The Nineteenth Byte

Just had an epiphany. I think the points where gravitational force is the same from two objects do form a circle! It's just that its center is offset!

yeah

did you look at the link?

Circles of Apollonius

The circle of Apollonius is any of several types of circles associated with Apollonius of Perga, a renowned Greek geometer. Most of these circles are found in planar Euclidean geometry, but analogs have been defined on other surfaces; for example, counterparts on the surface of a sphere can be defined through stereographic projection. The main uses of this term are fivefold: Apollonius showed that a circle can be defined as the set of points in a plane that have a specified ratio of distances to two fixed points known as foci. This circle of Apollonius is the basis of the Apollonius pursuit problem...

A and B are the masses

I wasn't sure that we knew the ratio was fixed.

@BlockCoder1392 E is the empty string. I think you can coerce that?

2:06 AM

m1/d1^2 = m2/d2^2

m1 d2^2 = m2 d1^2

No as I am incrementing it.

But I figured it out by doing a mental scaling of the masses from equal to zero and non-zero and thinking about what the shape should be.

Ah, right, yes.

I wonder if C is that stationary point

Yep.

no, just trying to make a counter-like thing

2:07 AM

Sorry, wrong challenge, codegolf.stackexchange.com/questions/68391/please-count-me

?

@El'endiaStarman are you confirming that, or wondering along with me? :P

Now that I think about it, I have no idea how to declare variables in Jolf.

@Maltysen I'm pretty sure you're right.

If forces are equal at every point on the circle...

But now I'm thinking about how to find these points for three or more bodies.

With a numerical approach, that is.

Well, numerical in the sense that I won't have symbolic equations that I solve.

@El'endiaStarman oh right! that makes sense

It's Voronoi, but with a different distance function, so to speak.

2:12 AM

the multiple mass version? ^

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@BlockCoder1392 ~5 is 16 but not a variable

That's fine.

@Maltysen Yeah.

I wonder how to get the traditional equation for a circle from the appolonian one

googling didn't help on that one

Well, the center is halfway between the equilibrium and its antipode...

The radius is half the distance...

2:16 AM

@CᴏɴᴏʀO'Bʀɪᴇɴ how do you declare vars in Jolf? (if possible)

the antipode is where the force vector themselves are equal

Yes.

x = -r/(sqrt(m2/m1) - 1)

yes?

yes

so the radius is (-r/(sqrt(m2/m1) - 1) - r/(sqrt(m2)/sqrt(m1) + 1) )/ 2

cool!

2:19 AM

I think so, yes.

this is really neat stuff

yeah :D

what are you gonna use the multiple point thing for in your game?

It won't be a game, more like a toy.

You'll be able to add and remove gravitational bodies and adjust their masses.

and look at the force field?

2:21 AM

The Voronoi diagram will update in real time.

Yeah.

will the voronoi diagram be for all the points where the forces from all of them are equal?

hmm, no, not exactly

You know what Voronoi diagrams are?

no

ah

Voronoi diagram

In mathematics, a Voronoi diagram is a partitioning of a plane into regions based on distance to points in a specific subset of the plane. That set of points (called seeds, sites, or generators) is specified beforehand, and for each seed there is a corresponding region consisting of all points closer to that seed than to any other. These regions are called Voronoi cells. The Voronoi diagram of a set of points is dual to its Delaunay triangulation. Put simply, it's a diagram created by taking pairs of points that are close together and drawing a line that is equidistant between them and perpendicular...

so your voronoi diagram will be based on force vectors instead of distance?

2:24 AM

basically, yeah

Their magnitudes, that is.

but a thing placed in one region could go into another one's right?

yeah

There are fractals based on that.

Newton fractal

The Newton fractal is a boundary set in the complex plane which is characterized by Newton's method applied to a fixed polynomial . It is the Julia set of the meromorphic function which is given by Newton's method. When there are no attractive cycles (of order greater than 1), it divides the complex plane into regions , each of which is associated with a root of the polynomial, . In this way the Newton fractal is similar to the Mandelbrot set, and like other fractals it exhibits an intricate appearance arising from a simple description. It is relevant to numerical analysis because it shows that...

I saw that before, I don't get how that's related to voronoi diagrams

Well, gravity probably won't exhibit this behavior, but a magnet on a pendulum will (when other, attracting magnets are placed on the table).

@Maltysen If you track which cell the object is in, it might display fractal-like behavior.

But I'm not after that. Just the Voronoi. :P

sounds cool

will you also display the regular force field?

2:27 AM

Yeah.

I'll add a checkbox to turn it on or off.

you should allow line integrals

like I'll sketch a path and you tell me the line integral over the field

....wanna help?

sure!

awesome

You seem pretty excited about this, so... :P

oh I see! the circle we did before is a voronoi diagram cu inside the circle is B's influence, outside is A

but that doesn't make sense

2:30 AM

right

what about point D

or D+1

D is on the border.

