The Nineteenth Byte

DJMcMayhem

19:00

@Mr.Xcoder MATL, 8 bytes: to3*Q2/*

Mr. Xcoder

@DJMcMayhem Wow nice.

Pavel

n=>from i in n
select i%2<0?i/2:i*2

C#

H.PWiz

@Mr.Xcoder Husk, 6 bytes: m?D½%2

AdmBorkBork

@Mr.Xcoder PowerShell, 38 bytes -- $args[0]|%{([int]($_/2),(2*$_))[$_%2]} Try it online!

Mr. Xcoder

@Pavel ==0 => <1

@H.PWiz Same solution here :-)

m?%d2yd/d2

Pyth

Pavel

19:03

Also C#: n=>n.Select(i=>i%2<1?i/2:i*2)

Mr. Xcoder

@Pavel Now you have <0 ಠ_ಠ

Pavel

No I don't

Now I have n=>n.Select(i=>i%2<1?i/2:i*2)

AdmBorkBork

Mine looks like a bunch of garbage and a couple 2s tossed in for good measure.

Mr. Xcoder

@AdmBorkBork Lol, that's a perfect description :-)

Pavel

Python: lambda l:[i*(i%2*1.5+.5)for i in l]

Proton: l=>[i*(i%2*1.5+.5)for i in l]

Mr. Xcoder

19:08

Jelly: ḤHḂ?€

Pavel

n=>n.Select(i=>i*(i%2*1.5+.5))

Can't tell if shorter than ternary and too lazy to count

AdmBorkBork

@Pavel 28 bytes using that (clever) approach -- $args[0]|%{$_*($_%2*1.5+.5)}

Mr. Xcoder

The same byte count, Python: lambda l:[[x/2,x*2][x%2]for x in l]

@Pavel That is not valid I am afraid

Should be l=>[i*(i%2*1.5+.5)for i:l]

AdmBorkBork

CMC: Given a list of integers, output the even elements if the list length is even, otherwise output the odd elements. Example: [4, 5, 7, 4, 6, 8] -> [4, 4, 6, 8]

Mr. Xcoder

Same byte count too: lambda l:[x*(x%2*2.or.5)for x in l]

@AdmBorkBork Pyth, 10 bytes: fq%T2%lQ2Q

I think I can do better though

Way too long, 8 bytes (Jelly)

AdmBorkBork

19:18

Yeah, that seems long, because I can hit 32 in PowerShell -- param($a)$a|?{$_%2-eq$a.count%2}

Mr. Xcoder

What's the average ratio Powershell:Jelly?

John Dvorak

Ruby: ->a{a.select{|e|e%2==a.size%2}}

AdmBorkBork

@Mr.Xcoder Usually seems pretty dang close to 10:1 for a CMC

Adám

@Mr.Xcoder Dyalog APL, 10 bytes: ⊢÷2*¯1*2∘|

Mr. Xcoder

@AdmBorkBork Ouch... I cannot do it in 3 bytes

@Adám APL is also tacit?

Sherlock9

19:20

Haskell, 51 bytes: f x|odd$length x=[m|m<-x,odd m]|1>0=[p|p<-x,even p]

Adám

@Mr.Xcoder Dyalog has three modes, traditional, direct, and tacit.

Mr. Xcoder

:o wow

Adám

@AdmBorkBork Dyalog APL, 12 bytes: ⊢(/⍨)2∘|=2|≢

@Mr.Xcoder Seriously, you should learn it (APL, not Seriously).

Mr. Xcoder

@Adám Although your opinion is heavily biased, I agree.

AdmBorkBork

Noo, learn PowerShell :p

Mr. Xcoder

19:24

@Adám I've heard something about an APL course or something? :P looks around - I'd like to learn it.

And BTW gtg o/

Adám

@Mr.Xcoder Well, if you like dense code, but want a real-life language, you basically have to choose between APL, J and K — all of which are APLs.

Sherlock9

Haskell, 34 bytes: f x=[m|m<-x,odd m==(odd$length x)]

Mr. Xcoder

@Adám I'll ping you in the APL chat room when I decide to start learning it.

Adám

@Mr.Xcoder Yeah, I'll get around to holding more formal classes in the APL chat soon (TM).

