The Nineteenth Byte

Alex A.

3:05 AM

VoteToClose

phase

I don't even know what is going on anymore

5

Geobits

@AlexA. Well, you're being almost as coherent as usual...

Alex A.

VoteToClose

Well that's mildly terrifying.

Alex A.

3:09 AM

^ oh god

This is actually a picture of Geobits with his son.

VoteToClose

Alex A.

what

just

what

VoteToClose

Alex A.

...

SuperJedi224

@Geobits I am doing the entire solar system on approximately the same scale

1 block is about 1700 miles

phase

3:12 AM

@SuperJedi224 he means 1 block is 1 meter

Alex A.

SuperJedi224

@phase That would be impossible, without mods

phase

@SuperJedi224 that's the point ;-;

Geobits

@SuperJedi224 Hence really impressed ;)

Alex A.

Geobits

3:13 AM

The whole system to some scale is still cool, though.

VoteToClose

Memes. So happy.

Alex A.

We should stop before the Stack Exchange servers auto-ban us for overly dank memes.

VoteToClose

Ermehgersh, they make little plushes with ಠ_ಠ on them!

:3

Alex A.

I saw that.

VoteToClose

:D That makes me so happy for some reason. XD

Alex A.

3:16 AM

It makes me not surprised.

Dennis

I wonder if any language outside the APL family has built-in function inversion.

phase

@Dennis What is function inversion?

Dennis

@AlexA. Did you get the ping for the ngn bugfix?

Alex A.

YES! Awesome!

@phase The inverse of a function, like how square root is the opposite of squaring, etc.

SuperJedi224

The sun is going to be hollow, if I ever wind up finishing it

Doorknob

3:19 AM

@AlexA. 1/x is not the inverse of the identity function

y=x is its own inverse

phase

@AlexA. Ah, I thought it was like reversing the code within the function. That sounds like a good idea.....

SuperJedi224

So far it's just a square glowstone wall

501 blocks to a side

Alex A.

@Doorknob No one claimed that. <.< >.>

Dennis

@phase If you have a function/verb f, you can apply its inverse with f^:_1 in J. For example, since #: is convert from integer to base 2, #:^:_1 is convert from base 2 to integer.

Doorknob

@AlexA. heh (f(x)=1/x is its own inverse as well)

phase

3:21 AM

@Dennis Can you specify the inverse of functions you create?

Goodbye guys

bai

^

same

As long as they're bijective, it works for user-defined functions (specifically, tacit verbs) as well.

Bye!

Alex A.

3:22 AM

@Doorknob These are things I should remember...

phase

But how does the computer know how to inverse the function? Just go through all the operations in the wrong direction?

Dennis

No clue.

Alex A.

^

Doorknob

@AlexA. remember? it's just f(x)=1/x -> x=1/f^-1(x) -> f^-1(x)=1/x

Dennis

J has magic built in.

Alex A.

3:23 AM

As does Dyalog

Doorknob

or you can use the fact that the graph of y=1/x is symmetrical over y=x

phase

@Dennis seems legit

Dennis

This is my new favorite feature of J, since it allowed me to beat Pyth recently.

VoteToClose

> J is actually written in ~~Mathematica~~ Mathemagica as of now.

phase

@Dennis link to that black magic?

Dennis

3:24 AM

3

A: Biplex: an important useless operator

J, 31 30 24 23 bytes (e.>./,<./@#~)@(+/)&.#: This is a tacit, monadic verb that takes a list of decimal integers and returns their decimal biplex. Thanks to @Zgarb for his suggestions, which saved 4 bytes directly and paved the way for 2 more! Test cases biplex =: (e.>./,<./@#~)@(+/)&.#:...

I'm using dual (&.), which applies a function, then another function, then the inverse of the first. Perfect for convert to base 2, do stuff, convert back to base 10.

