The Nineteenth Byte - 2016-06-25 (page 4 of 4)

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7:00 PM

1

Q: Should we change "Question" to "Challenge" in meta tags?

I just realized that on meta, we have lots of tags about asking questions, and very few tags about challenges. For example: asking-questions, questions, specific-question closed-questions, deleted-question and unanswered-questions (which ironically has no questions tagged with it). These tags c...

discussion tags tag-synonyms retagging

@Maltysen Your Project Euler friend key.

El'endia Starman

@Maltysen If you add someone using their friend key (visible by logging in and clicking on the Friends tab), then you two can see what problems the other has solved.

did not know that was a thing

is each like only usable once?

El'endia Starman

No, I don't think friend keys are a one-time use sort of thing.

@Maltysen It's multiple use.

7:01 PM

wonder why it has a generate new button then, shrug

711987_ywakdvOBst5pnw3nDkZ3IFPNeT9vpvE8

El'endia Starman

@Maltysen I dunno either.

@Maltysen Welcome to my list of friends!

@zʏᴀʙiɴ101 hello

You share 3 problems with me.

El'endia Starman

> However, if you have removed a friend and he/she still has your private Friend Key then he/she could enter it again and rejoin your list. In such cases you can click the "Generate New Key" button and this will make your old key invalid. Note also that generating a new key will not remove friends on your current list which used the old key.

7:05 PM

flawr added me to my friend list.

@flawr We share 3 problems.

What's this

@quartata projecteuler?

PE has become a social network?

Apparently, a large amount of my friends share 3 solved problems with me.

Didn't know about that

7:07 PM

@quartata Wanna add too?

@quartata A small pinch of social was added.

@flawr no my pe account is ancient and has my real name

Anyone here scottish?

@HelkaHomba I'm Russian.

@quartata you can change your name

7:10 PM

So no.

El'endia Starman

@zʏᴀʙiɴ101 Well, how many problems have you solved? :P

@Maltysen You can?

@El'endiaStarman 3 problems.

@quartata account tab

Oh.

El'endia Starman

7:12 PM

@zʏᴀʙiɴ101 I'll bet the majority of your PE friends have solved more than 1, 2, and 6. :P

I solved over 100 just so I could say so :P Though I reckon some people here have done many more

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I am just starting to do PE again

@HelkaHomba I need to verify. What is your friend key?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

"17 Number letter counts" is now my least favorite PE

Mine is 984845_ZyZsjOswfqoDY3I5UKtDW8cDaXDhfg9m

7:18 PM

I did 29 before I got bored with it, apparently.

muddyfish got added to my friend list.

@muddyfish We share 3 problems.

@zʏᴀʙiɴ101 I seem to recall I ran into this issue - projecteuler.net/about=account_recovery

So we do

I registered before 2014, lost my pw, and now there's no way to get it back

@HelkaHomba Not even the account recovery by "euler"?

7:21 PM

> NOTICE: This service is suspended.

@HelkaHomba I thought I would have that problem, but apparently Chrome remembered it for me just now. It made me change pw upon logging in though.

My campaign of a rubber duck as a picture on the screen is ongoing.

El'endia Starman

@HelkaHomba I've done 135 and I have a PE friend that has solved 210, though I don't remember who they are IRL anymore.

in Sandbox, 2 hours ago, by zʏᴀʙiɴ101

+-+-+-+-+         0 - NotPunchedYet
|0█████3|         1 - ProgramFOX
+-+-+-+-+         2 - DanPantry
|4|5|6███         3 - NotPunchedYet
+-+-+-+-+         4 - NotPunchedYet
|8███A|B|         5 - NotPunchedYet
+-+-+-+-+         6 - NotPunchedYet
███D███F|         7 - FOX9000
+-+-+-+-+         8 - NotPunchedYet
9 - FOX9000       A - NotPunchedYet
B - NotPunchedYet C - DanPantry
D - NotPunchedYet E - ProgramFOX
F - NotPunchedYet

Cᴏɴᴏʀ O'Bʀɪᴇɴ

?

7:26 PM

in Sandbox, 2 hours ago, by zʏᴀʙiɴ101

I have a rubber duck. I'm going to give it away to the person who guesses the right hexadecimal digit.

Apply in the Sandbox.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

is it a real ducK? o_O

@CᴏɴᴏʀO'Bʀɪᴇɴ Nope.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I'm confused

It'll be provided as a picture on the screen.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

oh

7:27 PM

user image

3

saved you the trouble @zyab

@HelkaHomba Wow, so cool! So large!

