The h Bar - 2016-11-03 (page 3 of 9)

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2:00 AM

@ACuriousMind Regarding the Coriolis force, how is the object accelerating in any way?

@0celo7 Science museums, science fairs, universities (there's one here in the physics institute and there also was one at my hometown), and at least showing time-lapse videos of it is a popular demonstration when talking about the Coriolis effect in school

@ACuriousMind Also how you gonna tell me that a hurricane going quick af is equivalent to the slow ass pendulum

@BernardMeurer Holy fuck I need Python help, stop being a bitch

Each pair of consecutive configurations represents a valid transition, i.e. for $0\leq i<T$, it is the case that $(x_i,q_i,k)i)\xrightarrow{M}(x_i+1,q_i+1,k_i+1)$

@BernardMeurer, okay, got it typed properly

Each pair of consecutive configurations represents a valid transition, i.e. for $0 \leq i < T$, it is the case that $(x_i, q_i, k_i)\xrightarrow{M} (x_{i+1}, q_{i+1}, k_{i+1})$.

@SirCumference In the frame of the rotating observer, it's clearly accelerating because in that frame, $\ddot{x}\neq 0$. I don't understand the question.

2:02 AM

@0celo7 Call. Me.

@BernardMeurer People. Nearby.

user218912

i'm with acm on this, you're being really vague. @SirCumference

@0celo7 So what?

It's weird talking to Brazilian tech support (sorry @ACuriousMind) when people are nearby

@0celo7, you guys could use the chat room to talk...

2:03 AM

@0celo7 Bah, what's your issue then?

@0celo7 The coriolis force is larger the faster an object is moving, so fast-moving things get deflected more strongly.

@BernardMeurer poor parenting

@0celo7 Lol

@ACuriousMind So you're saying that because it holds in a non-inertial reference frame, it counts as a traditional force?

@ACuriousMind I reject this so hard you don't even know.

2:04 AM

so, let's see, that means that for a transition where when $i$ is inbetween 0 and T, right, that makes sense, then the state is mapped to...wait, what does the $\xrightarrow{M}$ even mean?

@SirCumference What on earth is a "traditional force"?

user218912

@SirCumference no?

@heather Read that carefully, and tell me what you don't understand, the previous sentence I said that is

@heather $M$ is our machine

oh yeah, but the arrow?

is that just whatever the machine does?

so It's just showing that it's the action of $M$ on the left triplet generating the right one

2:05 AM

I have never talked about "traditional forces" (or "progressive forces", for that matter ;) ), I'm not sure what the issue is

oh, i got it; it just means that if you have a state, the transformation takes it to the next state. that makes sense!

i.e. consecutive configuration

All right, I'm folding here

@ACuriousMind PAIN

@0celo7 Living in a non-inertial frame is pretty weird, yeah :)

2:05 AM

yeah!

configurations are defined as triplets

I'm not awake enough to have a discussion

@ACuriousMind Curved spacetime was easier to accept than this

Although at some point I must have understood this

I solved the actual issue about the hurricanes and Coriolis Effect, guys. No need to handle the backwash :)

But I can't remember anything

user218912

2:06 AM

@0celo7 tong's notes

@heather Yeah, we're saying that that must always be valid. No two consecutive configurations can exist in such way that $M$ can't generate it

user218912

it's in there

it's in Arnold I bet

@JoshuaLamusga They will fight over it for weeks, this is how this room goes

@BernardMeurer, okay. Yeah, that makes sense. =) Next bit:

If $qT$ = yes (respectively, $qT$ = no) we say that the computation outputs “yes” (respectively, outputs “no”).

2:07 AM

> myList = [1, 2, 3]
for i in range(1, 3):
myList[i - 1] = myList[i]
print(myList)

@0celo7 NO

NO

@BernardMeurer How do I execute this in Python

via the command line

my_list

myList is C++, only use camelCase on Classes!

that's pretty straight forward.

Create a text file

put that code in there

2:08 AM

@BernardMeurer what?

so if q at T is yes, then it outputs yes, and vice versa.

run python thefile.py

@BernardMeurer how do I do that?

Also, name your file whatever.py

@BernardMeurer don't I have to specify a dir?

2:08 AM

@0celo7 Install Atom

Best text editor

:(

@BernardMeurer I have a feeling he's not looking for a lesson on coding standards ;)

If qT = halt then the output of the computation is defined to be the string
obtained by removing . and t from the start and end of xT.

