutgolfer Removing them (and don't change anything else) makes it invalid

Hmm. Let me try that then

Erik the Outgolfer

um, no?

caird coinheringaahing

7:47 PM

Huh, weird. I could've sworn it didn't work for me

Well, I'll be darned

0

Q: How to improve Ruby code under some restrictions

I'm (still) trying to make another submission to the Largest Number Printable question, and I've got the following bit of code: f=->a{b,c,d=a;b ?a==b ?~-a:a==a-[c-c]?[[b,c,f[d]],~-c,b]:b:$n} h=[],$n=?~.ord,[] h=f[h]until h==p($n+=$n)-$n The conditions I'm working with: Maximum 100 bytes. No ...

code-golf tips ruby

@HyperNeutrino I have a pretty good reason to believe your last Proton answer to the OEIS challenge (A000109) is not working correctly for n=7 (input 4). I'm currently running it on my computer since TIO timeouts, but there's probably a huge potential for a simple optimisation - when I ported the permutations function to python, I wanted to test it, and then I realised that it's 20 times slower than itertools.permutations. I don't know Proton so I'd need you to replace it

caird coinheringaahing

8:02 PM

@NieDzejkob This one?

@cairdcoinheringaahing yup

caird coinheringaahing

@NieDzejkob Fingers crossed that Hyper can fix that :P Otherwise that's ~60 answers invalidated

@cairdcoinheringaahing yup

@EriktheOutgolfer Before I forget, thanks for the tip. Will post it soon

@cairdcoinheringaahing I have credited you as well for your help. Thank you

caird coinheringaahing

8:24 PM

@Sherlock9 No problem

8:34 PM

wait, it's not input 4, it's input 5

8:56 PM

1

Q: Advent Challenge 2: The Present Vault Raid!

Advent Challenge 1. Challenge Now that Santa has finally figured out how to get into his present vault, he realises that somehow the elves got in there before him and stole some of his presents! They haven't figured out how to leave the vault yet though, so Santa has to try and catch them all. ...

code-golf graph-theory

@HyperNeutrino sorry to ping you again, but is this supposed to happen?

@Fatalize I'm trying to solve this challenge in Brachylog, but my attempt times out. Do I need to insert ≜ somewhere, or what's happening?

9:36 PM

@Zgarb [§,ḟV](tio.run/##AR8A4P9odXNr///CpyzhuJ9WPuKBsG1vzqPhuIpO////MTAw) works :)

9:47 PM

@BruceForte Yeah, that's weird too.

I might look into it tomorrow and see what the incorrect program actually does.

But maybe this kind of weirdness is expected when one applies combinators to higher order functions. :P

I should definitely check out the source one day.. I have no idea what Husk really does in the background

Well nothing wrong with using combinators :)

10:23 PM

0

Q: 2 factors factorization

Given a natural number n write a program or function to get a list of all the possible two factors multiplications that can be used to achieve n. To understand better what is pretended you can go to http://factornumber.com/?page=16777216 to see when n is 16777216 we get the following list: 2 ...

code-golf math arithmetic integer

caird coinheringaahing

For anyone who wants to, I invite you to try to break my chat bot over in the Sandbox. Ping it with @JHTBot <command>

@cairdcoinheringaahing What does/can it do?

caird coinheringaahing

@Adám It's basically a tool for learning Jelly. Type @JHTBot help for help

Simply Beautiful Art

What do you guys get when you run this?

caird coinheringaahing

@SimplyBeautifulArt The output?

Simply Beautiful Art

10:30 PM

I think I broke it

caird coinheringaahing

81
6561
43046721
1853020188851841

Simply Beautiful Art

:-/ I get weird stuff at the bottom

@SimplyBeautifulArt runs for a long time…

Simply Beautiful Art

yeah ik

That's how most of my programs work ;P

.code.tio:3: [BUG] rb_gc_mark(): 0x00559b2860fea0 is T_NONE
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-linux]

Is that something to worry about?

@cairdcoinheringaahing You know SocraticPhoenix has made a generalised TIO bot which you can program (from inside the chat room) to your needs ?

caird coinheringaahing

10:33 PM

@Adám Yes, but that's not tailored for learning Jelly

@cairdcoinheringaahing So JHTBot does something more than just TIO evaluation? We just use a set up TIOBot for learning APL.

caird coinheringaahing

@Adám Yeah, for instance @JHTBot code page will post the code page, or @JHTBot describe <command> will describe the command

@cairdcoinheringaahing I have a code page command too, but we can't have describe command yet. Actually, we can, but it would be quite some work to set it up. Hm, maybe I should…

caird coinheringaahing

@Adám Yeah, the fact that all the commands are available in the same format on the Jelly wiki helps

Maybe crawl TryAPL?

10:43 PM

@Zacharý I have access to our sources.

That works better.

1 hour later…

11:51 PM

antarcticfire.org

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The Nineteenth Byte

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