For a more impressive use of J's function inversion, see this:

2

A: Pack sequences of non-negative integers

J - 17 char g=:(f=:_ q:>:)inv We implement the prime exponent idea with this bijection—that's what the _ q: is doing, getting a list of the exponents of the primes of a number—except we also increment the input number by one before doing so, with >:, so that we don't forget 0, who doesn't have...

Alex A.

^ he probably doesn't need g=:, saving 3 bytes

phase

I need to get on board this APL train, cause it's awesome :O

Dennis

> Do this by defining two functions: f, going from N and c0 (N); and g, the inverse of f.

Alex A.

@phase APL != J

APL > J ;)

Dennis

(It's his own challenge. He should know.)

Alex A.

3:28 AM

o

i c

k

phase

@AlexA. Is there any major difference between APL & J?

Alex A.

Lots

Dennis

J wastes a lot of characters in two-char built-in names, but APL has way less magic.

Alex A.

J looks like someone barfed ASCII and is entirely unreadable

But when you explain the code it's super elegant

Dennis

@phase They're entirely different languages. It's like comparing Perl to Python.

@AlexA. At least J is typeable. :P

Alex A.

3:29 AM

<.< you have a point

phase

Just get a keyboard with all the unicodes

Alex A.

All of them? All the unicodes?

phase

every single unicode

Alex A.

o shit

that's a lot of unicodes

Dennis

Hm. There's only a million of them, and I have lots of free space on my desk.

brb Buying keyboard.

Alex A.

3:31 AM

:D

quartata

@phase github.com/quartata/rotor-lang

phase

@quartata yaaaaassss groooooovy

quartata

@phase :D

phase

Real Life Emoji Keyboard!

►

Alex A.

quartata

3:33 AM

@AlexA. I need this.

I think I would like APL way better if I had this.

Whoa top 0.99% this week

Alex A.

It's £100...

quartata

I feel so elite

@AlexA. Eep

Why?

Alex A.

$153.81 USD

Because they can

Dennis

@AlexA. Even that has a Windows symbol. >.<

quartata

I mean, for that price I could literally buy a bunch of pushbuttons and a Teensy for way less

Alex A.

3:35 AM

Teensy? Is that some kind of street name for drugs?

quartata

@AlexA. pjrc.com/teensy/index.html

pjrc.com/teensy/td_keyboard.html

Not to advertise or anything... but it would probably be a decent way of making an APL keyboard

feersum

Why would you need that?

Alex A.

^

quartata

Because.

feersum

Just paint your keycaps and install the layout.

quartata

3:37 AM

@feersum Painting keycaps is difficult

Switching layouts is difficult too

What if you want to type in the regular alphabet too?

Alex A.

@quartata It's Cmd+Space on a Mac.

feersum

Switching layouts is very easy in my experience.

quartata

You could just have this as a little keypad on the side

feersum

Ctrl+Shift on windows.

quartata

While having your regular keyboard.

feersum

3:38 AM

Those don't fit on a "little" keypad.

Alex A.

I didn't know what you meant

feersum

It probably doesn't require a layout switch anyway.

quartata

@feersum You could use another button to switch letters. Like on a calculator

Alex A.

@Dennis ಠ_ಠ

feersum

If it's like e.g. French keyboards, where there are 3 or 4 symbols on each button and you press another meta key to get them.

Alex A.

3:40 AM

The French AZERTY keyboard is hell to use.

Vɪʜᴀɴ

3:51 AM

TeaScript's interpreter takes 5 seconds to load. halp

Alex A.

Patience

feersum

What did you put in there?

Alex A.

Bugs lal

quartata

CJam does not have a builtin for removing the secondmost element in the stack right? You have to do \;

Dennis

Depends on what it yes. In general, yes.

quartata

4:03 AM

Alright.

Vɪʜᴀɴ

Well now I broke the interpreter ;-;

Doorknob

    You should have received a copy of the GNU General Public License
    along with this program. If not, write to

       The Free Software Foundation, Inc.
       51 Franklin Street, Fifth Floor
       Boston, MA 02110-1301  USA

do the people who wrote the GPU really expect people to do that?

mınxomaτ

I also love proprietary licenses that end with "write me at <somename>@geocities.com" ...

feersum

Communicating via Internet or telephone involves using closed-source software. True freedom lovers use the Postal Service.