D+1 is outside the circle but looks like it should be attracted by B

The influence of A is stronger.

Barely.

is it really?

2:32 AM

Well, the math says so...

Don't mistake the thing falling towards B as being more strongly attracted by B.

wow that's pretty counter intuitive

yeah

Cᴏɴᴏʀ O'Bʀɪᴇɴ

@ՊՓԼՃՐՊՃՈԲՍԼ oVARvalue

But you can go to the extreme to help with the intuition. Think of the Sun and Earth. Now, is Jupiter more strongly attracted by the Sun or the Earth?

oh I see

as you move far enough away, the distance between B and A become negligible

2:34 AM

I'm not sure if that's the right way to think about it.

It's that the force exerted by B falls off more rapidly than the force exerted by A.

@El'endiaStarman why?

That's a regular Voronoi diagram.

z = x^2 + y^2 is a cone.

is there a fast algo for voronoi's of arbitrary metrics

I dunno.

@El'endiaStarman wait how is that a cone?

isnt z=x^2+y^2 a paraboloid?

2:38 AM

Every z-slice is a circle.

oh, my bad

That's z = sqrt(x^2 + y^2).

ah k

And wow, Google has an awesome graphing tool now!

Google it!

its been there for like three years

:P

heh, didn't notice :P

is the code on your website git?

2:56 AM

@El'endiaStarman Liar

lel

@Calvin'sHobbies I said after... :P

@Maltysen Not yet.

How much JavaScript do you know? How about D3.js?

3:18 AM

I know what a JavaScript is.

^

@Calvin'sHobbies Okay, I'm on now, but I don't know if anyone else is.

Nice, refreshing sleep. Nope, no one else is on.

I left 'cause everyone else did.

...[disconnects]

wow

3:23 AM

I've got gravity voronoi to code!

I just watched the new Star Wars movie

did you like it?

Worst movie I've seen this entire year

only movie youve see this entire year?

Yes :P

3:30 AM

lol

@Doorknob冰 It's not that bad. But it sure doesn't follow the comics.

No, I liked it. I mean, it's the best movie I've seen all year. :P

Wow.

hahaha

3:57 AM

@El'endiaStarman I'm kinda curious what the voronoi looks like.

Me too.

IIRC correctly, if there of two stars of unequal masses, there is actually a perfect circle around the smaller one where its force is strongest.

yup

That being the basis of "spheres of influence" in stuff like Kerbal and other games.

Though the center is offset.

Right.

3:58 AM

@ՊՓԼՃՐՊՃՈԲՍԼ Comics?

@Doorknob冰 ._.

Can you not skype call me at 5 in morning ....

Huh?

Oh, are people Skype calling now?

@mınxomaτ Oh sorry

Timezones, dude :D

Yeah, and it's 11pm here, I don't know where everyone is.

Is there a way to call without harassing everyone?

4:03 AM

I dont think so

unfortualety

4

^ spelled completely wrong

> unfortualety

What happens when you get a skype call and you're not at your computer?

My phone rings

okay

List of Star Wars comic books

This is a list of comic books set in the fictional Star Wars universe. Lucasfilm's now-corporate sibling Marvel Comics, which published Star Wars comics from 1977 to 1986, are once again publishing Star Wars titles starting in 2015. Dark Horse Comics owned the license to publish Star Wars comics from Lucasfilm exclusively from 1991 to 2014. The only comics considered canon are those released starting in 2015. For a complete list of Star Wars novels please refer to Star Wars books. This list is incomplete; you can help by expanding it. This list is split into two categories: CANON The new primary...

4:05 AM

oic

oh is a Skype thing happening? I shall join shortly

@Doorknob冰 yeah, as in nobody's saying anything

hahahaha

not surprising

well I am saying stuff to no response.....

Listening to Matthew laugh and distant typing noises.

4:07 AM

@usandfriends got your time capsule character

That's 45

@BlockCoder1392 ^

probably several duplicates by now

@PhiNotPi there are now two characters repeated 5 times

yay it works!

I just hope I wasn't one.

@GamrCorps Your ...keyboard?

4:09 AM

@mınxomaτ no a javascript plugin Im working on

but good guess

@ՊՓԼՃՐՊՃՈԲՍԼ I own somewhere around 115 Star Wars novels. Almost every single one is Legends canon now.

115???

Respect

:P

SPOILERS.

MAJOR SPOILERS!!

wow :(

ಠ_ಠ

4:13 AM

SORRY

What has been seen cannot be unseen.

I forgive you.

Ohhhh, so that's why spoiler (hover to view)

(Ive already seen it)

Same.

