The Nineteenth Byte

Destructible Lemon

00:00

you have done a bad job of explaining

>:|

explain better please

maybe with a diagram

trichoplax

Both steps start with "push child list", which I assume means a new empty list

ASCII-only

@trichoplax Yes

trichoplax

So each digit, a new empty list is added. The value of the digit just affects whether it's added at the current level or the next one in

ASCII-only

 f=(n,l=[],m=[])=>n&&l.push(m)&&f((n/2)|0,n%2?l:m)&&0||l
g=l=>l[0]?l[1]?g(l.shift())+2*g(l)+1:g(l[0])*2:1
h=l=>(g(l)/2)|0

Yeah

Destructible Lemon

how do you go one level out then?

ASCII-only

00:02

@DestructibleLemon You don't, it's recursive

Destructible Lemon

???

‽

ASCII-only

@DestructibleLemon Why do you need to go one level out

trichoplax

Recursion cannot be explained. You have to see it for yourself

Destructible Lemon

@ASCII-only [[][[][[][]]]] is not the same as [[[][[][]]][]]

@trichoplax I know what recursion is. its just that you have two way progression in this task; down and to the right. you have to do one first, then the other. how is to the right done?

totallyhuman

;-; google i thought you were smarter than that

too much snek

ASCII-only

00:04

@DestructibleLemon it's done when n%2==0 (push new child to parent)

trichoplax

@DestructibleLemon I know you know what recursion is :) I just meant that working through an example is usually easier than the abstract explanation

Destructible Lemon

please give an example then ascii only

@ASCII-only what is n...

ATaco

function doTheThing(x){
	if(x==""){
		return [];
	}
	if(x[0]=="1")
		return [doTheThing(x.substr(1))]
	return [[],doTheThing(x.substr(1))]
}

takes a binary string as input.

And I think it works..?

ASCII-only

@DestructibleLemon number input to f

ATaco

I haven't got the inverse function created yet.

Destructible Lemon

00:09

@ATaco how would you do [[[[]]][]]?

ATaco

lmao I haven no idea.

Destructible Lemon

back to the drawing board?

ATaco

Probably.

It's also impossible to get [[][][]]

Downgoat

00:21

Question: if I have the following struct:

struct ST {
  int X;
  double Y;
  struct RT Z;
};

and struct ST *s;

what does s[1] return?

ATaco

00:34

function doTheThing(x){
	var ups = [];
	var main = [];
	var ths = main;
	for(var i=0; i < x.length; i++){
		if(x[i] == "1"){
			var last = ths;
			ths = ups.pop();
			if(typeof ths == 'undefined'){
				ths = [last];
				main = ths;
			}
		}else{
			ups.push(ths);
			ths = ths.push([]);
		}
	}
	return main
}

Second solution.

ASCII-only

ugh this is harder than i thought

ATaco

Yes! The solution works!

Riker

@ComradeSparklePony does my edit to your challenge work?

Dennis

→ 3 messages moved to talk.tryitonline.net

Comrade SparklePony

01:11

@Riker Yes. Thank you very much.

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

PPCG's Unanswered Questions code-golf stack-exchange-api This dear StackExchange site has so many challenges, and so many good answers. But what about the challenges that were never answered? Task Write a program or a function that will print a random unanswered challenge from PPCG. Output ...

Destructible Lemon

01:30

hmmm, I had an idea for my 2d lang. commands look in the surrounding spaces for scalar characters, which are placed when writing the program and maybe reflectively

and a scalar might be modified by just moving over it a bunch of times

hmmm, nah there will probably be a command to alter them. but I don't know how this should work...

Christopher

@Dennis Sheesh and I thought you were a smart person XD

I mean who can't read compressed streams

Dennis

At the very least, I'd have to know which kind of stream. Since Bubblegum can't read it eithwr, I only know that it's the wrong kind.

Christopher

@Dennis It was a deflate stream

I was trying to compress the bear challenge text but it was dupe closed ;(

I mean really. Please let me post answers that crush everyone then close it! So I will have the most golf answer

Dennis

01:46

There's a 395-byte SOGL answer. Bubblegum won't get anywhere near that.

Christopher

@Dennis ARE YOU KIDDING ME. People reopen the challenge just in time for someone to outgolf me in an answer that I was planning on posting and you close it.