@Mr.Xcoder OK. G'nite.

quartata

19:37

oh yay more ordered comparison errors

mınxomaτ

At this point, just use clang 3

quartata

I honestly don't know how to get Xcode to do that

VPC emits Xcode projects on OS X instead of a Makefile like on Linux which is the only reason I'm bothering with any of this

luckily there aren't that many

it's a quick fix

> reinterpret_cast<uintptr_t>(GetLocalTeam()) > 0

zomg modern C++

mınxomaτ

8

A: How do I make Xcode use an alternative version of clang?

The easiest option (also the easiest to reverse) is to add the CC build flag. Go to your project's or target's build settings, and choose Editor --> Add Build Setting --> Add User-Defined Setting from the menu. Name the flag CC, and set the value to the path to your Clang binary. You can c...

Seems pretty straight forward.

quartata

ah yes

they have that set up to point to a wrapper for CCache

I can probably change the wrapper itself to use GCC instead though

mınxomaτ

@quartata No CMake output? Boo...

quartata

19:42

developer.valvesoftware.com/wiki/Valve_Project_Creator

pretty sure it predates CMake

I think they use it to build goldsrc too

mınxomaτ

CMake is 17 years old.

quartata

yeah

mınxomaτ

Odd

quartata

although it looks like HL1 just uses regular VS solutions

So I guess that dates VPC at 2003 not 1998

Pavel

@AdmBorkBork I'll learn it when I can use it with grep.

Until then, I'll stick to mingw bash

AdmBorkBork

19:59

@Pavel That defeats the entire purpose of the pipeline

HyperNeutrino

20:15

@icrieverytim ಠ_ಠ that reply was like several weeks late xD

AdmBorkBork

while(solvingProblems)
{
//TODO: fix infinite loop
}

HyperNeutrino

lol

I wonder when I'll be able to get a chance to bounty Tetris GoL :P

quartata

Save your bounty for Pong

~~otherwise El'endia will hit 10k before me~~

HyperNeutrino

what's pong

quartata

I kinda wonder how long Tetris will stay up on the featured tab

@HyperNeutrino we're making pong in GoL next

HyperNeutrino

20:24

:o

is that already a question or has that not been asked yet?

quartata

I think the plan is we're going to ask it as a question after we finish upgrading our stuff but before we actually write it

Not entirely sure

HyperNeutrino

ah ok

SEJPM

Is it normal to let the decision of list-based vs entry-index-based output to the golfer in a standard sequence challenge?

AdmBorkBork

@SEJPM Can you give an example of what you mean by entry-index-based?

SEJPM

@AdmBorkBork "given n output the n-th entry of $sequence"

vs "given n output the first n entries of $sequence"

AdmBorkBork

20:37

Ah, as opposed to "output the first n"?

Personally, I allow for either, as output formatting isn't (usually) the interesting part of the challenge.

popojan

@MartinEnder Hello Martin, I have seen your Vector Racing Grand Prix contest. I used to play the game a lot and I am wondering if anyone could be interested in this variant with high branching factor: jsfiddle.net/qud9zm2t/17. Might be too complex for a codegolf entry.

SEJPM

@AdmBorkBork ok, thanks :)

flawr

20:57

@Pavel No idea, I think it just plays notes.

@orlp well yes, but there are heavy books about GF and extracting goefficients:)

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

Golf the "fake-primes"! code-golfmathsequence Introduction / Background In a recent discussion in the crypto chat I was challenged to discuss / help with the Fermat primality test and Carmichael numbers. This test is based on the premise that a^(p-1) mod p==1 will always hold for primes p, b...

flawr

@orlp I think you're looking for "discrete" b-splines:

(x^b - 1)/ (x-1) = x^(b-1)+x^(b-2)+...+1

or as vector of coefficients: (1,1,1,1,1,1,...,1)

if you take a=2 you calculate the discrete convolution of (1,1,1,...,1) with itself

and for a general a it is just the discrete convolution of (1,1,1,...,1) with itself (a-1) times

When calculating b-spline basis function you have the piecewise linear spline by using a rectangle function, for the piecewise linear function you convolve the rectangle function with itself generating a triangle function e.t.c.

to calculate the repeated (a times) discrete convolution more efficiently you need to do a large enough padding, then FFT it, take it to the a-th power and IFFT it

New Sandboxed Posts

21:15

0

A: Sandbox for Proposed Challenges

Is my Sukkah Kosher? Do not rely on this text for questions of Jewish law! You will be given a floor plan of a sukkah as follows: A rectangular 2D text (in any reasonable format). The first and last rows and columns will consist of printable ASCII (32-126). All interior characters will be...

flawr

21:34

@orlp here: math.stackexchange.com/questions/2456408/…

DJMcMayhem

@NewSandboxedPosts @Adám Isn't it spelled Acceptable, not Acceptible? (Or is that a regional thing?)