But, y'know, others in here might not have...

@Doorknob冰 Indeed.

4:16 AM

@Doorknob冰 Luke's son is named Ben, incidentally. Legends canon though, and it's for the same reason: old Ben.

4:26 AM

@El'endiaStarman I like how I can drag the sun out of the field of view.

haha

If you lose it, that's your fault. :P

Thomas Kwa

4:40 AM

200-point bounty on this question: codegolf.stackexchange.com/questions/67289/…

I'll give a 200-point bounty for any TI-BASIC solution, with no time limit. — Thomas Kwa 1 min ago

4:52 AM

"It'll fix that problem. But it'll cause a lot more." —@GamrCorps

KSFT

can someone help me understand the last test case of this puzzle?

10

Q: Do the Chain Rule

We've had a lot of challenges on differentiation and integration, but none on just solving related rates problems. So in this challenge, you will get a bunch of derivatives (They will be numeric, not in terms of any variables) and have to find another derivative. The input will come in a newline...

if I pretend derivatives are fractions, I can't solve it

A: Sandbox for Proposed Challenges

@quintopia got your time capsule entry

New Sandboxed Posts

5:07 AM

0

Swap the Alphabet In this challenge, you will be "reversing" the alphabet or swapping a-z with z-a [insert absurd reason for short code here] Examples abcdefghijklmnopqrstuvwxyz zyxwvutsrqponmlkjihgfedcba Programming Puzzles & Code Golf Kiltiznnrmt Kfaaovh & Xlwv Tlou Hello, World! Svool,...

code-golf restricted-source

0

Q: Lipogram "quine"

Write a program that does this: Read a char. Output a program that does exactly same with this but without the input char. If your program gets input character a then the output program gets input b then the resulting program is ALLOWED to have a. However, b is still not allowed. Char in here i...

5:21 AM

@Doorknob冰 👍

(╯ ͡° ͜ʖ ͡°）╯︵ ┻━┻

@NewMainPosts As bad as his explanation is, the challenge is ridiculously good as far as quine challenges go. I think it's possible but it is a mindbender.

0

Q: Hotel room numbering

Given an input of a "hotel" in ASCII art with a single room marked, output the room number according to certain rules. Here's an example of an ASCII hotel: ## ## ##### ## ##### ###### ## ##### ###### ## ##### ###### ## Here are a few more things ab...

code-golf ascii-art

2

@NewMainPosts Okay, I think I fixed it.

it's a crotch pig!

5:44 AM

@quintopia It's a what now?

> I don't know why it tells me that I'm the top 92%. How is that encouraging?

Top 92% includes top 1%.

Sherlock9

Confiming Time Capsule

yep, I got it

> I thought you said piss for a second, and I was really confused —on Pyth

6:02 AM

And that's why you pronounce it like the beginning of "Python." :P

scigen.csail.mit.edu/scicache/61/…

We wrote a paper over skype.

> I have lots of friends / I personally find that hard to believe

Zgarb

You could prove a mathematical theorem next: theproofistrivial.com

Sleeping now ->

@Zgarb Next time join us before you sleep :)

theorymine.co.uk

6:18 AM

> Your link requires Flash. I don't have Flash. / That sounds like a personal problem

@PhiNotPi Did you use some sort of automatic paper generator?

maybe

I remember reading about this "scandal" where it was revealed that several journals had published papers that were little more than gibberish, and they were computer-generated.

Gibberish in the sense that none of it was coherent.

@ICanHazHats got your time capsule submission

I Can Haz Hats

awesome

6:44 AM

@Doorknob冰 How many is that now? We may just end with all of printable ascii with some repeats

@Calvin'sHobbies 48

I don't think we're going to get even close to that

Is there a website where you can enter the types and amounts of cooking ingredients you have on hand and it will split back some recipes you can make from them?

google?

lal

How about this chat: What can I make in the casserole family with canned chicken noodle, onions, a small amount of rye bread, flour, sugar, and bacon flavored chocolate?

6:51 AM

@Calvin'sHobbies supercook.com/#/recipes

@PhiNotPi Oooh!

@PhiNotPi Ooooh!

7:06 AM

> Maybe we should just have a no Martin day.

> What are you quoting?

> Skype people

The Skype audio call

I'm now in listening.

> I always rickroll with a purpose. —Alex A.

7:24 AM

Your voices really crushed the mental images I had of you.

That's what I thought the first time I did a Skype call.

Is everyone ready to say goodbye to hats?

I'll keep mine.

just gonna edit it into your avatar?

or was it already there?

I already did. It is the hat-count hat.

7:28 AM

@El'endiaStarman I can javascript

I briefly participated in WB to get the hatcount hat SVG, then opted out.

feels kinda...not in the spirit...to keep it past the holidays

i have no idea what wb means

winterbash...

less memorable than warner bros

yeah, but why would I participate in warner bros...