I feel like this whole site is just an conspiracy to make me feel sad :(

Destructible Lemon

that is rather egotistical

Christopher

@DestructibleLemon Just because the world revolves around me does not mean I am egotistical.

Destructible Lemon

actually the world revolves around an imaginary axis

christopher is imaginary axis?

Christopher

@DestructibleLemon Yes. Also the universe does also

Destructible Lemon

01:55

no there is no reason to believe the universe revolves

Christopher

@DestructibleLemon Sorry the center of the universe is me

According to science I am right :P

Destructible Lemon

doubtful

the earth moves around the sun. unless the universe pulses back and forth, the centre of the universe is moving in a constant direction

Christopher

The universe is supposed to be of an infinite size. Therefore everywhere is the center. And if it just loops around like a torus then again. Everywhere is the center

Destructible Lemon

if you assume centre of universe is centre of mass

Christopher

@DestructibleLemon Remember in the land of ego. I am always right. And as my ego has expanded to include TNB I am right.

Destructible Lemon

01:58

it is doubtful the centre of the universe moves around the sun

Christopher

@DestructibleLemon I did not say it moved around. I corrected to I am the center of the universe. Get my egotistical facts right!

Thanks for amusing me @DestructibleLemon. I should get back to working

Nick Clifford

02:11

Ugh, it's hard to be active on PPCG when it's finals season

So much work

Christopher

Hah Finals. I have no finals :P The closest thing I have is an AP Calc test for next year :P

Conor O'Brien

@quartata does it make sense if I have C code in an if(false) statement that is syntactically valid, it makes the difference between the code running and crashing?

ATaco

Instead of finals I just have more work...

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Friendly Reputation Competition Challenge Given a list of user IDs, output the IDs of the two applicable people whenever someone's reputation surpasses the others. Specifics Let's take me (id 46249) and programmer5000 (id 58826) as examples. At the time of posting, our reputations are quite c...

Christopher

codegolf.stackexchange.com/a/120002/63187 someone post an answer please. I want to finish it

Post in a unary version

Destructible Lemon

02:34

unary was made after that challenge I think

wait I can't recall

@Christopher lenguage was made after the challenge yeah. delete it. there are multiple attempts at using lenguage on this challenge but they were deleted

Riker

03:28

just hit 250 LQPs reviewed :D

silver badge for me

DJMcMayhem

Welcome to the mile high club!

That badge is quickly becoming less and less prestigious

I remember being the 5th user to get it.

Now there's 9

Riker

9 is still somewhat small

@DJMcMayhem not gold yet :p

I do'nt think anybody has gold there

huh, nobody has any gold review badges

DJMcMayhem

I'm working on it

Riker

martin is close with 900ish for FPs

@DJMcMayhem :p

everybody else is under 500 I think

DJMcMayhem

I have 600+ in VLQ

Riker

03:35

ah nice

DJMcMayhem

Martin is 142 away, I'm 368 away.

Riker

yea

you'll get there soon enough :p

6-8 weeks I'd reckon

DJMcMayhem

My plan is if I can keep the first posts queue empty for long enough, I'll be able to slow him down and catch up to him. :P

Nick Clifford

CMC: Given a set of polar coordinates (r, θ) where θ is in radians, generate the corresponding rectangular coordinates (x, y).

ATaco

$\theta$ in Radians?

Nick Clifford

03:39

yep

Jan Dvorak

->x{Complex.polar(*x).rect}

ATaco

RProgN, 15 Bytes. ~x=y=(xGy*xDy*)

Downgoat

@TuxCopter question: is c'est l'audio de lui raconte la chose make sense?

Leaky Nun

39 bytes:

import math
lambda r,u:r*math.e**(1j*u)

Try it online!

@Downgoat raconter

Downgoat

>_< oops thanks

Leaky Nun

03:45

and it looks like a very mechanical translation of "it is the audio of him recounting the thing"

@Downgoat you're missing the r

@Downgoat I would say c'est l'audio de lui où il raconte la chose

Jan Dvorak

->r,a{r*Math::E**1i*a}

quartata

04:07

@ConorO'Brien Not entirely sure what you mean. That will be optimized out via constant folding + dead code elimination though

Should use an #if if that's your intent

Destructible Lemon

04:23

@Downgoat (the question you're asking doesn't seem to make sense even :P)

> is [quote] make sense

Adám

@NickClifford APL, 7 bytes: ⊣×¯12○⊢

Adám

04:40

@NickClifford J and NARS APL, 0 bytes: just enter the numbers separated by "ar": rarθ, e.g. 10ar1.5.