Adám

@DJMcMayhem Both are accept?ble, but changed. Thanks.

DJMcMayhem

Accept[ai]ble

flawr

Acceptaible?

Riker

@flawr it's only [ai] not [ai]+ :p

Adám

21:38

@flawr No, [ai] only matches a single char.

DJMcMayhem

Pronounced Accep-table

flawr

ah that is supposed to be a regex:)

Adám

I used wildcards.

@DJMcMayhem Any other comments? About the content maybe?

DJMcMayhem

I didn't actually read the challenge because the typo(?) stood out so that's all I noticed :P

Riker

@quartata you available for C help?

nethack w/ menucolors isn't compiling well

unix doesn't like posix

Adám

21:41

@DJMcMayhem I'm so sorry for disturbing your fine sense of spelling.

DJMcMayhem

Sorry, that's not what I meant

More just that it was a quick glance-over

Anonymous

@Riker Why not take your question to U&L?

mbomb007

@FunkyComputerMan Changed your name, I see.

Zwei

calculators supporting TI-basic have a built-in byte counter

Leaky Nun

@orlp

Zwei

21:54

from home screen: mem -> 2 -> 7

Leaky Nun

I used tomato sauce instead of pesto

my chicken was tasteless :c

every meat that I cook is tasteless

Zwei

the number to the right of the program name is total file size in RAM

appears to be 9+name length+contents of program

I think this observation is good progress towards resolving the TI-basic byte counting conundrum

the debate at this point is as follows: should the header and filename be included in the total byte count, or should we subtract these from the displayed value

(also, interestingly, the TI-basic encoding seems to be variable-length, a few tokens seem to use 2 bytes)

Adám

@LeakyNun Meat doesn't really have much taste. If you want to taste it, taste it as it is.

Leaky Nun

@Adám but it tastes great when I eat it from elsewhere

Adám

@LeakyNun It probably isn't the meat you're tasting, but everything else.

Leaky Nun

22:08

@Adám hmm

or do I need more time in order for the sauce to soak into the meat

Adám

@LeakyNun Fool-proof (?) chicken: Spread it in a pan. Sprinkle it with onion powder, as much as will stick. Put it in the oven for 1-1.5 hours at 175°C. Serve.

Leaky Nun

interesting

ATaco

I prefer Eggwash, Crumb, fry until golden brown.

Add Tomato Paste, ham, and cheese, grill until the cheese melts.

Adám

@ATaco I can imagine a whole host of things that can go wrong there.

ATaco

Chicken Parmigiana.

Probably, but it's something you get the hang of doing.

Adám

22:13

@ATaco A lot of people cannot cook even basic food. Recipes make way too many assumptions for them.

Fool-proof (!) steak: Serve. (Well, I like it like that.)

ATaco

Good point, there's a reason I'm no tutor :P

caird coinheringaahing

22:33

Oh god, is another cooking lesson going on?

Leaky Nun

@cairdcoinheringaahing I need to cook

it costs like ten times less than if I go out

every food in uk costs me an arm and a leg

Adám

@LeakyNun Wait, you're in the UK?

Leaky Nun

@Adám yes

Adám

@LeakyNun You could come over to me for dinner…

Leaky Nun

@Adám where are you?

caird coinheringaahing

22:35

@LeakyNun Not if you live with your parents :P

Adám

@LeakyNun London.

Leaky Nun

@Adám how do you plan to give me your address

presumably not here?

Adám

@LeakyNun Are you anywhere close?

