The Nineteenth Byte

Alex A.

10:00 PM

It's not night...

@TimmyD I'll throw myself so that you can catch me later

Brain Lot

Lol. This chat message from a coworker:
"The Internet is 50% porn, 25% dishonor, and 25% RFCs for SNMP."

Anonymous

Is this a good challenge specification, or am I still missing stuff?

CoolestVeto

Don't forget the 1% bigotry!

Roujo

@AlexA. It's morning when people arrive and it's night when they leave. It's a metaphor for friendship.

@CoolestVeto And 20% underestimating how much each group really is

Alex A.

@Roujo o_o

Wth, I've rep capped more on meta than on the main site.

In other news, I've eaten a lot of pistachios today.

Roujo

10:19 PM

In other news, I got a pop-up for a tag I'm monitoring on SO and as it turns out it was a question asked by an coworker from my previous job ^^

I haven't had pistachios, though, which is a shame because I like pistachios

Alex A.

You should eat some pistachios then

@Roujo Shit son, this is 2spoopy

2

Roujo

@AlexA. F# isn't exactly a mainstream language, so I guess that's bound to happen =P

Alex A.

I think it's fairly mainstream

It's more mainstream than Julia is

Roujo

True enough

I just know that there are only two companies that use the language in my city =P

Alex A.

In all of Montreal?!

Roujo

10:25 PM

Pretty much

Or if there are more, they're not advertising =P

nait gais

Hey @Liam

hey what's up

Not much man. :D Are you amazed by Dennis's ability to win any question yet?

Liam

I still am amazed...

I actually have to retime his thing today because he just never stops

CoolestVeto

10:37 PM

kek

Has he multi-threaded it yet?

Eridan

Wow, the PPCG redesign looks really good!

running without js?

@Liam It didn't load

>_>

10:52 PM

alt.org/nethack/dudley/?370

CoolestVeto

TIL ( ͡° ͜ʖ ͡°) = ( ͡° ͜ʖ ͡°)

Cᴏɴᴏʀ O'Bʀɪᴇɴ

._.

Dennis

11:10 PM

@CoolestVeto My code is very memory-intensive. Multithreading won't help.

CoolestVeto

¯\_(ツ)_/¯ I honestly wouldn't know, so okay! :D

Dennis

Just look at the timings. User + system take 29.333 CPU seconds, but the whole thing takes 33.003 seconds wall time.

The remaining 3.67 seconds, the program cannot compute anything because data is getting cached.

Liam

@Dennis just retimed yours

what was the info about my computer you wanted?

Dennis

Huh, worse than expected... Oh, well. ¯\_(ツ)_/¯

@Liam RAM speed (MHz).

Liam

Configured Clock Speed: 800 MHz

is that what you're looking for?

Dennis

11:19 PM

Yes, exactly.

Thanks.

OK, I have 1867 MHz RAM. That certainly explains the speed differences.

Liam

Cheap computer is cheap

well not that cheap. I get the feeling you just have an expensive computer

Dennis

I'd probably have to tweak Phi_prec_max for your computer. That's pretty difficult without access though. :P

El'endia Starman

Apparently, you can't hit yourself with your own rocket in Halo 3, 4, or 5. It amuses me somewhat that even with the insane computing power available, these particular collisions are not checked. If the rocket is deflected in any way, it does become dangerous to the shooter again.

Liam

I have never used java before but need to time this java answer. What package should I yum install for this...

There are literally so many things with java in them

Dennis

It's java-1_8_0-openjdk* on openSUSE. Not sure about CentOS.

Liam

11:24 PM

does java-1.8.0-openjdk.x86_64 : OpenJDK Runtime Environment sound right?

Dennis

Yep. Make sure you get the devel package as well.

Don Muesli

@flawr Nice one

1

A: Sandbox for Proposed Challenges

Vandermonde determinant code-golf math Given a vector of n values (x1,x2,x3,...,xn) return the determinant of the corresponding Vandermonde matrix. This determinant can be written as: Details Your program/function has to accept a list of floating point numbers in any convenient format that...