Dr Green Eggs and Iron Man

Anyone in here good at ruby + optparse?

@DrGreenEggsandIronMan I'm good at python + pip.

So no.

Dr Green Eggs and Iron Man

:/ I'm really bad at ruby.

I just randomly decided to do a project in it.

El'endia Starman

@DrGreenEggsandIronMan Everyone's bad when they're just getting started.

7:37 PM

@DrGreenEggsandIronMan Nope

Anyone noticed, how similar javascript's syntrax is to most pseudo-code's?

I think that more of python...

Dr Green Eggs and Iron Man

^

Although I think people write psuedocode that is closest to the language they're most comfortable in.

I know I do.

@DrGreenEggsandIronMan My challenges are secretly English pseudocode that I get you guys to program.

Dr Green Eggs and Iron Man

That's pretty verbose for english psuedocode. You should try golfing it further.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

7:55 PM

@Bálint s/javascript/any language that isn't java/

:P

I think reading through J for C is a good way to start learning J.

@CᴏɴᴏʀO'Bʀɪᴇɴ WHat is this s/thing1/thing2?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Bálint replace thing1 with thing 2

@miles A good way to start learning J for C programmers. I'm not sure you know C.

Dr Green Eggs and Iron Man

I know C. Thanks Miles!

8:01 PM

It's hardly required to know C, it's more about using the typical C-style program in J

It's meant to progress from an iterative style to an APL style

There should be a Try it online! for J.

tryj.tk might be going down soon, because it might be using Google Drive.

And Google Drive is shutting down its web server service at August 31, 2015 for Google Drive users, and August 31, 2016 for Google Apps users.

Dr Green Eggs and Iron Man

@Dennis Could you add BrainFlak to TIO? Installation is pretty straightforward. Encoding is just plain ASCII, no dependencies, and it's called with ruby brain_flak.rb source.brack -f input.txt

@DrGreenEggsandIronMan *.brack?

Dr Green Eggs and Iron Man

File extension is arbitrary.

Attention programmers: you are supposed to tell the duck your problems. Do not rub the rubber duck. It is not a lamp; there is no genie.

Tweeted by shog9 on February 24, 2016 at 3:50 PM

Dr Green Eggs and Iron Man

8:12 PM

Here's what brain-flak code looks like:

(<>)<>(({})){({}[])<>(())<>}{}({}<(({})){({}[])(<>)<>}{}>)(()){({}<(({})){({}[]‌)<>{}<>}{}>)<>{<>({}[])(<>)}<>}({}<({}<{}>)>)<>{}{({}<>)({}{})<>}{}<>(({}<(({}))>‌))({}<({}<>)<>({}<><({}<>)>)>){({}[]<({}[])>)}{}(({})){{}{}(<><>)({}<({}<(())>)>)‌}{}({}<{}{}>)<>{}<>

That's modulus.

([{<>}])

Dr Green Eggs and Iron Man

That would print 0 0 I believe.

Yep, 0 0, just tested it.

8:31 PM

Today I discovered visual-recognition-demo.mybluemix.net

0

Q: Flood-fill a 2D grid

Challenge description Let's call a two-dimentional, rectangular array (meaning its every subarray has the same length), a grid. Every unit of a grid is either an empty space or a border. In a grid of characters, empty space is represented by a single whitespace; any other character is treated as...

code-golf array-manipulation grid

That washingtonpost article wasn't lying

google.com/trends/…

This is just pure stupid

It's interesting, to check out some google trends

Hey everyone here, I'm thinking of a new code-golf and would like to ask the people with more overview than me here: Did you already had one which asked you to implement a classic list-filter with the twist that you drop everything starting with the first false predicate evaluation ?

El'endia Starman

With a statement such as -x * y - z, should the first - be applied to x or to x*y?

@El'endiaStarman in normal math? to x*y

8:42 PM

@El'endiaStarman Is there a difference?

@El'endiaStarman I must admit I can't think of values for which there would be a difference

ninjad

well I guess there's a difference if you are outside of classic math definitions...

El'endia Starman

Yeah, there isn't a difference using typical values/types, but suppose someone implemented a new class that behaves weirdly such that -(x*y) != (-x)*y.

Oh, replace * with ^ (power, not xor).