Leaky Nun

@Adám yes

[London is big, but]

caird coinheringaahing

:O Taking code golf outside of PPCG and into IRL!? Shocking

I feel like I'm interrupting a conversation between you two. I'll slink back into the shadows :(

Adám

22:37

@LeakyNun Based on my avatar, you should be able to deduce that I'm in N16 or E5.

Leaky Nun

@Adám how can I do so based on your avatar

ATaco

A friendship born in codegolf~

Adám

Stamford Hill

Stamford Hill is an area in north-east London, England, located about 5.5 miles north-east of Charing Cross. The area is known for its Hasidic community, the largest concentration of Haredi Jews in Europe. Due to their high fertility, the area has one of highest birthrates in the UK, with a crude birth rate of more than 25 per 1,000 of the population, twice the UK average. Stamford Hill is also the name of a section of the A10 road running through the area from Stoke Newington High Street to the start of Tottenham High Road. == Boundaries == === Informal boundaries === The more usual, and loose,...

caird coinheringaahing

CMC: Given a picture, determine Adám's postcode

Leaky Nun

@Adám hmm, I live in North Acton

New Main Posts

22:40

1

Q: Like a path-segment; touched for the very first time

Given an ordered list of 2 or more 2D cartesian points, output a truthy value if either the path touches itself or self-intersects; otherwise output a falsy value if it does not touch itself or self-intersect. You may assume that consecutive points in the list are distinct. Examples: (0,0), (1...

Helka Homba

I wish I could visit London/UK. Bunch of internet people I admire live there. Tom Scott, Brady Haran, Geoff Marshall.

Adám

@LeakyNun W3? Hm, yeah that's quite the opposite side. But I'm home all of next week if you want to stop by and get an APL lesson…

Leaky Nun

@Adám LOL

how am I going to get your address then

Adám

@LeakyNun You can email me: adam@

Leaky Nun

dyalog.com?

Adám

22:42

@LeakyNun what else?

Leaky Nun

how do I know

sent

ATaco

I love how VSCode has full built in Git support.

Helka Homba

@ATaco That is nice. So does JetBrains stuff, e.g. Android Studio

Adám

@LeakyNun If you search the APL chat room, you can also find my mobile number (but don't call now as my family is sleeping – speaking of which…)

@HelkaHomba I change trains in the town where Jon Skeet lives on my way home from work.

Anyway, sleep tight everyone. I'll be back next week.

Helka Homba

@LeakyNun Also a good food thermometer helps to make sure meat is not over/undercooked. Overcooked chicken is dry and bland and tough.

Leaky Nun

22:53

@HelkaHomba hmm

ATaco

(Now I really want some chicken)

Leaky Nun

Chicken Attack // SONG VOYAGE // Japan //

►

ATaco

@AdmBorkBork RProgN 2, 14 bytes ]L2%x={2%xe¬}-

Helka Homba

@LeakyNun And America's Test Kitchen/Cook's Illustrated (run by same people) is a great place for food + kitchen equipment reviews. e.g. cooksillustrated.com/articles/… (some of their reviews are blocked until you join but you can usually find mention of the stuff elsewhere)

Leaky Nun

@HelkaHomba thanks

Pavel

23:07

reddit.com/r/ProgrammerHumor/comments/73zj4d/…

HyperNeutrino

@ATaco what are friends /s

Helka Homba

@Pavel Remember that Apple thought having a "right click" was too confusing until about 2010

And now the iPhone is losing buttons...

HyperNeutrino

soon it will just be a sheet of glass with images

Helka Homba

Until we perfect the brain-tech interface

Riker

@Mego it's specifically about nethack, and it's easier to ping him that to write up a question

plus, I'm not sure what i should include in the question, as it's kinda a giant project w/ like 4 files linked to this error

ATaco

23:32

@Mr.Xcoder Lua, 27 bytes require"equa"t=a*b*sin(t)/2 Takes degrees in radians.

quartata

@Riker what up

HyperNeutrino

@ATaco 0/10 taking input as variables in source code

ATaco

But I'm not

Read the code again.

Leaky Nun

@HyperNeutrino require"equa"

HyperNeutrino

oh

wait what exactly is require

ATaco

23:34

Runs a module.

HyperNeutrino

hm so like python import?

ATaco

Essentially, yes.

HyperNeutrino

ok

ATaco

But equa does a lot of things that makes golfing easier.