Alex A.

True freedom lovers deliver mail themselves on horseback.

Geobits

4:18 AM

True freedom lovers don't trust the motives of horses.

Doorknob

True freedom lovers communicate via butterflies instead.

feersum

Horses bred with proprietary DNA.

mınxomaτ

I usually just shout really loud and hope the software author hears me.

Alex A.

True freedom lovers ignore the license entirely.

Geobits

I suppose the only way to do it properly is to walk naked to the recipient and speak directly to them.

Alex A.

4:21 AM

Unless they see you coming and lock up their house.

Geobits

Well, anyone can choose not to listen. That's freedom for ya.

mınxomaτ

@AlexA. Fork their house and remove the door in a patch :)

Alex A.

I don't know about you, but I don't git commit my living quarters.

feersum

Why bother. Just fork the recipient.

Geobits

@AlexA. You should. I had an apartment catch fire once. An offsite backup would've been nice.

Alex A.

4:22 AM

Oh god, were you and everyone else okay??

Doorknob

no he died

Geobits

Yea, this was years ago. Nobody hurt or anything, just ruined the building. It started in another apartment.

mınxomaτ

GPLv2 was kinda ok, GPLv3 is just plain stupid. I prefer the Artistic License. If you are going open-source, go all the way.

Alex A.

@Doorknob OH GOD NO NOT GEOBITS WHY

@Geobits I'm really glad no one was hurt. Still sucks that it happened though. :/

Neighbors are the worst. This is why everyone should live in the woods at least 100km from the nearest human.

Geobits

Oh it definitely sucked for a while. It was a good way to clear out my paperback collection, though.

Dennis

4:25 AM

@AlexA. I tried. Others did the same, not counting me.

Geobits

Great motivation to get a Kindle.

2

Alex A.

<_<

Isn't that just kindling?

Geobits

I made sure to capitalize the K just for you ;)

Alex A.

Aw!

You're so sweet.

<3 <3 <3

Geobits

Those could be hearts or chicken-head silhouettes. Coming from a bird, it's hard to tell.

Alex A.

4:28 AM

Obviously it's not chickens because chickens are crooked

See example above

Geobits

Oh god they have holes going straight through their heads, too.

Alex A.

Those are called balance slots. They make it so chickens can stay balanced when they stand all crooked like that.

Geobits

Poor chickens. And here I thought they were just tasty treats.

Like most other birds, I guess.

Alex A.

I should really be going... You know, somewhere you can't reach me with a fork.

Geobits

Cooked right I don't think I'd need a fork.

I mean, no rush... stay a while.

Alex A.

4:31 AM

O___o

Geobits

Oh you have balance slots, too? And one is bigger than the other. Does that mean you're normally lopsided?

mınxomaτ

qb64 is the first compiler I've used that fails to compile a source file if it contains any tabs. >:(

Alex A.

@Doorknob ^^^

We're winning

Geobits

I've had issues with qb64 before, so that's just another nail in the coffin really.

Alex A.

We've found our dream compiler

mınxomaτ

4:35 AM

@Geobits I've never had an issue with qb64. I just found one bug and it was fixed immediately.

Geobits

I had it fail to work in spectacular fashion. This was at least a year or so ago, so I don't know what it's like now if it's being updated regularly.

Which platform are you using it on?

mınxomaτ

Windows primarily, because I have to update tons of QB code from olds POS systems.

Thomas Kwa

@Dennis jaw drops

J is indeed magic

Dennis

No arguments there.

Geobits

Maybe that's it. I haven't tried the windows version.

Alex A.

4:40 AM

Incomprehensible magic, but magic nonetheless.

Dennis

Magic is by definition incomprehensible. Everything else is science.

