The Nineteenth Byte

@quintopia: Yes, the corrections you've pointed out are technically correct. However, remember that the cones in our eyes are primarily sensitive to red, green, and blue light, so it makes sense to separate those out.

quintopia

@El'endiaStarman that is also misleading

Anonymous

I know the formulas for colors, but for the most part, they are meaningless to me

El'endia Starman

8:00 AM

In Mego's case, he's missing basically all the sensitive-to-blue cones.

Anonymous

And a good chunk of the green ones

quintopia

the cones in our eyes are differentially sensitive to ranges of colors. yellow just happens to excite both L and M cones in the same way that a particular mix of red and green light does.

El'endia Starman

true

Anonymous

Really it's a wonder I'm not achromatic :P

Anonymous

Here's a fascinating fact: some people aren't aware that color tv and movies were ever created

El'endia Starman

8:02 AM

@Mego Is there any other part of your vision that's adversely effected, or is color-blindness the only problem?

Anonymous

@El'endiaStarman I'm moderately myopic and have pretty bad astigmatism in my left eye

quintopia

@Mego because they are achromatic and never realize it? or just because they live in a place without tv and movies?

Anonymous

I can see ok without glasses, but there's a lot of squinting involved

Anonymous

@quintopia Both, but I mainly meant the first

quintopia

@Mego You'd have to live with people who are also achromatic. Otherwise, you'd eventually notice a difference between your perception and theirs

El'endia Starman

8:04 AM

Not necessarily.

Anonymous

My prescription is 2.75xL 3.50xR

Anonymous

^^

Anonymous

An individual who is achromatic from birth could feasibly go their entire life without ever considering that their vision is abnormal

Anonymous

How do you know you're missing something when you never had it?

El'endia Starman

One of my friends said some time ago that they went for many years (like, around 20) before they realized that they had synesthesia.

quintopia

8:06 AM

i mean, there'd have to be some sort of conditions for you never to look at an optical diagram and go "that diagram makes no sense"

Anonymous

@quintopia What do you mean?

quintopia

no one with access to the internet, and the wealth of colorblindness tests all over it would not notice eventually

Anonymous

Why would you take a colorblindness test?

Anonymous

They're not routinely administered

feersum

idk I think there were colorblindness tests at school about 5000 times

Anonymous

8:09 AM

I never took one at school

Anonymous

Well, not until high school, after I had already known I was colorblind

El'endia Starman

How/when did you figure it out?

Anonymous

I don't exactly remember

Anonymous

I was pretty young, like 7

Anonymous

I think my sister suspected I might be colorblind, and got me to try a test she made (one of those dot tests) with markers

Anonymous

8:10 AM

But it's been a few years :P

El'endia Starman

haha, yeah

Anonymous

My grandfather is also colorblind, and he didn't find out until he was like 30

El'endia Starman

That reminds me of a science fair project I did in middle school (which got an Honorable Mention, probably mostly because it was more research than it was project) where I looked at how our eyes react after being inundated with lots of white light. I actually had a color-blind person do the same thing. I don't remember what he saw. But I remember what prompted that experiment.

I had been out in the snow for like three hours or something, then I came inside. I remember the white walls of the house being magenta, and I had that kind of after-effect for a couple minutes. It was pretty weird and cool too.

Anonymous

Whenever that happens to me, everything looks more blue for a while

Anonymous

I dunno what color it actually appears to be, but it looks blue

El'endia Starman

8:15 AM

Really? That's fascinating.

Anonymous

It's probably affected by what cones in your eyes don't work

Calvin's Hobbies

Who wants to play battleship?

CSᵠ

@Calvin'sHobbies up

Calvin's Hobbies

Hmm?

Can other people see anything?

CSᵠ

not sure, i set my ships

waiting for you @Calvin'sHobbies

Calvin's Hobbies

8:23 AM

I was looking for a game more than two people could play :/

Anonymous

Mafia

CSᵠ

@Calvin'sHobbies that is a 2 player game

usually

El'endia Starman

That's an interesting idea. N-player Battleship.

CSᵠ

yup, ppcg it?

waiting for opponent @Calvin'sHobbies ....

Calvin's Hobbies

I mean I couldn't find one, no simple ones at least

El'endia Starman

8:25 AM

It'd have to be a KotH.

Calvin's Hobbies

@CSᵠ Where? I'm playing Starman

CSᵠ

@Calvin'sHobbies en.battleship-game.org/id76499960

the link you sent

Calvin's Hobbies

I thought it'd only be good for one game. Maybe not

Anonymous

victoryyyyy

CSᵠ

no

El'endia Starman

8:31 AM

nuuuuu

Calvin's Hobbies

I beat ^

quintopia

en.battleship-game.org/id76499960

Anonymous

I beat ^

quintopia

play again!