Yes, you can navigate directories with cd

@ACuriousMind he gives me a hard time on my notation all the time, are you taking away my rare chance of revenge?

then yes/no, okay, and then if halt, then the output is x without the start and finish symbols. okay, I think I've got that.

2:09 AM

@BernardMeurer No, I'm getting the popcorn

@heather yep :)

In all three cases, the output of the
computation is denoted by M(x), where x is the input, i.e. the string x0 without the initial . and
final t.

@0celo7 if you run pwd it will tell youwhich dir you are on

then you can cd DIRECTORY to go into another dir

I feel like we've had this discussion before

right, that makes sense too

2:10 AM

How the hell do you people remember things?

@0celo7 We have

Honestly, I can't remember anything

@0celo7 I can remember commands that make people cry blood

If the computation does not halt, then its output is undefined and we write M(x) = up diagonal right arrow

@ocelo7 If you're on Windows then you can drag the file onto the command line to get the directory path

2:10 AM

@JoshuaLamusga Mac

shot down

@BernardMeurer Probably import cryingblood in Python :P

@JoshuaLamusga Fuck Windows

@ACuriousMind Lol, I'll get you a link to a command I wrote, one sec

@JoshuaLamusga (with love)

@BernardMeurer, hey, cd and stuff sounds familiar...huh, okay. anyway, last line, just notation saying output is undefined if it doesn't halt. makes sense.

@BernardMeurer, I FINISHED THE SECOND DEFINITION!!!!!

@BernardMeurer I'm getting mixed messages here

2:11 AM

@heather :D

=D =D

@heather you could have learned calculus in the time it took you to do that.

So should I go back to definition 1 and fill that in?

@heather Yes

@0celo7, first off, that's not true. Second, so what? I learned valuable stuff!

2:12 AM

See if you get it better now

okay

@ACuriousMind gist.github.com/bemeurer/eded4fe8ef2fb88bfa1e08529e2cb6ca

disjoint set?

@0celo7 Look at that, and never complain about cd in front of me again

@ACuriousMind Sigh. I wrote the roots of $x^2-2x+1$ as $-1$ x2.

2:12 AM

@0celo7 Explain what disjoint sets are, no clue how to explain that

I'm so stupid and don't know what to do

@0celo7 WITHOUT BANACH SPACES

@BernardMeurer dear god, what are all those unprintables (?) doing there :P

@BernardMeurer Sets that have no element in common.

@heather ^

2:13 AM

@BernardMeurer, okay, that makes sense

@BernardMeurer What do Banach spaces have to do with anything?

@ACuriousMind Ask the idiot who wrote binfmt, I just do what I have to get Linux on my calculator

We require that for every q ∈ K, if δ(q, .) = (p, σ, d) then σ = . and
d 6=←. In other words, the machine never tries to overwrite the leftmost symbol on its tape nor to move to the left of it.

@heather because it's not doubly infinite

every state in the set of states, then if...ugh, copy and paste, i'll fix that

right

2:15 AM

@BernardMeurer What does import this do in py?

Anyone good with astronomy?

@0celo7 Imagine you could call your prof open his head and read his knowledge

@BernardMeurer what?

If I know the flux incident on a planet and its Bond albedo, can I determine its temperature?

@0celo7 That's an import. You have libraries that contain useful tools. To use them you must import them

i.e. Suppose I want to do plotting

2:17 AM

@SirCumference For the last time. No.

Stop asking.

And someone wrote a beautiful library called ezplotbaby

@0celo7 Astronomy is part of physics.

Hopefully I'd find someone here good at it eventually

user218912

you?

in ezplotbaby you can just do ezplot.function("x^2+3") for example

@obe I'm a learning soul

2:18 AM

since you don't want to be writing all the plotting stuff by yourself

Not an expert

all you do is import the library and use the tools inside it

import ezplotbaby

ezplotbaby.ezplot("x+2")

user218912

@SirCumference ur a fact collecting soul xD

@obe Au contraire, I'm trying to get a formula right now :P

@SirCumference Ugly stepchild maybe :P

2:19 AM

Math understanding soul

Sorta...

@0celo7 What does that make chemistry?