@El'endiaStarman C/C++ would eval -x * y to -(x*y) IIRC

oh sorry, I justed looked it up

unary minus has priority over multiplication in C/C++

El'endia Starman

Hmm. I'll bet part of the difficulty is that -x could mean either 0-x or (-1)*x.

8:49 PM

so your example would evaluation (in C++) to ((-x)*y)-z

El'endia Starman

Okay, that's helpful. Sorta.

@SEJPM like a takewhile function?

@flawr yes

El'endia Starman

Reason I'm asking is that I'm trying to come up with a clear idea for how to handle operators with the same name but different numbers of arguments and different precedences (for implementation in Pytek).

@SEJPM I don't think so. But then again I think it is trivial in most languages.

8:52 PM

@flawr ok, then I'll have to combine it with a medium-complex predicate to get an interesting (short-resulted) challenge :)

@El'endiaStarman Implement operating overloading in such a way that you can overload the precedence rules too. It will be a thing of beauty...

El'endia Starman

@trichoplax Operators composed of symbols will be executed according to methods of the classes they're operating on, so if you want to overload +, you just define ._add_() in your class (subject to change). On the other hand, you can define new word operators, including name, number of left and right arguments, precedence, and whether to evaluate from right to left (as in the case of exponentiation).

I was joking about overloading the precedence of well known operators - it would be horribly painful to program with... :)

9:16 PM

Wankelmut & Emma-Louise - My Head is a Jungle (Official Video HD)

9:28 PM

@Maltysen informal is intentional

They've already been seen as rules by some people, which is not the intent

k

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Don't even think about non-42-related numbers! code-golf math fibonacci Introduction and Credit We all love our Answer to the Ultimate Question of Life, the Universe, and Everything which, of course is 42. So let's take this unworthy Fibonacci-Sequence thingy and adapt it to be worthy of 42!...

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I still ಠ_ಠ at removing the quote.

Are you CᴏɴᴏʀO'Bʀɪᴇɴing me?

Dr Green Eggs and Iron Man

@newSandboxedPosts At this point, we should consider adding a 42 tag.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

9:32 PM

@ಠ_ಠ Yes I am, puppet.

@ಠ_ಠ \o/ You returned!

Well, this is creepy: ( ͡°͜ ͡°)

2

The new Chattiquette a bit deprecates you:

Dr Green Eggs and Iron Man

@ಠ_ಠ Your username is fun to ping.

> Post messages that add nothing to the conversation (^, ಠ_ಠ, rofl, etc.) sparingly if at all.

9:33 PM

@zʏᴀʙiɴ101 You know, you don't have to keep mentioning the chatiquette every three minutes. We get it, you don't like it. Please just let it go.

Dr Green Eggs and Iron Man

@zʏᴀʙiɴ101 What conversation? :P

@DrGreenEggsandIronMan That's what the guidelines say.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Geobits That seems a little unfair. He talked only about an hour ago

I dunno. It just seems like every time I glance in on chat today, it's right there.

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ Slight hyperbole. Near every time that Chatiquette comes up, zyabin voices their disapproval.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

9:36 PM

@El'endiaStarman I see at as a person being mad at another person being mad. ¯\_(ツ)_/¯

Dr Green Eggs and Iron Man

@CᴏɴᴏʀO'Bʀɪᴇɴ I'm mad you said he's mad at another person being mad.

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ I'd say that Geobits is more likely to be tired of it than mad.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman Sorry, I can't resist a little bit of poetic charm.

El'endia Starman

Ha, I know the feel.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

For PE 25, I thought SED-style addition might be handy for arbitrary capacity numbers. However, after 10 minutes of calculating fib(501), I'm just about ready to throw in the sock.

9:39 PM

sock-lives-matter

El'endia Starman

SED-style addition?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

28

Q: Addition with 'sed'

I am trying to perform a mathematical operation with sed, but it continues to treat my variables as strings. The input is of this kind: $ echo 12 | sed 's/[0-9]*/&+3/' $ 12+3 I'd like to have 15 as output. I need to do the operation and replace its mathematical result in only one passage, beca...

Idk why I capitalized sed

SED-209

@CᴏɴᴏʀO'Bʀɪᴇɴ No need to calculate that much, I'm pretty sure you can write a mathematical expression that evaluates to that value.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Yeah, that's what I'm working on right now.

9:46 PM

Rough estimate puts the target somewhere just under fib(5000), right?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

SHHHHHHH

damnit

For the record, I haven't done the problem and I don't know the answer. I'm just looking at fibs, and they seem to go up a digit in length every just-under-fives.