Try it online!

New Main Posts

05:00

2

Q: Is the checkbox checked?

Doing code review, I stumbled upon the following code, that tests the status of a checkbox: if (!isNotUnchecked()) { ... } I had to brainstorm for 30 minutes to find out what actual checkbox status the code was expecting. Please write me a program that can simplify these silly expressions! ...

code-golf

Arjun

08:31

console.log("Test for XSS (Cross Site Scripting)")

Adám

@Arjun Test for XSS (Cross Site Scripting)

Wheat Wizard

Is there any way to get a list of languages that use echo to print?

Adám

@WheatWizard Yeah, I've had that question too.

Wheat Wizard

Currently my best solution is to go to rosetta codes page on hello world and search echo

Arjun

@WheatWizard Hey, I dropped a comment on your post "Anaglot Polygram" and also two on my own answer on that question. Have a look, in case you haven't!

Wheat Wizard

08:37

Yeah I saw them

Arjun

Oh okay.

I saw your reply too, just now.

Wheat Wizard

I would like to help you get up to score 1 sometime, don't have the time rn but I think it can be done

I know the pain of updating the TIO links though

Adám

@WheatWizard Is my Decode the Void solution ok now?

Wheat Wizard

I think so. I'm not totally clear on how its works and I don't know enough APL to test it thuroughly

Arjun

@WheatWizard And I have done that once! (Have a look at the revisions of the post!) My solution was invalid at first (printed 1 in every language).

Adám

08:42

@WheatWizard I've updated the TIO link with a few test cases, and it should be obvious how to test with any JSON.

Wheat Wizard

The length of the submission makes me suspicious however

Adám

@WheatWizard APL eats arrays for breakfast.

Wheat Wizard

Wait why do all them return 0?

I don't think that is right. It should be a bijection

Adám

@WheatWizard Any void list that is not in the correct encoded format should return 0. (0 is not in the acceptable domain of f)

Wheat Wizard

Er, no thats not really the goal

Adám

08:44

@WheatWizard Then I still don't understand. What is g supposed to do with invalid input?

Wheat Wizard

every void list should map to a unique integer

Adám

@WheatWizard Oh. You didn't specify that either. Add that exact phrase.

Wheat Wizard

The only invalid input for g should be a non-void list

Ok will add

Sorry about that

Adám

@WheatWizard Did you use the sandbox?

Wheat Wizard

Nope. I actually have not used the sandbox in a while I should get back in the habbit of doing that

I just tend to forget stuff in the sandbox

Arjun

08:50

@Adám Can APL be used for making Windows Applications?

Adám

@Arjun Yes, absolutely.

To quote from our documentation:
GUI objects are represented by .NET classes in the .NET Namespace System.Windows.Forms. In general, these classes correspond closely to the GUI objects provided by Dyalog APL, which are themselves based upon the Windows API.

For example, to create a form containing a button and an edit field, you would create instances of the Form, Button and TextBox classes.

Mayube

oh APL can use .NET winforms?

Adám

@Mayube Yep.

Mayube

neato

Kritixi Lithos

@Adám So making forms using ⎕WC is limited to computers running Windows?

Adám

08:57

@Arjun In fact, the default Windows interface for Dyalog APL is partially written in APL.

@KritixiLithos No, making .NET forms using ⎕WC is limited to Windows. ⎕WC can do more than .NET.

Kritixi Lithos

The reason I'm asking is that running something like 'F1'⎕WC'Form' gives an error

Anonymous

@Adám So APL doesn't play nice with Mono?

Adám

@Mego I don't know. I'd need to ask our Windows/.NET/platforms/porting guy, but he's at BUILD.

@KritixiLithos Right, that would attempt to create a .NET form, which obviously doesn't work on macOS.

From version 16.0, 'wb'⎕WC'HTMLRenderer' opens a CEF window.

Mayube

Mono doesn't fully support WinForms, but does to an extent, and converts it to gtk

Adám

I've seen an Andoid app running on Dyalog APL too. Ran on a watch, a phone, and a TV.

Kritixi Lithos

09:08

Ooh, that's neat

how does it work? Is there a GH repo or something for Dyalog on Android?

Adám

@Mayube I guess Braingolf can't do that.

