The Nineteenth Byte - 2015-02-14

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Martin Büttner

12:37 AM

done with writing documentation for the first Retina version:

github.com/mbuettner/retina

@Sp3000 you might be interested ^

12:52 AM

Yay an excuse to solve everything in regex now

Martin Büttner

more like the legitimation to solve anything in regex (for PPCG anyway) ;)

I'll add my remaining feature ideas as issues, but let me know if you have any :)

Is there any debugging or is that coming later?

regular expressions' triumph is now all-encompassing?

Martin Büttner

@Sp3000 not yet, although I'm not sure how I'd add that. it's not like I've re-implemented the regex flavour

just use standard regex debbuging website ;p

Martin Büttner

1:04 AM

oh, you know what would be amazing? an overlapping-matches mode.

although I can also get that if I add support to print capturing groups instead of matches

reg exp triumph is nearly apocalyptic

Oh, yes please

Also an atoi for -?\d+ -> empty strings, although I'm not sure if that's cheating?

Martin Büttner

nah, I think that's cheating ;)

reg exps translating iteratively nullify archrivals

Martin Büttner

only now did I realise that you've been brainstorming acronyms again...

1:09 AM

reg ex tool initiates nuclear apocalypse

regular expressions! this is nice acronym

@MartinBüttner Retina seems to be working under Mono, but I have no idea how to test it. I'm supposed to provide two .rgx files or something, right?

Java Regular Expressions aren't as near as powerful as the other flavors. I wish they were. :(

there's no option to supply the regex on cmd line/?

Martin Büttner

@Doorknob you can provide the .rgx and the .rpl file (in that order) from the Examples folder and then give it baa|a>ccbaH,b>cca,c>cc on STDIN.

@feersum not yet

I'll probably add something like -e

@TheBestOne there is one good thing about the Java flavour: it comes closest to arbitrary-length lookbehind (after .NET) ... but for all I know that's a bug and not a feature :D

@MartinBüttner Output: Hcccccca

Is that right?

Martin Büttner

1:18 AM

yep

hooray!

(one thing, though: the generated file is called Modes.exe. pretty sure that's not what it's supposed to be called)

@MartinBüttner Through capture groups?

Anyway, to compile with Mono, mcs Retina/Retina/*.cs

Martin Büttner

@TheBestOne no, you can do (?<=.*) as long as it goes all the way to the beginning of the string

@Doorknob thank you

okay, done adding feature requests

thanks for the feedback

I'm off to bed... now to wait for the next challenge that can be reasonably answered in regex ;)

@SamWeston How much is a missile allowed to turn?

1 hour later…

2:47 AM

I haven't really been able to update the Morra leaderboard very often. I am rather busy this weekend. By "rather busy" I mean no access to a computer from 6:30 AM to 9:30 PM.

2 hours later…

4:20 AM

@SamWeston It would probably be better to accept a list of coordinates for their missiles to.

11 hours later…

3:16 PM

Knock Knock

Who's there?

A little old lady

:D

1 hour later…

4:29 PM

@SamWeston What should happen if a missile collides with the boundries?

Martin Büttner

Regular Expression Tools Inspire No Acronyms

Regular Expressions: This Is Not an Acronym

I like them both :D

4:54 PM

Reading entirely this initialism's not advised

When was Sam last here?

@TheBestOne This Sam?

Martin Büttner

@TheBestOne 1 day ago

I don't know if Sam ever visited this room. If he did not, you should invite him here, otherwise he will never see your pings.

Martin Büttner

yes, he's been in this room

5:00 PM

k

Ok, thanks. He must be busy right now.

@SamWeston Here's the controller: github.com/TheBetterOne/Missile-Wars Ping me if there is anything wrong.

Anyone want to review it?

Does anyone know how to make an animated GIF of a changing char[][] in Java?

5:39 PM

save frames to netpbm format, convert with imagemagick

@TheBestOne

or do you want to see the actual characters? I think it might be able to convert text to image too

Yah, that's what I was thinking.

yes, imagemagick can do that

just write some text files and convert

What commands?