El'endia Starman

Not like that's a big secret though. There's a closed-form solution and you can log10 it to get an estimate of the number of digits.

Unrelatedly, this is what I'm struggling with: how to parse -2**4 (-16) and 2**-4 (0.0625) correctly.

Part of the difficulty is that I'm not sure how much of the work my existing code does towards doing that correctly. :P

Cᴏɴᴏʀ O'Bʀɪᴇɴ

hacky way: give - a higher precedence than **, but make a **- operator :P

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ That'd fail as soon as I did 2** -4.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

9:52 PM

make one for each possible combination of whitespace

El'endia Starman

Impossible, since I'm allowing an arbitrary amount of whitespace. :P

Cᴏɴᴏʀ O'Bʀɪᴇɴ

nothing is impossible if you believe

What do they parse as right now?

El'endia Starman

Uh, it wouldn't work since I haven't fully implemented unary minus.

That's probably a good first step ;)

El'endia Starman

Well, the issue with 2**-4 basically is the step I'm on. :P

10:00 PM

So a minus after another operator parses as unary, right?

El'endia Starman

I have to tweak the shunting yard algorithm further, and exactly how is something I haven't yet figured out.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

-M f N <=> (- M) f (N)

El'endia Starman

You're not telling me the grammar rule for it, are you? If you are, shucks, but my parser isn't implemented with grammar rules... >_>

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I don't know any specific grammar.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

10:16 PM

Using a function that returns a function is a valid function answer, right?

More generally, an expression that evaluates to a function is a valid submission.

(If that resulting function solves the challenge...)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Ah, okay

Dr Green Eggs and Iron Man

@MartinEnder Today I realized where the name "Stack cats" came from. For a second, I felt really enlightened, and that I felt stupid for not realizing earlier. =D

Oct 15 '15 at 15:28, by Martin Büttner

o.O Stack Cats is a palindrome... how has @Calvin'sHobbies not yet made a challenge about that?

this was about a month before I had the idea for the language

so it was actually the name that inspired the language and its semantics

Dr Green Eggs and Iron Man

I've been working on a sort of similar language that was inspired by this challenge:

34

Q: Are the brackets fully matched?

You must write a program or function that takes a string of brackets and outputs whether or not that string is fully matched. Your program should print a truthy or falsy value, and IO can be in any reasonable format. Rules and definitions: For the purpose of this challenge, a "bracket" is any...

code-golf string balanced-string

Every valid program is entirely matched brackets.

10:36 PM

0

Q: Build a marginal tax calculator

There have been some tax rate calculator problems here that depend on defined rates (specifically US federal rates), but none that have done it for arbitrary lists. Your task is to build a program or function that will take an arbitrary list of marginal tax brackets and calculate the effective a...

user image

Dr Green Eggs and Iron Man

@flawr Why'd you change comics?

Cause I liked this one better=)

(Same artist tough)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

o_o

Dr Green Eggs and Iron Man

New favorite emoticon: ಥ_ಥ

For when ಠ_ಠ just isn't enough

Cᴏɴᴏʀ O'Bʀɪᴇɴ

10:51 PM

ಥ╭╮ಥ

@DrGreenEggsandIronMan ఆ What the hell

@DrGreenEggsandIronMan If you really disapprove of something: ಠ್ಗಠ (Copyright by @Bálint)

@DrGreenEggsandIronMan don't worry, I've already an idea for another 42 challenge ;)

@flawr That's my idea :)

ಠ್ಗಠ

ఠ_ఠ instead if O_O

ಠ್ಧಠ instead of Hey!

ಠ್ಕಠ instead of :P

Cᴏɴᴏʀ O'Bʀɪᴇɴ

chat mini challenge: given a number N, get all pairs of numbers A,B where N>=(A,B)>=0 and A+B=N

10:56 PM

And (ರ್‍ತರ್‍) is an alternative Lenny face

@CᴏɴᴏʀO'Bʀɪᴇɴ how do you compare a scalar to a pair?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@SEJPM it's shorthand notation for both of A,B satisfy the inequality

@CᴏɴᴏʀO'Bʀɪᴇɴ oh, ok :)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

^_^

    ______________
 ౯/    |___|   \__\____
 |_____________________|
   O               O

10:58 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ [(x,y)|x<-[0..N],y<-[0..N],x+y==N] <-- Haskell

Cᴏɴᴏʀ O'Bʀɪᴇɴ

haskell has set builder notation? cool!