HyperNeutrino

ooh cool

ATaco

23:35

Like making sqrt(a^2+b^2) a perfectly fine definition of a function which calculates the hypotanuse of a triangle.

HyperNeutrino

hm ok cool

i cri everytim

@HyperNeutrino not like I had a choice :P

HyperNeutrino

hm wait were you suspended? (<-- technically breaking rules here lol)

i cri everytim

@cairdcoinheringaahing a little bit of profile editing can't hurt :P

@HyperNeutrino yeah lol

HyperNeutrino

oh ok :P

Riker

23:46

@quartata tl;dr: menucolors hates me

include/color.h:64:30: error: field has incomplete type 'struct
      re_pattern_buffer'
    struct re_pattern_buffer match;
                             ^
include/color.h:64:12: note: forward declaration of 'struct re_pattern_buffer'
    struct re_pattern_buffer match;

and:

include/decl.h:596:2: error: unknown type name 'regex_t'
        regex_t match;
        ^
include/decl.h:651:5: error: unknown type name 'regex_t'
    regex_t match;

quartata

Compiler?

Riker

shudders clang

this is the error from make install

i cri everytim

Also I'm very mad that I wasn't in chat when Tetris in gol happened >:U

HyperNeutrino

rip

I wonder when I'll get a chance to bounty :P the bounty crossover always overnight for me :( :P

quartata

@Riker second error is most definitely it somehow missing POSIX regex so I'd try GCC

i cri everytim

23:49

But hey at least I got my bounty on it

Riker

@quartata fixed hte first error, the regex_t one is somethign though

@quartata how the heck do I do that though >_<

gcc runs clang

quartata

You get actual GCC

ATaco

I need to get better at C.

i cri everytim

@HyperNeutrino yeah I didn't catch it the first few times, but I'm currently in a completely different time zone lol

ATaco

Working with anything but the basics scares me.

HyperNeutrino

23:50

@icrieverytim ah ok :P

quartata

@Riker hpc.sourceforge.net

Homebrew won't give you OpenMP by default, it's trash

Use those binaries

Riker

ah cool

DJMcMayhem

CMC, inspired by a recent SO question I just answered: Given a multiple line string, replace every space at the beginning of a line with an equal number of periods.

int main()
    {
  std::cout << "hello world";
        return 0;
}

int main()
....{
..std::cout << "hello world";
........return 0;
}

There's a test case

Helka Homba

question link?

DJMcMayhem

Sure

New Sandboxed Posts

23:53

0

A: Sandbox for Proposed Challenges

How Many Unique Primes? One way to represent a natural number is by multiplying exponents of prime numbers. For example, 6 can be represented by 2^1*3^1, and 50 can be represented by 2^1*5^2 (where ^ indicates exponention). The number of primes in this representation can help determine whether...

DJMcMayhem

(I was tempted to answer in V, but I figured that would not be entirely appreciated :P)

Riker

holy crap that worked @quartata

thank you so much

i cri everytim

today on "covfefify a string" stats:
"Build a working game of Tetris in Game of Life" is the first challenge to beat covfefify in votes and has moved up to the first place and will also probably hit 1k votes

quartata

@Riker it's funny how all problems go away once you stop using Clang

last few days have definitely reminded me of that

ATaco

@DJMcMayhem JavaScript (Node.js), 45 bytes v=>v.replace(/^ */gm,n=>`.`.repeat(n.length))

Definitely not the best solution, just my first thought.

Helka Homba

23:56

@DJMcMayhem Real programmers hate golfers but really real programmers are golfers.

DJMcMayhem

Two V solutions: òí^ * /. (9) or Î^hviwr. (8)

ATaco

Real Programmers use Butterflies.

Christopher 2EZ 4RTZ

Low key XKCD reference :P

Riker

@quartata yes

except for my current nethack problems: mind flayer + paralysis = "help I forgot literally everything"

Christopher 2EZ 4RTZ

@icrieverytim what was that ping earlier about

i cri everytim

23:59

Click the reply button :P

Christopher 2EZ 4RTZ

Oh

Leaky Nun

@DJMcMayhem :c I'm trying a v solution

Christopher 2EZ 4RTZ

Anyone have the link to Desmos programming docs?

I can't find -_-

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