Mayube

pff braingolf can't do anything

you can't even feasibly say "is the input string equal to this string" in braingolf

Adám

@KritixiLithos No, it isn't official yet, but see it in action here.

Stewie Griffin

Is anoyone ready to test some submissions? Dennis needs Exactly 15 points to be tied with Martin. That's very easy to achieve.

betseg

@Riker that video is now all time top post in /r/videos with 140k upvotes and 7 golds

Adám

09:16

@StewieGriffin I don't think we are allowed to vote for such a reason.

Stewie Griffin

No, but I can guarantee you that Dennis has a post you haven't voted on that deserves an upvote!

Adám

@StewieGriffin Challenge idea: given a user number, find all Dennis's posts that that user has not upvoted.

Stewie Griffin

Well, I don't know how much you vote, so I'll rephrase: I can guarantee you that Dennis has a post I haven't voted on that deserves an upvote!

Impossible. You can't see other peoples votes...

Adám

@StewieGriffin Yeah, well, I tend to exhaust my vote cap lately.

@StewieGriffin Given a logged in user, etc.

0

Q: Is it permitted to upvote only to test submissions?

In order to properly test the submissions to Martin vs Dennis - Round 1, one would need to upvote the current lesserso their reps become equal, and then continue upvoting so the former lesser becomes the higher. Is it permitted to vote for this reason?

discussion policy reputation votes testing

@StewieGriffin Why is your avatar here prohibited, while it is permitted on the site and on meta?

Stewie Griffin

stackoverflow.com/users/2338750/stewie-griffin?tab=profile

I haven't bothered changing it on chat.

I failed though, since I just ended up becoming addicted to PPCG instead.

Shaggy

09:33

@StewieGriffin Would it not be better to test by using different users who we know to be (currently) tied?

Adám

@StewieGriffin Yeah, their reps are likely to fluctuate by the second (especially with your request to vote for them), making testing even harder.

Shaggy

For example, here's my code modified to test 2 (seemingly) inactive users who are currently tied on 200 rep: jsbin.com/juqupifuyi/edit?js,console

Dennis & Martin tied right now! Quick, run your tests!

Kritixi Lithos

The winning 05AB1E submission works

Adám

I've found something from Dennis I'd like to upvote, but now I feel bad about voting.

Stewie Griffin

@Shaggy Good point...

@Adám New meta post: "Is it OK to not vote on a post that I'd normally vote on, just because someone asked me to vote on a post?"

Adám

09:52

@StewieGriffin Meta: Is it ok to encourage other users to vote or abstain from voting?

Shaggy

@Adám You shouldn't; if it's worthy of your upvote then upvote it.

Stewie Griffin

By the way, I could easily accept one of Dennis' answers to one of my challenges, as I'm sure he has the shortest submission in quite a few of them! Just too bad I've stopped accepting answers on code-golf challenges.

Shaggy

How many votes do proposals on Meta usually require before we can consider them consensuses?

Adám

@StewieGriffin Do we have a meta post on whether to accept code-golfs or not?

Stewie Griffin

24

A: We're not a Q&A site. But what should be done about it?

Remove the Accept feature This feature is likely way too integral to how SE instances work for this to be possible without forking the software, but I don't think the concept of accepted answers is useful on PPCG. The most fundamental pillar of this community is that every single question needs...

New Meta Posts

10:01

0

Q: Is it permitted to upvote only to test submissions?

In order to properly test the submissions to Martin vs Dennis - Round 1, one would need to upvote the current lesserso their reps become equal, and then continue upvoting so the former lesser becomes the higher. Is it permitted to vote for this reason?

discussion policy reputation votes testing

Adám

@Shaggy Post that on meta. The lowest number which is proposed by an answer which has enough votes to be considered consensus is your answer.

Stewie Griffin

+38/-14 is not necessarily enough to be called a consensus, but I strongly agree, so I follow it.

Shaggy

@Adám That's made my brain itchy!

Stewie Griffin

I usually write: "The winners will be the shortest solutions in each language." in my challenges, although I forget it sometimes.

Shaggy

@StewieGriffin +8/-1 is definitely not a consensus then!

Adám

10:04

@Shaggy Maybe better: The lowest number which is proposed by an answer which has that many votes as it proposes is your answer.

Shaggy

@Adám Much better! :D

Stewie Griffin

+8/-1 means 8 times as many people favor that opinion, quite a clear consensus the way I see it. 38/14 means e times as many people favor that opinion. Not as clear.

