The Nineteenth Byte

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

7:18 PM

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

7:20 PM

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

7:24 PM

@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

7:37 PM

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

7:42 PM

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

7:59 PM

@Pavel That defeats the entire purpose of the pipeline

HyperNeutrino

8:15 PM

@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

8:24 PM

: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

8:37 PM

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

8:57 PM

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

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

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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

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