"convert *.txt foo.gif" already works, you can tweak it with more parameters

Thank you! That should be all I need.

5:53 PM

imagemagick, the golfing tool for images :p

:)

6:18 PM

@aditsu How to use mono spaced font?

try "-font fontname", and check imagemagick.org/Usage/text for more

6:40 PM

Any thoughts on a special Valentine's day PCG challenge? something like drawing a heart of a specific size?

@NateKerkhofs Already been tried (sort of): codegolf.stackexchange.com/q/45659/32700

7:08 PM

@TheBestOne I understand that the problem with that was that it didn't have a clear winning criteria. I was considering a 20x20 heart made from asterisks and code golf

7:21 PM

there's also codegolf.stackexchange.com/questions/19123/draw-the-heart-shape

hmm, has the rose program been done here? paulscottinfo.ipage.com/art-of-maths/3rose.html

1 hour later…

New Sandboxed Posts

8:29 PM

0

A: Sandbox for Proposed Challenges

Weighting primes code-golfnumbersprimes The weight of a number is the sum of its digits plus the number of its digits in the base 10 representation of the number. E.g. weight(139) = (1 + 3 + 9) + 3. (This is a made-up definition by me.) You should write a program or function which when provide...

9:07 PM

@aditsu fz not supported still ?

9:24 PM

z is unary

ah well, so that is another feature request :D

make z work for 2 arrays on the stack

also, your code seems to crash on some examples

so LM]z converts to LMz

if I make z work with 2 arrays, then you won't be able to transpose a 3*3 matrix

true

9:28 PM

I predict that someone is going to beat us severely in J or APL

Pyth will be the first

fixed mine , 1 byte shorter

* golfing * :p

you dont seem to check all possible combinations that sum to S, what is your algorithm ?

9:46 PM

it's greedy, I start with all zeros, and increment the most "needed" element

S times

any proof that it will always work ?

I haven't tried to prove it rigorously, but I think it's correct :D

I can save 1 more byte if I take the input like you do

he has not given any order

feel free to assume

It is correct

if there was a good m*, like as Pyth # , this would have been the solution - q~:Sf*:L,S),e*{1bS=},{L]z::-Yf#:+}$0=p

9:57 PM

I used the order from the statement and examples, I don't want to ass-u-me :p

what do you mean good m*?

nobody wants to ass you and me

@aditsu See Pyth's #

where?

Array combination_length e*

to get all combinations from the Array of size combination_length

What are you assuming?

what does that have to do with m* ?

@glebm whether the input can be taken in a different order

10:03 PM

@aditsu m* gives cartesian products, its like Array 2 e*

You can use any input format at all, or just provide a function that accepts the input as arguments.

@Optimizer m* can be used on 2 different arrays; also if you do [a b] 2 e* do you get all 4 combinations?

@aditsu you might as well extend m* to do the same thing

it's not an extension, it's a different operator

@aditsu yes and yes

@aditsu its almost like + for append and sum

10:05 PM

um.. I had only one question, you give me 2 yeses?

@aditsu Array Array m* gives cartesian product, Array number m* gives what I am asking

@glebm ah you're the author :) ok I can change it

@aditsu before the ; part

hmm so you want to overload it like that... I see

@aditsu Any input format is OK

10:08 PM

@aditsu e* is free too, so it doesn't really matter. re-using seems better idea to me as the meaning is similar

is e* from Pyth or a thought-up CJam operator?

thought up

# from Pyth

pyth.herokuapp.com

ok

on 2nd thought.. maybe the original order was better :p

10:26 PM

I have another idea, wonder if it will be shorter

10:37 PM

hmm, simpler idea, longer code

11:34 PM

is there an 'average computer' spec on the meta?

Martin Büttner

11:57 PM

I doubt it

hmm, probably has an amtel cpu with 2.37 cores, 3.79 GB ram and runs mandoux

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