Anonymous

Nah

Calvin's Hobbies

8:31 AM

Find a game everyone can play at once

Anonymous

I'm actually gonna get some sleep

Anonymous

@Calvin'sHobbies mafia

quintopia

agar.io?

Anonymous

eww no

Anonymous

sellout.io

El'endia Starman

8:32 AM

Okay, what about this idea? Field is much larger, everyone has their ships on the same field, but you only know the positions of your ships and where you successfully hit other ships.

I think that'd be a way to do n-player Battleship.

quintopia

implement it then

El'endia Starman

Nah, you do it. I have a language to finish. :P

CSᵠ

@El'endiaStarman nice

Anonymous

@El'endiaStarman And once your ships are all out, no more shots from you

El'endia Starman

Of course.

quintopia

8:33 AM

even better: RTS battleship, where you can set ships on courses, and change one ship's course each turn before you fire ze missiles

Anonymous

The only issue would be assigning ship positions

quintopia

s/turn/30 secs/

CSᵠ

HA!!

El'endia Starman

Also possible: show hits from other players.

@Mego I think that'd have to be done by the computer.

Anonymous

You can determine where another ship is by the fact that you can't place a ship there

Anonymous

8:34 AM

The controller would have to randomly place the ships

Anonymous

This needs to be a KotH

CSᵠ

@El'endiaStarman king-of-the-hill n-battleship

quintopia

lol

El'endia Starman

Alright, I guess I'll put up a preliminary Sandbox post.

CSᵠ

ships anchored, each can fire in a "cycle"

quintopia

8:36 AM

^

so when you don't have a destroyer, you sit the destroyer turn out

Anonymous

Nah, just make it one shot per player who still has at least one ship alive

Anonymous

KISS

El'endia Starman

yeah

CSᵠ

neah, simple, ships all can fire

quintopia

@Mego anti-KISS: one shot per ship you have

CSᵠ

8:37 AM

but! relative to ship position and relative to ship size

^ realistic

kinda

@quintopia YUP

Anonymous

@quintopia That's dumb and gives a huge disadvantage to players who are losing

quintopia

@Mego not if you can see other players' hits

Anonymous

Players who are ahead will stay ahead, and players who are behind will get further behind

CSᵠ

more can win in a round...

quintopia

since you get extra shots when you hit

Anonymous

8:39 AM

@quintopia How does that negate the disadvantage of not being able to fire as often when you are losing?

quintopia

i just said why

Anonymous

That won't negate it

CSᵠ

put the destroyer idea back in, with SPLASH damage!

Anonymous

KISS

El'endia Starman

^

feersum

8:40 AM

HUG

El'endia Starman

I'm going with the one-shot-per-turn model.

quintopia

fewer ships could be an advantage too: less probability yours gets hit

Anonymous

Hugely Uninteresting Game?

CSᵠ

@Mego DRY

El'endia Starman

@feersum Howard Ulysses Grant!

@CSᵠ SYHTRY

Sometimes you have to repeat yourself.

Anonymous

8:40 AM

@CSᵠ DRY is about programming, not arguing

CSᵠ

@Mego LESS !

quintopia

more is less is more!

El'endia Starman

Okay, should players see other players' successful shots? I kinda like that idea.

Anonymous

@CSᵠ Now you're just typing common words in caps

CSᵠ

@El'endiaStarman that would be carnage

Calvin's Hobbies

8:41 AM

Multiplayer game? My name is plain "Calvin"

El'endia Starman

But LESS is a thing.

quintopia

@El'endiaStarman and should people get extra shots after hits?

Anonymous

@El'endiaStarman Yes, and I'm on the fence about them seeing other misses too

CSᵠ

so is DRY

LESS DRY KISS, more Redundant KISS PLS

El'endia Starman

I don't think misses should be visible. I mean, a hit will have a huge billowing explosion...

CSᵠ

8:43 AM

since it's [koth] you could expose some stuff...

make it realistic, why not

quintopia

huh, apparently no one on PPCG golfs in Flogscript

CSᵠ

maybe see if in your radius ?

back with the radius idea

Anonymous

Calvin's Hobbies

@Mego It was a weird game. I quit. (sorry if the other player was actually from here)

El'endia Starman

I was beating you anyway... :P

It's a graph connectivity game!

I didn't get it at first either, but the second round, I did.

Calvin's Hobbies

8:46 AM

@El'endiaStarman Don't name yourself undefined! :P

El'endia Starman

I tried to pick "elendia"!