The useful stepchild

2

user218912

chemistry isn't part of physics though (some areas intersect though)

Just post the purity xkcd and stop bickering about fields :P

Chemistry and Biology have saved more lives than all your shitty pure fields

@obe Everything is part of physics

Except math in a lot of cases

user218912

2:20 AM

the only point of math is to further physics tho (and other science)

@ACuriousMind Ok

user image

2

@0celo7 Yeah, nuclear physics has saved so many lives...

It did

I remember the last time nuclear reactions were used to save lives

@0celo7 Did you understand that?

@heather Understood?

@BernardMeurer I understand programming as much as you understand analysis.

2:22 AM

I told you it took me a week to read through this lol

@0celo7 It's taken more lives than astronomy ever could :P

@0celo7 You're doomed

user218912

@SirCumference depends if you're a nihilist

@BernardMeurer, the gist, yes, the specific notation, no

@obe Tell that to the mathematicians, I'll visit you in the hospital :P

2:22 AM

@0celo7 Just you wait, when space exploration is necessary for our species, you'll see

user218912

@ACuriousMind :O

@heather Let it sink in, it's a lot of notation

@SirCumference inb4 hubble falls into manhattan and there's a chain reaction that kills everyone in the tri-state area

@heather Read section 2, the examples help A LOT

@0celo7 Manhattan?

2:23 AM

@SirCumference New York?

so for every state, if the delta thingy on the state and the beginning position is the...right...okay, I think I've got that now.

@0celo7 ...

:)

In seriousness, a gamma ray burst has yet to wipe out humanity

So astronomy is still a score above nuclear physics

Okay:

SECTION 1 IS FINISHED!!!

now, page 3 =P

2:25 AM

@0celo7 Oh no...

You're one of them

CHAT ARROWS WORK ON MY PHONE

@ACuriousMind HOLY CRAP CHAT ARROWS WORK ON MY PHONE

@SirCumference, nuclear fusion might save humanity, so please desist with continuing the whole nuclear = death misconception.

@heather To your credit, the fusion in the Sun is currently saving humanity...

But that's also astronomy

@heather Nuclear is pretty deadly

And I wouldn't mind working on weapons

Why do you think I'm trying to find where @SirCumference is

@0celo7, nuclear is not deadly, humans are

and whoa, that just got weird fast

2:27 AM

@0celo7 At times like these I'm glad you know nothing about me

@SirCumference, yeah, but fusion is more physics, and I mean, the end of the universe is completely in the realm of astronomy

@heather That's cosmology

user218912

user image

@SirCumference, technicalities =P

@obe No "Ask me again later" option?

2:28 AM

@obe, =D lol

@heather Au contraire, fusion is certainly an important part of astronomy

user218912

@ACuriousMind xD

That's 80% of stellar physics

@SirCumference, I'm not saying it isn't, I'm just saying it is mainly physics.

@heather Astronomy is a branch of physics

2:29 AM

@obe The answer to that is always no

@SirCumference, ah, but then we have no argument, and that's no fun =P

vignette2.wikia.nocookie.net/fallout/images/5/55/…

Anyone like it?

@0celo7 wtf

@0celo7, wait, so you wanted me to prove what?

something about epsilon...

Thougt I posted porn for a second there

2:29 AM

and 0

don't scare me like that

@0celo7 You have weird interests....

Lately, watching this chat in the late hours makes me feel like this gif:

user image

@heather I have that paper on turing machines printed. It lives by my bedside.

@ACuriousMind, I love Escher drawings!

2:30 AM

@ACuriousMind It always gets worse.

Oh stop with the fucking starring

@BernardMeurer, I will continue reading it.

@heather someone starred it.

@ACuriousMind Hey, can you edit my starred message to be correct.

$\epsilon>0$ of course.

@0celo7, it's not on my starred thing anymore, one moment

oh, nevermind, got it

@0celo7 Not on mine

nvm

just got it

Wifi sucks

@ACuriousMind mod abuse? please?

thanks

2:32 AM

Thy wish is granted

Othello, I have a question for you

okay, so if $|x| \neq 0$, then $|x| > 0$

@SirCumference you'd better not troll me

user218912

where is @Obliv

@0celo7 If you're into applied physics, why deal with things like GR?

2:33 AM

if this is true, and $|x|<\epsilon$ and $\epsilon>0$

@SirCumference I don't

I gave up that life

threw out the GR books

@0celo7 Who are you

(well, donated them to the library)

And what have you done with Othello?

user218912

he's into math right now. well one of the 0celo7's are.