Adám

@Shaggy So if I propose 0, that instantly becomes consensus (until someone downvotes it, of course).

Jan Dvorak

I propose that zero votes is enough for a consensus

Adám

@JanDvorak You have my downvote.

Jan Dvorak

10:06

... revenged

Stewie Griffin

And you have my sword!

Mayube

@JanDvorak You have my upvote though

Adám

I propose -∞.

Mayube

Infinity is a constraint or limit, not a number

you could propose -1000 though, doubt 1000 people will take time to downvote

Jan Dvorak

then Int::MIN_INTEGER

Adám

10:08

@Mayube Whatever. But that would then become the consensus, together with all other proposals on meta.

Mayube

but if there are multiple conflicting proposals, the highest upvoted becomes consensus

Jan Dvorak

it would make more sense to pick the highest proposal that hits its required score

Adám

@JanDvorak That's neat too, but much more conservative.

Mayube

@JanDvorak right but then -1000 would still win until somebody else posted a higher number and reached at least that many votes

Adám

@Mayube As soon as they post, they've reached it, if their number is also negative.

Mayube

10:11

right

Jan Dvorak

@Mayube that's the point. How can we agree on anything if we can't even agree on whether we agree on something...

5

Mayube

so you could overrule a post of -1000 with -1, unless 2 people downvote the -1 post

Adám

@JanDvorak I disagree.

Mayube

@JanDvorak I disagree, I don't think that's the point at all

Jan Dvorak

see?

Adám

10:11

@JanDvorak No.

Mayube

I disagree, that doesn't prove your point

Shaggy

My brain is getting itchy again!

Mayube

maybe we should just leave SE altogether and make our own site, with blackjack & hookers

Adám

There is another aspect. While a proposal may have an apparently relatively high score, it may mot indicate any consensus at all, consider e.g. a proposal with +45, but it's real score is +1045/-1000. Is that consensus?

Shaggy

@Mayube Your ideas are intriguing to me and i wish to subscribe to your newsletter.

Mayube

10:14

@Shaggy Send $25 in mesopatamian copper coins to the following address via Post

123 Real Street, Real City, Real Country

Jan Dvorak

If we want to be rigorous, we should require that at least a% people agree, with at least c% confidence as measured by the votes given

Stewie Griffin

It's impossible to determine a hard number that guarantees that we're doing the right thing. Sometimes you'd end up leaving the faith of the site in the hands of sadists craving ice cream.

Jan Dvorak

have fun computing cumulative binomial distributions every time you want to know if a rule applies

@StewieGriffin hey, where did you learn I like ice cream?

Adám

@JanDvorak Nice meta challenge.

Mayube

I mean surely it can be quite easily calculated as a ratio of upvotes to downvotes

Leaky Nun

10:17

@JanDvorak fortunately, we have short codes to calculate cumulative binomial distributions

Mayube

we just need to err.. come to a consensus on a minimum ratio for an accepted consensus

3

Jan Dvorak

I propose 95% confidence that at least 50% agree

which would imply five upvotes minimum with no dissent

Shaggy

@StewieGriffin And there I thought there would be hard & fast rules on what was considered a consensus.

Leaky Nun

@JanDvorak and how can we verify if the consensus is "95% confidence that at least 50% agree"?

we need to come to a consensus on a consensus on a minimum ratio for an accepted concensus

Jan Dvorak

@LeakyNun conservative self-validation voting on the requirement parameters :-)

Leaky Nun

10:19

@JanDvorak I propose that 0% agree with 0% confidence. I win.

Mayube

@LeakyNun We'll make a meta post about it, and use the winning ratio to find out if the winning ratio won

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Wave a flag This one is pretty simple. Take a flag, like this one: ----------------------------- | | | | | | |=============+=============| | | | | | | ----------------------------- And a number inp...

Jan Dvorak

@LeakyNun conservative = highest value that reaches its threshold wins

Adám

@Mayube So the requirements change every time someone votes on that meta-meta proposal?

Mayube

@Adám good point, let's come to a consensus on an accepted divergence in votes after a consensus has been agreed upon

Shaggy

10:21

I seem to have inadvertently opened a can of worms!

Jan Dvorak

Let's go fishing

Kritixi Lithos

"Let's go fishing"r>o<

Mayube

@KritixiLithos but that's in ><>, right? not in fishing

Leaky Nun

CMC: if we have 15 balls, we can make some balls into bars such that the contiguous balls have length 3: ooo|ooo|ooo|ooo. Given n and r, determine if it is possible to make some balls into bars such that the contiguous balls have length r.