Geobits

Unless you mean stage magic. Then it's, umm... "magic"?

Mainly I just hate the term illusionist. You're a damned magician, get over yourself :)

Dennis

I somehow read damned as damaged.

Optimizer

stage magic can be comprehended, you just need internet

Alex A.

What is ukda chawal?

Optimizer

4:44 AM

What am I? Your guide to Indian food?

:P

Alex A.

I'm asking anyone.

(But if you're offering... :P)

Optimizer

nice timing then :P

Geobits

An explanation here :P

Alex A.

:P

( ͡ಠ ͜ʖ ͡ಠ)

Optimizer

serves you right

Alex A.

4:47 AM

( ͠ಠ ͟ʖ ͠ಠ)

Geobits

Chicken-Google

Optimizer

AlexA. is the besto modo everu

Alex A.

@Geobits This physically pains me

@Optimizer HAI, SOO DESU

Optimizer

birds find it difficult to tilt their heads?

Alex A.

Not if Indian food is involved.

Geobits

4:49 AM

It's still better than barrel rolls.

Alex A.

I wish Google would make you food if you searched for food.

Geobits

Give it a few years.

You never noticed Picard saying "Okay Google" before talking to the replicator?

6

Alex A.

I always heard "Hey Siri." :P

Geobits

That's because tag reasons.

Alex A.

What?

Geobits

4:51 AM

Do I have to say it?

Alex A.

Oh.

That tag.

Geobits

:D

Alex A.

geobits-is-tag-reasons

Dennis

@AlexA. Google Now has make me a sandwich. You should really upgrade to Android.

Alex A.

D:

Dennis

4:54 AM

(I'm not kidding. It does.)

Geobits

Oh wow, it does. That's great.

Alex A.

What does it do?

Geobits

I should probably try sudo...

Dennis

Yes, you should.

Geobits

Oh wow. Not expected.

Alex A.

4:56 AM

;_;

Geobits

> make me a sandwich.
What? Make it yourself.
sudo make me a sandwich
Here are the listings for delis within seven miles.

Alex A.

Hahaha

mınxomaτ

Ha

Geobits

> who are you?
Searching for yourself can take a lifetime, but a good place to start is classic rock (along with link to https://www.youtube.com/watch?v=PdLIerfXuZ4)

On that note, I'm off. Don't do anything I wouldn't do (this includes ASCII art).

Alex A.

I'll try.

Dennis

5:14 AM

Heck, private repos require a paid GitHub account.

Alex A.

Yes

Heck they do

Optimizer

@Dennis open source is free!

you can use bit bucket

Dennis

Interesting.

This would kill in a golfier language:

1

A: Who's that probability distribution?

Julia, 57 bytes + 25 errors = 82 k->(V=var(k))>1/6?"E":V>0.1?"B":V<.05?"T":any(k.>1)?"G":"U" k->(V=var(k))>0.14?"E":V>0.1?"B":V<.05?"T":any(k.>1)?"G":"U" This is fairly simple. The variance for the distributions are mostly different - it's 1/4 for exponential, 1/8 for beta, 1/12 for gamma and ...

Sp3000

5:31 AM

Variance is a nice way to go :)

I wonder what happens if you do, say, average of cubes or average of fourth powers

Dennis

I tried variance (stdev, but whatever), but I got awful results. It could be related to the revised test cases, but my biggest mistake was to not combine it with the has-elements-greater-than-1 test.

phase

@Dennis Student Pack gives you 5 free ones, plus OSS FTW

Dennis

I can't find that anywhere.

Nevermind.

phase

They recently added AWS to it too

Thomas Kwa

5:49 AM

@Dennis I had that idea too. You can see from my deleted Pyth answer.

I was going to use either TI-BASIC or Stuck, because Pyth doesn't have variance.

My other idea was to use the first quartile of the data, but that ended up being worse than variance.

Dennis

Variance is around 10 bytes in Pyth IIRC.

Good night, y'all.