2:33 AM

Mar 21 at 2:17, by 0celo7

GR is holy

@0celo7, whoa, whoa, what, no, this...where...what...*(::pure shock::)*

user218912

or a few of them at least

Mar 23 at 23:03, by ACuriousMind

May 7 '15 at 3:16, by 0celo7

(GR is cooler!)

@0celo7, please explain the madness!

no, you can do the proof yourself

2:34 AM

@0celo7, no, not the proof, the absence of GR!!!

@ACuriousMind Does Steam tell you I'm playing F4?

that is madness!

@0celo7 Yes.

@heather there is nothing to explain

you ask a stupid question, you get a troll answer

@othello All right, legit question, how do you plan to make use of Riemannian geometry?

2:36 AM

@0celo7, okay, you were not being serious.

thank goodness

@0celo7 What was stupid about that?

for a second I thought you were serious and my brain nearly short-circuited =P

@ACuriousMind at least one of us thinks I'm playing F4.

My computer froze

I swear I didn't mod it :P

user218912

how do you tell if a girl does not like you?

Try to kiss her, see if she calls the cops

2:38 AM

^bad idea

Othello, 'twas a serious question. Why learn GR?

You said you liked applied physics

Why play video games?

@SirCumference, GR is wonderful in all its ways...

It's something I enjoy

@0celo7 I don't know

I don't play them

user218912

2:39 AM

@0celo7 a real way to find out.

@SirCumference, you live a sad life

@heather Nah, I played them for 16 years

@obe, from what I know, which is very little, you ask whomever "out"

Beating levels started to feel kinda empty after that point tho

@SirCumference, levels, no, no, you want minecraft

user218912

2:40 AM

@heather :o

user218912

that's too risky

@BernardMeurer, do you play minecraft?

@heather Minecraft tore my middle school apart

Kids were attacking each other irl for stealing their items in the game

@SirCumference, that's stupid and a misuse of minecraft

@heather That's like the #1 game people take too seriously

2:41 AM

@heather It's been a while, but I played it quite a lot. Very nice game, a shame it was written in java

@obe who is she

@BernardMeurer Just wait, the sequel will be in JS

Then the final game will be in HQ9+

@BernardMeurer lol

@BernardMeurer, I was asking, because people have built computers in it using redstone...

@SirCumference Fuck that man, you like the shittiest languages

2:43 AM

@BernardMeurer HQ9+ is the best language

It's the highest quality language you'll find

@heather A, yes, I've seen those computational models, very neat

@SirCumference The name tells me it's stupid

user218912

@0celo7 how do you want me to answer that?

@ACuriousMind Did you expect me to lose a chance to complain :P

@BernardMeurer Dude

HQ9+ is a joke programming language. It has four "operations": H: print "Hello, world!" Q: print the program's source code (sometimes called a quine) 9: print the lyrics to 99 Bottles of Beer +: add one to the accumulator (the value of the accumulator cannot be accessed) == Other websites == HQ9+ home page HQ9+ on Esolang, the esoteric programming languages wiki HQ9+ as an embedded language in Haskell Online HQ9+ interpreter in JavaScript Online HQ9+ interpreter realized with PHP HQ9+ interpreter in C HQ9+ interpreter in Pascal hq9plus - HQ9P implementation for Parrot...

@SirCumference I think that's only what you say after the 99 bottles of beer are empty :P

2:44 AM

It's a popular joke among programming nerds

dailymail.co.uk/tvshowbiz/article-2880044/…

Y'all seen this?

user image

That's what Stack Overflow has devolved into

@SirCumference -1, not enough jQuery

2

@BernardMeurer huh? dont like java? its tightly coupled with minecrafts very successful plugin architecture etc...

@SirCumference lol

Fuck JQuery

@vzn Fuck Java

2:45 AM

@BernardMeurer Woah...

:)

Love y'all

My favorite programming joke is

@BernardMeurer ouch, so what do you prefer? BASIC? :P

["hip", "hip"]

(hip hip, array!)

@vzn Also, nice seeing you, it's been a while :)

@vzn C, Python, recently looking at Rust and finding it funny

2:46 AM

@BernardMeurer yeah nice to see ya too have been busy mostly wrt work & nobody cares about special guests anymore anyway lol

@0celo7 You still think programming is useless?

@SirCumference In which language is that an array?

@BernardMeurer JS?