Adám

@Mayube It will be really hard to keep up with the fluctuating consensuses. I'd need at least 8 hours every morning to reconsider all my acceptances, votes, and submissions.

Leaky Nun

10:28

And kudos to the one who discovers the formula (it is quite simple)

Christopher

@LeakyNun The answer is 42

Mayube

@Adám 8 hours seems like a rough guess, maybe we should prioritize coming to a consensus on how long you'll need every morning

Kritixi Lithos

@LeakyNun there are 12 balls in ooo|ooo|ooo|ooo

Destructible Lemon

@KritixiLithos plus the three made into bars

Christopher

Well it would be n/r = an int

Leaky Nun

10:29

@KritixiLithos read the question again

@Christopher no it wouldn't.

Christopher

Wait what

I read it wrong

Adám

@Mayube Meta: What percentage of my time spend on PPCG should I spend reconsidering my acceptances, votes, and submissions due to fluctuating consensuses?

Kritixi Lithos

I still don't get the CMC

Christopher

I think it is in latin

Leaky Nun

@KritixiLithos "make some balls into bars"

alternatively, "replace some balls with bars"

@Christopher not funny.

Adám

10:31

@LeakyNun Choose some other character than bar, as I too read "bar" as a ball-sequence (e.g. a 3-bar: ooo)

Shaggy

@KritixiLithos You start with ooooooooooooooo.

Leaky Nun

@Adám how is a "bar" a ball-sequence?

And what should I choose?

ASCII-only

@LeakyNun oh, so !((n+1)%(r+1))

Leaky Nun

@ASCII-only bingo

now golf that expression

Adám

@LeakyNun CMC: if we have 15 ones, we can make some ones into twos such that the contiguous ones have length 3: 111211121112111. Given n and r, determine if it is possible to make some ones into twos such that the contiguous ones have length r.

Leaky Nun

10:33

Everybody read ^ instead.

Shaggy

@LeakyNun n being the number of balls we start with?

Leaky Nun

@Shaggy yes

ASCII-only

@LeakyNun Javascript (ES6), 11 bytes: n=>r=>!(~n%~r)

Assuming -0 is a valid falsy value

Leaky Nun

@ASCII-only wait what?

>> -0?1:2
<< 2

ASCII-only

@LeakyNun oh wait nvm

Adám

10:35

@LeakyNun So whether r=(n-x)/(x+1) for any x?

Leaky Nun

@Adám Yes, you are right.

Adám

@LeakyNun e.g. n=15, r=3, 3=(15-x)/(x+1) → x=3

Anonymous

Math challenge/question: You're given a goal positive integer N, a starting positive integer X, and a real number in (0, 1) P. Is it possible to reach N if the only operations you can perform are X = X*(1+P) and X = X*(1-P)?

Leaky Nun

@Adám I said yes

@Mego good luck reaching N if P is irrational.

Anonymous

Concrete example: X = 50, N = 100, P = .1 (you need to get from 50 to 100 only by adding or subtracting 10% of the current value).

Anonymous

10:38

@LeakyNun Ok, restrict P to rational values

Destructible Lemon

isn't this is (x+1) divisible by (r+1)?

Leaky Nun

@DestructibleLemon yes it is

@Mego so you are asking whether 100 = 50 * 1.1^m * 0.9^n?

Hint: 11 and 3 are primes.

Adám

@LeakyNun APL: 0=1|-÷1+⊢

Leaky Nun

@Adám that's long

ASCII-only

@ASCII-only whoops actually 14 bytes

Adám

10:42

@LeakyNun I don't see how I can do it shorter, 0=1| int? - n-r 1+⊢ 1+r

I'd expect a short Brachylog answer.

Anonymous

@LeakyNun Basically yeah, are there non-negative integers m and n that satisfy N = X * (1+P)^m * (1-P)*n

Leaky Nun

@Mego It isn't possible for N=100, X=50, and P=0.1.

Anonymous

One more correction: the result of each operation is floored

Leaky Nun

what?

Anonymous

So the operations are X = floor(X*(1+P)) and X = floor(X*(1-P))

Leaky Nun

10:44

that's very... unmathematical

Anonymous

I can use the symbols instead if you'd prefer :P

Leaky Nun

I mean the question itself, not the symbols

I refuse to think about it.