Thomas Kwa

Yeah, I had to use -.OQRQ or whatever it is to subtract from mean, then .a for vector length

Goodnight!

El'endia Starman

G'night!

DLosc

6:05 AM

@mınxomaτ Wait--you actually use QB64 for work? (O . O)

mınxomaτ

So what?

DLosc

I just didn't think QBasic would have any real-world relevance anymore. I use it for fun & nostalgia.

feersum

What would be really shocking is if someone used Haskell at work.

mınxomaτ

@DLosc You know that qb64 is based on QB4.5 but has a lot more features?

And it generates crossplatform C++ code.

DLosc

Yes. But you're working with POS systems that were running QB originally, right?

(Hm, I guess that'd put them at only 20 years old or so... how time flies.)

mınxomaτ

6:09 AM

Most POS or cash registers use freedos or DOS. I needed to upgrade one to complete inventory (not related to my job :) ).

I then sold the new interface to owners of compatible POS. ^^

DLosc

Again: wow/fascinating.

El'endia Starman

I keep reading "POS" as an obscene acronym and I can't figure out what it actually means. Such confusion. Wow.

himu

If `**(sqrt(2))^2=2**`

Then **2^

(Sqrt 2) ** is what???

DLosc

@El'endiaStarman Point Of Sale [system].

mınxomaτ

But with the new money laundering laws passed recently here in Germany most retailers have to switch to a standardized (expensive) new type of register. It is supposed to be "hacking" proof (insert evil laughter here)

El'endia Starman

6:13 AM

@DLosc Ahh, thanks.

himu

Is anybody knows anything for this question i posed.

DLosc

@mınxomaτ Yeah, my employer has had to make some upgrades in the past few years to comply with US credit card laws... not my area, though, so I don't know much more than that.

phase

@himu I'm not quite sure what you were asking

mınxomaτ

@DLosc Basically there can be surprise visits from the tax authorities and they have an ID card with a private key on it so only they can access the cash log files.

The system is already hacked and it's not even out yet.

Κριτικσι Λίθος

@himu Use a calculator :)

Calvin's Hobbies

6:16 AM

@himu Are you asking what 2^sqrt(2) is?

Something looks terribly wrong with our starboard @AlexA.

Alex A.

@Calvin'sHobbies Oh yeah? What's that?

Is it that? ^

feersum

The problem is the newlines are missing.

Calvin's Hobbies

It's giving me the textual creepy crawlies

Alex A.

Oh no!

Calvin's Hobbies

6:33 AM

All that mod power going to your keyboard..

Alex A.

You want me to kill the Lennipede, don't you?

First Reggie, now the Lennipede...

Why must everything I love die?

El'endia Starman

6:49 AM

Booted up an old computer after taking out an unnecessary video card. Windows XP. Wow, reminds me of the days when Windows 95/98 was the common old Windows OS. :P

Optimizer

El'endia Starman

8:40 AM

Random walk. :P

(Pinging @CᴏɴᴏʀO'Bʀɪᴇɴ and @VoteToClose.)

Optimizer

localhost?

not sure why you post that link

@El'endiaStarman ^

El'endia Starman

DANGIT.

I KEEP DOING THAT!

Also, random numbers!

@Optimizer: Fixed.

Optimizer

dangit, you can edit infinitely ?

Martin Büttner

Mods can.

El'endia Starman

^_^

Optimizer

9:00 AM

damn

imma be a mod now

El'endia Starman

Pick a new beta, make yourself indispensable. :P

Optimizer

too much ~~work~~ trouble

flawr

@dennis not all, also tried to optimize the distance function which also improved somewhat

VoteToClose

9:17 AM

@El'endiaStarman \o/

Mitch Schwartz

@Lembik i thought for strange coins that your description is clear and unambiguous, but then i read the comments with mbomb007 and then it needs clarification

because of your reply to him

you wrote x_0 in your comment, which is confusing -- makes it sound like you can choose an arbitrary new coin to start weighing, and not just coin 0

since from problem description it seems clear that {x_i} is just arbitrary collection of indices, and the i doesn't give the coin's label, as mbomb007 seemed to interpret it