Anonymous

@Calvin'sHobbies Mego') DROP TABLE players;--

CSᵠ

@Mego lol remembered this one stackoverflow.com/a/15754118/731947

Calvin's Hobbies

9:11 AM

coderpad.io/GMD6794F

New Sandboxed Posts

0

A: Sandbox for Proposed Challenges

N-Player Battleship king-of-the-hill The Rules The field is a 5N by 5N grid, where N is the number of players. The controller places each player's ships randomly. Each player can see their ships and the shots they have made, successful or not. Each player can also see other players' successfu...

Anonymous

Oops

El'endia Starman

Wow, Mego.

Calvin's Hobbies

umm

El'endia Starman

You made my browser slow!

Anonymous

9:23 AM

<3

El'endia Starman

[sigh]

...this is exactly what I need to learn C#. An easy REPL.

Visual Studio is so big and slow...

Anonymous

^

Anonymous

Mono is nice though

VoteToClose

Mono? o-o

Why would anyone want mono?

El'endia Starman

Dang, their sandbox is good.

Calvin's Hobbies

9:29 AM

Join us @VoteToClose -> coderpad.io/GMD6794F

Anonymous

@El'endiaStarman Hmm?

El'endia Starman

@Mego They've got something that blocks excessive memory/processor usage.

Anonymous

@El'endiaStarman You mean the permutations stuff?

El'endia Starman

And 10**10**10**10.

Your truth machine, on the other hand... =_=

Anonymous

:P

Anonymous

9:32 AM

The permutations stuff is efficient because Python 3

Anonymous

itertools uses generator objects that are lazily evaluated

El'endia Starman

Hence the list(...).

Anonymous

Yeah

feersum

@El'endiaStarman If by the sandbox you mean the universe, then yes, it blocks computation of 10**10**10**10.

El'endia Starman

@feersum I mean this: coderpad.io/GMD6794F

feersum

9:33 AM

@Mego It's the same in Python 2.

Anonymous

@feersum Yeah, but range is also efficient in 3

feersum

What's your point?

I didn't read the link if it's about that.

Anonymous

The link is to a multiuser IDE

quintopia

10:18 AM

compressing an entire program then wrapping it in exec(program.decompress()) isn't a loophole is it?

it's not on the list...

Calvin's Hobbies

@quintopia I'd say no. But it might not help unless the original code is long

VoteToClose

ForEver? Seems legit. — VoteToClose 14 secs ago

quintopia

kk. It saves 9 bytes in this case...\

Anonymous

Worth it

VoteToClose

10:33 AM

@quintopia Make sure to also put the decompressed source code as well so some other golfing tips may arise.

quintopia

yes i did

but i think i've got a bug...

feersum

Regular golfing tips may not always apply.

It can be better to use a function that's one char longer, but has more common letters.

VoteToClose

^ This is true.

Side note: my half box still has 8 stars on the starboard. :D

Okay. That's cool, but enough. xD

VoteToClose

11:05 AM

I'd just like to quickly point out that my top three repped answers are 1) Minecraft 1.8.7, 2) Minecraft 15w43a, 3) a joke/standard loophole.

Anonymous

Anyone here have a Matlab subscription?

Calvin's Hobbies

11:18 AM

@VoteToClose Good lord

The game of life :D

Anonymous

how do run mathematica code

Anonymous

If[#>0,-Zeta[1-#]#,1]&

Anonymous

I have no idea how to use that

Optimizer

can someone link me to the dystro.. chat url?

VoteToClose

Oh hay, game of life!

Calvin's Hobbies

11:21 AM

@Optimizer dystroy.org/miaou/1216 ?

Optimizer

thx

VoteToClose

@Mego By getting a Raspberry Pi or buying a subscription to Mathematica.

Anonymous

@VoteToClose I'm using the Wolfram Notebook thingy

Anonymous

Mathematica syntax is foreign to me

New Meta Posts

1

Q: String input with or without ""?

When challenges require to read a string via STDIN/Console I have seen people interpreting that in mainly two ways. The first one was that you actually just have to type the string as This is an example string. the second way required you to also type some sort of delimiter (usually double " o...

Calvin's Hobbies

11:33 AM

@VoteToClose I don't trust your selection...

VoteToClose

Selection?

Okay, that's cool.

Since the chat removes empty newlines, the half-box trick works infinitely.

Anonymous

inb4 mods ban halfboxes

Calvin's Hobbies

@VoteToClose What do you mean? Perhaps show me in here to avoid spam accusations -> chat.stackexchange.com/rooms/1/sandbox

VoteToClose

Yeah, one sec - writing up a bot to show it.

Anonymous

I finally finished testing all the answers for the Bernoulli question, except the Haskell answer that I am too incompetent to be able to test :/

Anonymous

11:45 AM

I regret everything decision I've ever made that led me to testing all of those programs

Anonymous

On the plus side, I'm the proud owner of several new interpreters

VoteToClose

/me claps.

quintopia

@NewMetaPosts clearly the answer is "if the challenge doesn't specify, either is acceptable"

grc

12:43 PM

@quintopia I thought without quotes was implicit in 'reading from stdin'

do people actually use quotes?