Liam

java-1.8.0-openjdk-devel.x86_64 : OpenJDK Development Environment

is what I'm going with then

Don Muesli

Hey, @Dennis! You haven't been answering many challenges lately. Busy? :-)

Liam

spending all his time counting primes

Dennis

11:27 PM

Pretty much. Liam's prime counting challenge has consumed pretty much all my free time.

ninja'd

Don Muesli

:-)

Liam

I wouldn't be surprised if you have the fastest prime counting implementation ever for 32bit ints

Dennis

I'm pretty sure I don't.

Still getting better though.

Easterly Irk

Is c/c++ the fastest langauge available?

Dennis

No, writing in assembly is generally faster. I have no idea how to do that though.

Liam

11:29 PM

Pretty much besides assembly or machine code for a cpu

Easterly Irk

@Dennis I think lynn knows how?

Don Muesli

@Dennis Counting primes in assembly? LOL that would be a feat

Easterly Irk

3

A: Default for Code Golf: Input/Output methods

Assembly programs may write output to some specified memory location If there are no I/O devices available, an answer might consist of a subroutine that writes its output values to some specified memory location (e.g. write a machine word to $0000).

Maltysen

but things like scipi often have faster algorithms, unless you put in as much work as dennis

Easterly Irk

New meme suggestion: Nobody out-prime-counts dennis.

Liam

11:31 PM

I hate that java makes you declare classes in files with the same name...

just let me do what I want..

Dennis

Haha.

Liam

Okay so I did javac myfile.java and now I have myfile.class

Dennis

Now do java myfile.

Liam

oh

lol

Dennis

When you have some time, could you maybe time my code with Phi_prec_max set to 512 and 1024? It's pretty much impossible to estimate which would be faster on your computer...

Doesn't have to be soon. Maybe when you time my next edit.

Liam

11:34 PM

I'll do it right after this or I'll forget

Dennis

(Already working on something.)

Ah, OK. Thanks!

Liam

> Enter numbers to compute pi(x) for (Type "=" to start):
> Probably won't work with values close to or more than 2^31

java take commandline arguments plz

Don Muesli

There should be a way to sort questions by bytes (as declared in the title). Finding the question to accept can be a pain if you have received many answers

Dennis

Ooh, that Java program does its own timing. It won't matter for this one since it isn't particularly competitive, but that's not a fair comparison to other submissions that do not do the same.

Liam

Yeah.

If it was faster I would insist that I be able to time it the same way

There are some comments there about how accurate the timing used is

I admit to not knowing anything about it though.

Easterly Irk

11:37 PM

@CᴏɴᴏʀO'Bʀɪᴇɴ ಠ_ಠ you need more comix

Cᴏɴᴏʀ O'Bʀɪᴇɴ

Sorry, school's been happening :P

Dennis

@Liam Accurate timing is pretty difficult. Even in runlevel 1 (so there's nothing running besides it), my code is sometimes unusually fast, other times unusually slow. Larger scoring cases would have helped. I'm familiar with the problem.

5

Q: What should I do with my fastest code challenge?

So I've vastly overestimated the processing it would take to find domino tilings of a rectangle and wrote up a challenge that has gotten a little weird. First of all, the execution times are really low. For both answers, execution takes roughly the same time as compilation. The answers (both in ...

Liam

Yeah. I should have changed the scoring cases early on

Well, after I saw your answer at least

At this point I just don't want to have to retime all the other entries

I am however thinking of writing another fastest code challenge in the next couple of weeks so this is all stuff to keep in mind

Dennis

That would have required 64-bit (or at least unsigned 32-bit) support, so it would break all exisiting answers.

New Main Posts

-1

Q: Self Rewriting Code

Very straightforward: Create a program that will write it's own source code to it's own source code. Similar to a quine, yet very different. The objective of this challenge is to create a program that will overwrite it's current source code with the same exact code. This must be done within on...