QPaysTaxes was maybe confused about this too, since he mentioned about "a through b", although your description doesn't imply that the chosen coins have to have consecutive labels, as far as i can see

maybe best way to avoid confusion is to give short example, e.g. first weighing is (x_1, x_2, x_3) = (3, 2, 7), then second weighing can be either (4, 3, 8) or (0, 4, 3, 8)

Lembik

9:47 AM

@MitchSchwartz hi

Mitch Schwartz

hey

Lembik

that's an error!

let me fix it

sorry for the error

the comment should be fixed now

Mitch Schwartz

thanks, i see it

feersum

Whoa

gcc lets me put a goto statement inside a ternary conditional

x > 4 ? ({goto abc;}) : 0;

This is going to be my backup if it won't do TCO.

Lembik

@MitchSchwartz thanks for spotting it and welcome back :) If you have been away

feersum

9:52 AM

gcc extensions are a lot of fun for code golf

I can also initialize structs like a python dict.

Lembik

@MitchSchwartz thank you for your very helpful comment!!

Mitch Schwartz

@Lembik thanks. i added a comment about notation

Lembik

yes.. that's what I meant

very helpful indeed

Mitch Schwartz

i guess it could be clarified: if we choose second weighing (0, 4, 3, 8), then third weighing can be either (1, 5, 4, 9) or (0, 1, 5, 4, 9) ?

the other option is (5, 4, 9) vs (0, 5, 4, 9)

@Lembik ^

it seems the chat message time stamps are at a resolution of 1 minute only?

i guess a finer resolution isn't useful for most things and just uses server space, but there is a little odd interaction above, where my message and Lembik's were within a second of each other, and "crossed in the mail"

Optimizer

10:25 AM

someone is simulating the universe right now!

well, apart from the one who was already doing it from ages

New Main Posts

10:50 AM

0

Q: "Hello world" that creates a different "Hello world" program

Create a program, that outputs a hello world string ("Hello world", "Hello, World" etc.), and source code. Output is written to stdout or equivalent. Hello world string is embedded in the source code. For example, the output for might be (some source code here)hello world(some source code here)...

New Sandboxed Posts

11:32 AM

0

A: Sandbox for Proposed Challenges

Literally Mirror Your Sourcecode! Task Your program should take input. If the input is falsy, print the source code. If the input is truthy, print the mirrored source code. What is mirrored in my opinion (That is used in this challenge)? Each line is padded with space so each line have sa...

Lembik

11:43 AM

@MitchSchwartz (1, 5, 4, 9) or (0, 1, 5, 4, 9) is correct

Doorknob

12:13 PM

@AlexA. >:D

Lembik

@MitchSchwartz are you still about?

Optimizer

about to come?

himu

12:30 PM

@Calvin'sHobbies yeah!sir actually my problem is to fing the nature of that no.
Rational, irrational or even a complex one.

feersum

1:16 PM

Anyone used cygwin?

I can't find the proper way to invoke cygwin's gcc.

mınxomaτ

I see your error: You're using cygwin.

feersum

I wouldn't normally use it, but I'm doing it for a code golf.

I'm hoping it supports the dynamic allocation option for scanf.

New Main Posts

2

Q: Make a 3var interpreter!

3var is a variant of deadfish which uses three variables called A, B and R. A and B are accumulators, while R is used as a result variable. In this code-golf challenge, you need to make an interpreter for a stripped-down version of this language. Required Commands: i Increments A d Decre...

code-golf interpreter

New Sandboxed Posts

1:58 PM

0

A: Sandbox for Proposed Challenges

Print a sourcecode Task: code-golfquine Given 2 inputs(First input is truthy/falsy, second input is program in same language as submission): If the first input is truthy then transform the second input into same program but printing the source code(After modification) first. If the first inp...

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