Anonymous

It doesn't lend itself to a nice neat formula

Mayube

So uuh.. I just googled branchylog

didn't get the results I expected

ASCII-only

@Mayube it's brachylog

Leaky Nun

10:50

@Mayube you have an extra n

Mayube

oooooh

Leaky Nun

brachy- means short

Adám

@LeakyNun I read that as "maybe you have an extra n"

Leaky Nun

@Adám I don't pronounce the name at all.

Anonymous

I'll post my question to Math.SE and see if there are any takers

Leaky Nun

10:51

@Mego yay I have more rep than you in math.SE

Anonymous

@LeakyNun Ok?

Leaky Nun

Ok.

Mayube

@Adám Mayube he's born with it, Mayube it's brachylog

Leaky Nun

@Mego you haven't posted any question

Anonymous

@LeakyNun Well yes, I'm still writing it. Patience.

Leaky Nun

11:04

@Mego I was talking about your past record.

Mayube

@Mego patience is for the patient

Anonymous

@LeakyNun Oh yeah I usually just read Math.SE stuff

ASCII-only

@Mego btw 50, 100, 0.1 is possible

For one with more steps I'd go something like 50, 100, 0.61 (this enters a loop if you just try and keep going towards the goal)

Anonymous

Please refrain from using assignment in a mathematical context. — Kenny Lau 34 secs ago

Anonymous

@LeakyNun Ok now you're just being aggravating

Leaky Nun

11:16

@Mego I'm sorry if it causes that impression.

Anonymous

Offering a suggestion for a better notation would be much more helpful and much less aggravating

Leaky Nun

I don't actually know what I should use in that context... I would use sequence

but that would be too formal

just stick to $\leftarrow$ then.

Anonymous

I don't think the notation is causing any confusion. If it does, someone who is more experienced with formal math notation can edit it.

Leaky Nun

I've deleted my second comment.

but I'm wondering why you are using $*$ instead of $\times$ or $\cdot$ or ""

Anonymous

I considered framing it as a sequence, but the fact that the next value is chosen from two possibilities makes it un-sequency in my head

ASCII-only

11:20

@LeakyNun please use unicode symbols instead of mathjax when possible

Anonymous

@LeakyNun Inner programmer. He can't be restrained.

Leaky Nun

@ASCII-only I type howsoever I want.

Anonymous

@ASCII-only MathJax was clear enough, especially considering the post in question was written with MathJax.

ASCII-only

@Mego I know, but Unicode would look more consistent (i.e. it would look the same to people without the MathJax userscript)

Anonymous

@ASCII-only But we're literally talking about MathJax. I don't have the userscript, and it was clear as day to me.

Leaky Nun

11:23

<sidetrack> clear as day, unless you in China

Jan Dvorak

?

Anonymous

China is well-known for its smog issues

Leaky Nun

@JanDvorak popsci.com/why-is-smog-in-china-so-bad

Jan Dvorak

oh

Ilmari Karonen

11:47

@aditsu, is there a reason why & and | don't work between two chars in CJam?

That just cost me three bytes here. :/

aditsu

@IlmariKaronen mainly I didn't figure out what the result should be

Ilmari Karonen

@aditsu I would've expected a char, with the operation applied bitwise.

Erik the Outgolfer

@aditsu Of course work with the charcodes! Also, you've got a new release to release, if you forgot ;)

Ilmari Karonen

It's also a little bit weird to me that ^ between two chars produces an int instead of a char, but I guess that's not such a big deal.

Erik the Outgolfer

It's a big deal for me, since operations involving a char normally return a char.

aditsu

11:55

@IlmariKaronen that's one possibility, I'll have to consider whether it's the best choice

@EriktheOutgolfer yes.. haven't found the time yet, but I'll try to do it soon..

Jan Dvorak

printable ASCII isn't closed under bitwise AND, or even bitwise OR.

Erik the Outgolfer

What do you mean by closed under?

Ilmari Karonen

@JanDvorak True, but CJam's chars aren't restricted to printable ASCII.

Erik the Outgolfer

CJam's chars can be from 0 to 65535 (hence ci instead of i65536%).

aditsu

@IlmariKaronen I think it makes sense, it's just like the difference

char ^ int -> char; in reverse, char ^ char -> int

Erik the Outgolfer

11:59

I dunno if this is useful at all though.

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