7:32 AM

I assume this is how you pictured me

@AlexA. You wish

I shall find a working microphone in a few days and entertain yall with horribly broken english.

@mınxomaτ I don't wish that. Look at that guy. It's old, washed-up Glenn Danzig.

@AlexA. I always pictured you like this:

...

why isn't it oneboxing?

7:34 AM

ftfy

also lol

dorothy

8:24 AM

hi all

hi @AlexA.

9:34 AM

I noticed this: codegolf.stackexchange.com/review/suggested-edits It's not empty.

Q: http://newhealthsupplement.com/testo-roar/

9:55 AM

-5

Testo Roar :- Nitric Oxide controls bloodflow in the middle and in this way it can decide lungs the psyche, and other critical zones. This is one of numerous Best Bodybuilding Supplements you'll have the capacity to consider. It works inside the muscles and will help messages are sent by your bod...

popularity-contest

FlagAsSpam

10:29 AM

@CᴏɴᴏʀO'Bʀɪᴇɴ Wat

dorothy

hmm.. how can I attract the pyth and cjamers to codegolf.stackexchange.com/q/68176/21585 ?

or just more people

I was hoping now there are 3 answers people would feel more confident

New Sandboxed Posts

11:03 AM

0

A: Sandbox for Proposed Challenges

War of Flatland king-of-the-hill Oh no. No no no! War has broken out in Flatland. Society has crumbled, and all the women and children are either hiding or dead1. It is total anarchy, kill or be killed. It is such conflict that the 4th dimensional people have erected indestructible borders to p...

11:21 AM

This isn't empty either: codegolf.stackexchange.com/review/reopen

Christian Irwan

I confused, why codegolf.stackexchange.com/questions/68467/lipogram-quine is closed as unclear despite have +6 vote.

I confused, why codegolf.stackexchange.com/… is closed as unclear despite have +6 vote. - An unknown error has occurred - retry / edit / cancel

@ChristianIrwan I'm confused too! It has been clarified twice already (once by the author, once by somebody else, then I did a little formatting fixing). But I don't know at all why it's closed!

Oh look. An error. - An unknown error has occurred - retry / edit / cancel

6

isaacg

11:36 AM

@dorothy I posted an answer in Pyth.

Christian Irwan

I want to see about newhealthsupplement.com/testo-roar challenge.

A: Sandbox for Proposed Challenges

11:51 AM

The review queues are small, but there are loads of unanswered questions. What's up with that? - An unknown error has occurred - retry / edit / cancel

Optimizer

12:23 PM

asdasd

I didn't get any unknown error

isaacg

asjdfasf

asd

fasf

daa

Yeah, it's working fine for me too

Sherlock9

12:51 PM

@ChristianIrwan Your task list is still a little unclear. Your test cases are confusing (you don't need to say language, just input/output). You need to add more detail to that question, because, as I voted, it's still not clear enough yet what this question requires. I'll suggest some things in chat after this, but that was my reasoning

"Output a program in the same language that also obeys this specification, but which does not contain the input character." which specification?

So is it a quine or not? What kind of output do you want?

In the test case that I quote below, which of the lines is the input, which is the output and what is the rest?

> slangi "ABCD"
A
EBCD # "FBCD" "JGGJ" "UGDKJGDJK" are all OK

Are you calling the program, input A, then the output? Because that is not clear at all

New Sandboxed Posts

0

Zipping double quine. code-golf quine You must provide 2 program, A and B. Both are a quine and have same length. If A and B is zipped each other(Both when A is zipped first, or B is zipped first), the result is also an quine. Standard Loopholes is not allowed and standard quine rules apply. ...

Martin Büttner

1:14 PM

@isaacg I feel like you didn't try hard enough for the hotel challenge ;)

undergroundmonorail

1:33 PM

who's hyped for agdq today

@wizzwizz4 o.o

grc

@Sherlock9 "ABCD" is a program that, given input "A", will output some program "EBCD" where "EBCD" is functionally equivalent to "ABCD" but doesn't contain the character "A". So the program "EBCD", when run with another input "C", should output a third equivalent program, and so on.

So it's not really a quine, but each program must output a 'version' of itself without a certain character

@Sherlock9 really i was just going to review the reopen thing

code-golf arithmetic base-conversion binary

0

Q: 1+1 = 10, 1+2 = 3

Write a function or program than can do simple arithmetic (addition, subtraction, multiplication and division) in both base 10 and base 2. The function will take a mathematical expression as input, and output the correct result in the correct base. The input will be n numbers separated by one or...

1:56 PM

@NewMainPosts 1+2 is clearly 11.

books.google.com/…

2109 hours later...