Nathan Merrill

1:15 PM

somebody beat the max player!

CSᵠ

@NathanMerrill phew !

what's a halfbox?

@VoteToClose why a rPi? bundle deal with license?

Martin Büttner

1:30 PM

@NathanMerrill I found another tiling with an 8-cell tile density 1/2:

110
 110
  00

with offsets 2(right)/1(up) and 4(down)

Nathan Merrill

@MartinBüttner I'm trying to tile that, but I'm getting overlaps

Martin Büttner

put the top 11 right underneath the bottom 00

and then shift the entire thing to the two cells to the right and one up

you should get right-up going stairs of Z-tetrominos (of 1s), separated by stairs of 0s.

Nathan Merrill

I believe I found a 3 in a row

let me make sure

Martin Büttner

damn, where?

Nathan Merrill

maybe not

I can do "two-right, one up" really well

but every time I try "two-left, one down", I always mess up

Martin Büttner

1:39 PM

:D

Nathan Merrill

:(

Martin Büttner

something there at the bottom doesn't look quite right

Nathan Merrill

my editor used tabs

Martin Büttner

oh, right

Nathan Merrill

Martin Büttner

1:41 PM

yes, that's what it's supposed to look like

Nathan Merrill

so, it feels very similar to the first (trivial) case we came up with

except its rotated 45 degrees

which is super interesting

Martin Büttner

as a rectangular tile, it's 4x8:

Nathan Merrill

we have 2x2 grids, a line between them, and a line below them

Martin Büttner

unfortunately, all of this isn't really helping at all

I'm pretty sure feersum's conjecture is right, but I have no clue how to go about proving it

Nathan Merrill

2:02 PM

have you tried looking at length 4?

9/16 density :P

Martin Büttner

I did, and came up with an 8/15 tiling, but that's actually inferior to the trivial one.

Nathan Merrill

3/5 density

Martin Büttner

nice :)

I think I've got 5/8

I think this also works:

Nathan Merrill

2:20 PM

is 2/3 possible?

TimmyD

Ooo, what are we tiling?

Martin Büttner

same as last time, but avoiding 4-in-a-row instead

(were you here last time?)

this without 4-in-a-row: math.stackexchange.com/questions/1548710/…

TimmyD

No, I wasn't here last time. /reading

Sherlock9

@Mego Alright then. I edited some more but I'm not sure I can golf it any better at this point

Geobits

> If the user tries to buy an alcoholic beverage, you must demand proof of age. To do so, you ask the user to multiply two random numbers between 13 and 19 (inclusive).

^ This seems like it would not have the intended effect, but the opposite :/

Sherlock9

2:29 PM

@AlexA. I am far more fond of number theory, but that's probably because I've never had to take a quiz on it :P

TimmyD

Ah, so something like
110
010
for density of 1/2 would work. Is that what you're referring to as "the trivial tiling?"

Nathan Merrill

that tiling doesn't work

110
010
110
010

you have an infinite down line

TimmyD

sorry, need to offset it

Nathan Merrill

no, the trivial tiling is this:

TimmyD

Nathan Merrill

2:33 PM

110
110
000

or

Martin Büttner

@TimmyD Nathan posted that earlier (just rotated) I think

wait

his had fewer gaps

23 mins ago, by Nathan Merrill

Nathan Merrill

yeah, mine only had 2 0s between lengths of 3

New Main Posts

2

Q: Advent of Code(golfing) – Day 1

Today, Advent of Code started. Please see adventofcode.com for more details. Here, I would like to see solutions to the first day's problem, for both part 1 and 2. Part 1 Santa is trying to deliver presents in a large apartment building, but he can't find the right floor - the directions he ...

code-golf

TimmyD

Ah, I see. Interesting problem.

Sherlock9

@Mego Yeah Mafia! Town of Salem is browser-based implementation of Mafia

TimmyD

2:46 PM

@NewMainPosts In addition to being off-topic, also very similar to codegolf.stackexchange.com/q/63999/42963

Martin Büttner

the CJam solution for the first part is quite nice: 0q~W* :)

(because ( and ) happen to be increment and decrement in CJam, only the wrong way round, so we just eval the input on 0 and then multiply by -1)

TimmyD

Hehe

Martin Büttner

for the second part, I suppose either 0q{~_}%1#) or 0q'_*~]1#) works

New Main Posts

0

Q: Amount of pieces on a checkers board

Introduction A normal checkers board contains 8 x 8 = 64 squares: You can see that in total, there are 12 white pieces. Black and white always have the same amount of pieces. If there are any more pieces on the board, the pieces would neighbouring, which is not allowed for this challenge. To ...