@SirCumference no

I never thought it was useless

@SirCumference, that bothers me like you wouldn't believe (the -2 on the only real answer)

2:48 AM

I just think it's boring af

@SirCumference Ah, [] means list to me nowadays

@heather It's a joke image, don't worry

It's all fake

Just was really funny

{} means C which mean array

Fuck JS

it's an evil language

@BernardMeurer Uh what

Python! Always Python!

2:49 AM

The internet should be made in FORTRAN

@heather Note the missing numbers in front of the related questions, and the absence of an asker

@BernardMeurer You're telling me this thanks to jQuery...

It's not real

0celo7s new nickname "boring af" :P

This chat runs on JS, contrary to the belief of @0celo7

2:50 AM

@ACuriousMind, hmm, yeah =)

user image

This is what I think we should do

Aug 6 at 20:47, by 0celo7

I don't have JavaScript

all these web languages should go serve some hipster dude who can't read a kernel panic somewhere else

@BernardMeurer Oh, sure, like C++ will ever be useful

At least JS is important in some way

@SirCumference You make it too obvious, you need t bait better

2:51 AM

99.9% of sites need it

@SirCumference, whoa, whoa, C++ is much better than JS, are you kidding! Yeah, JS is okay but C++ is better, and Python is best of all.

@obe is she a student?

@heather Python's good but C++ is darn near useless

@SirCumference That's not a feature, it's a bug

@BernardMeurer I haven't actually used the modern Fortrans, but string processing in the old Fortran was even nastier than doing it in c, which is saying something.

2:52 AM

@Bernard saw your TM tutorial back in the chat transcript, nice job man

user218912

@0celo7 yes

Look if people are making plugins to block your language from running there's something wrong with it

Sex starved 39 yo Slovenian?

user218912

what?

@vzn, hello

user218912

2:53 AM

lol

Speaking of computer science

133

Q: Super Mario Galaxy problem

Suppose Mario is walking on the surface of a planet. If he starts walking from a known location, in a fixed direction, for a predetermined distance, how quickly can we determine where he will stop? More formally, suppose we are given a convex polytope $P$ in 3-space, a starting point $s$ on t...

ds.algorithms cg.comp-geom

@0celo7 That was Bernhard, you're mixing them up :P

@dmckee I have one word for you and you will feel my pain. VHDL

This finally got an answer

@SirCumference, you're kidding!

2:54 AM

@heather No, check it out

@BernardMeurer Sorry. I have a brain hack that blocked me from loading that word.

I gave it a bounty

@SirCumference, cool!

@dmckee LOL

@dmckee Exactly

I'm reading through the second section of the Turing Machines paper

2:54 AM

@heather hey there saw you working with TMs not on the Computer Science site, youve been cheating on us :(

@vzn, sorry!

there was no one over in the CS chat at the beginning

@0celo7 Mind reading.

...what the fuck

@heather ps check out that dailymail link to find out what can be accomplished with coding, wink

@vzn, yeah, I already skimmed it =)

geesh

2:56 AM

Fallout 4 loading times are LONG AF

@heather Wanna see something better?

@obe major?

user image

@heather its like that usher song theyre playing on the radio... "when you roll with me girl, theres no limit" :P (sticking in pop music ref to bait 0celo7 here)

@SirCumference, what...where is that? If that is on physics, that is scary.

2:57 AM

@heather Astro

user218912

@0celo7 undeclared science. why?

@SirCumference, still scary

What class do you have with her?

@vzn Shoo, she's my CS pupil

@heather It's fake

But hilarious

2:57 AM

@SirCumference ::hides dark matter axe behind back:: That's a stupid question!

2

@SirCumference, thanks goodness its fake =) I thought it didn't look quite right

@heather we will react if you write, but admittedly its no good for instant gratification... have been trying to build it up for years, no dice yet... so wrt this we all have Physics envy :(

user218912

@0celo7 none :(

Before this good question was removed:

@ACuriousMind Nothing prevents you from hiding in your own chest. No harm will come to you. Which is sorta the problem...

2:58 AM

user image

user218912

@0celo7 known from hs

On physics

@vzn, I still come over and look around every now and then. Oh, check this out

@heather wow not bad, impressive! who is running that?

@SirCumference, that one isn't real, is it?

2:59 AM

@dmckee Heh, I guess you're right

@heather It actually is

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Nov '163

The h Bar

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