^Winged car

@CᴏɴᴏʀO'Bʀɪᴇɴ that's everything in haskell

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Maltysen I don't know any haskell

@CᴏɴᴏʀO'Bʀɪᴇɴ You should definitly learn haskell. it is so, damn, cool

11:00 PM

^

^^

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I should, but I asked you what release I should get, and I guess we both forgot

(the haskell solution is 34 bytes apparently),

@CᴏɴᴏʀO'Bʀɪᴇɴ most recent GHC?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

no idea what that means but I'll look into it

haskell.org/platform

"Haskell Platform: Haskell with batteries included"

Cᴏɴᴏʀ O'Bʀɪᴇɴ

11:02 PM

well geez I was on the wrong site that's why

full or minimal?

Doesn't reall ymatter when starting out.

Why not full?

Cᴏɴᴏʀ O'Bʀɪᴇɴ

okay, cool

@CᴏɴᴏʀO'Bʀɪᴇɴ N=>Array(N).fill``.map((_,b)=>[b,N-b])

Cᴏɴᴏʀ O'Bʀɪᴇɴ

TIL you can ping inside monospace

38 bytes

11:05 PM

@Bálint is that Haskell?

@SEJPM JavaScript

Cᴏɴᴏʀ O'Bʀɪᴇɴ

^

D:

@SEJPM Do you have any problems with that? ಠ್ಗಠ

Cᴏɴᴏʀ O'Bʀɪᴇɴ

anybody know J in here well enough to help me for a sec?

11:06 PM

@Bálint JavaScript tends to have an awful lot of "strange" / "wanky" / "undefined" behavior and this is why I dislike it

(click on my profile to see my main sites to understand ;)

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ Pytek will also have set builder notation. :D

@SEJPM ಠ_ರ That hurts

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman :D that's one of the reasons I can't wait for it

(BTW, I have disagree smiley's for everything, so....don't get scared if I only communicate using smileys)

@El'endiaStarman Can we somewhere see what this Pytek is about?

El'endia Starman

11:10 PM

@flawr quartata linked you to the chat room earlier, but I guess you might want this (old-ish draft of syntax spec): pytek.starmaninnovations.com/docs/syntax

I have yet to make a GitHub, REPL, or online interface, though I eventually will.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@El'endiaStarman I don't mean to seem picky, and I think I asked you this before, but why use TNR when there are literally hundreds of better fonts freely available on the internet?

El'endia Starman

@CᴏɴᴏʀO'Bʀɪᴇɴ 'cause I'm lazy.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

;_;

@El'endiaStarman How much of that is already fixed / open for suggestions?

El'endia Starman

Much the same reason that I don't prettify basically anything at play.starmaninnovations.com.

Dr Green Eggs and Iron Man

11:14 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ IDK why this took me so long to figure out, but here you go. MATL, 7 bytes: :"G@-@h

@CᴏɴᴏʀO'Bʀɪᴇɴ I actually just used haskell right now, to solve a project euler problem

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@Maltysen which one?

(number)

projecteuler.net/problem=39

Cᴏɴᴏʀ O'Bʀɪᴇɴ

I see

the list comprehensions and lazy eval, make it sooooo easy

El'endia Starman

11:16 PM

@flawr Hard to say. Some of it is already out of date (for instance, I probably won't make literal tuples a thing, relegating that to immutable:[] or something like that instead). Addition and concatenation are going to be separate operators. Most of the stuff under functions has been implemented, bitwise operators will be words instead of symbols, etc.

I'm open to suggestions though, and I'll let you know if it conflicts. Probably better to take this to the Pytek room though. (chat.stackexchange.com/rooms/35416/pytek)

I seriously need to update it. Hmm.

@CᴏɴᴏʀO'Bʀɪᴇɴ Maybe.

Cᴏɴᴏʀ O'Bʀɪᴇɴ

pairsum =: 3 : 0
	c =. 0
	k =. i.y+1
	l =. a:
	for_e. k do.
		l =. l ;~ e , c { |. k
		c =. 1 + c
	end.
	}: l
)

@El'endiaStarman That'd be great=)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

This generates all pairs that sum to y. This is a gross way to do it, I feel. Is there a better approach I could follow?

I'd love to read some more on what you've already done

El'endia Starman

11:23 PM

@flawr I guess I shall, since I'm still stuck on the operators/precedence thing.

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