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14:01
I really want to pose a challenge to compute the Riemann theta function in the special case that z = 0 :)
@Lembik He llo!
hi @zyabin101
hey mathy people: is there a name for the Longest increasing subsequence that isn't continuous?
@Lembik ^
@NathanMerrill it is the Longest increasing subsequence
@NathanMerrill Can you give an example of what you mean?
14:11
Continuous?
@Dennis what's your avatar from?
it certainly rings an (old) bell.
Dennis the Menace
oh, for some reason, I thought it had to be continuous
my bad :)
whoops, seems like I forgot to update my username.
@NathanMerrill that's substring
@Dennis Dennis the Menace rocks :)
14:12
:)
5.5/10 rating on imdb, booooh
but where is gnasher??
@Fatalize that's not the comic :)
if a user has been in chat, but his name doesn't popup when I use the @ symbol, is he pingable?
It is the longest running comic in the world I believe
14:14
@NathanMerrill You can reply to his message
en.wikipedia.org/wiki/The_Beano Maybe there is an older one somewhere
but if so.. I would like to know what it is !
grmpf, me username.
@NathanMerrill Fun Mathematica fact: LongestCommonSequence, LongestCommonSubsequence. Guess which does what.
(Mathematica uses some nonstandard terminology sometimes I swear...)
@Sp3000 oh that's broken :)
According to my control panel, my build server has 0% CPU usage and **-**95% RAM usage. No wonder everything fails...
14:18
@user1737909 That's caching. Just a sec, I'll refresh it for you.
hey, is there some way I can see moderation activities of a user without them posting on the election?
@mınxomaτ Build server?
(or parsing the long list on their profile)?
ven
ven
well, hi. new skin. new avatar at the same time.
@NathanMerrill I don't think you can see review activities, no.
14:18
Welcome, @ven!
ven
ven
;)
@quartata you can on their profile activity page
@zyabin101 A server that builds and tests code automatically across different operating systems.
@GamrCorps Oh, oops.
14:20
Wow, 9 candidates.
oooh, how did I miss that tab
I was kinda hoping we wouldn't have to do a primary
That ship has sailed.
Trump standing?
well, not naming names, but I definitely feel like we need at least 1 replacement :)
14:22
sorry.. someone said primary :)
@Lembik 680
@PeterTaylor Hey, you're still here on the site, but not on chat :( Anyways, do you have plans on nominating yourself?
@NathanMerrill He was nominated in past elections and declined
I know, but there's always hoping
@quartata what is 680?
14:25
@Lembik delegates
@quartata so far for trump?
Yes.
@NathanMerrill Do you have any plans of nominating yourself?
@quartata I think it's 695
14:26
@NathanMerrill same
I would mind it, but I haven't been here long enough.
have you seen my activity on the site?
Mine is worse.
Maybe 4 answers in 8 weeks?
are there any Trump based code challenges?
Too many.
14:27
Yes, but I strongly discourage you from making one.
I think only 1, but ^.
There are like 4.
which is the best? :)
NO MOAR TRUMP
14:27
@Lembik None of them.
ven
ven
you can't trump the best one ;)
42
Q: Help Trump build the wall!

J AtkinTrump needs the wall constructed and you are going to do it! To most efficiently build his wall I have created a simple, repeatable pattern for you to use: __ __ | |_| | ___| |___ - - - - - - - - - - - - - - - - - - - ——————————————— Trump will tell you how ma...

I just found that!
@EasterlyIrk I've got 3 answers in 2 years
14:28
rofl
@EasterlyIrk Only 1 and too many aren't mutually exclusive.
4
You have moar questions though.
which looks a lot like a wall to me
so I am confused.. as ever
@Dennis I actually meant that as a caret to your message, but @quartata worked just as well.
@Lembik are you in the US?
@EasterlyIrk no!
14:29
okai
I was just wondering as a matter of fact if a big fence is already being built
which would make the Trump wall thing less interesting
Not really.
Ok, I'm going to make the free rice discussion room. Who will participate?
sure
idc
idk
@Lembik 3 moar examples.
@EasterlyIrk thanks :)
14:31
funny enough, not counting the sandbox, I've got 7 times the amount of answers on meta than on the actual site
but really I feel that Trump's face calls out for an image processing challenge
I don't, but okai....
ven
ven
Challenge title: "orange is the new black". You must replace obama's face in an image with trump's.
or something.
@ven :) Let's try to avoid anything close to racials questions on PPCG
Mockery is good in general though
ven
ven
'twas but a play on word on the show named "orange is the new black". but fair enough
14:37
We could make an image of Trump's face out of famous Mexicans.. (umm.. maybe not :) )
@ven I got it
Personally, I think it's ideal if we just keep politics out of PPCG challenges
@Quill Good.
but that's just me
14:38
@KevinW. I agree.. the question is if we can be silly without being political
Keep political opinion out of PPCG challenges
I already agreed :)
there's no reason not to have politics, as long as people don't express their opinions on the post
@Lembik To be fair, that wall question that was linked is definitely good at keeping it silly without injecting any political opinion at all
well.. some people have a very strong political opinion about perl!
tricky if someone is from the "keep it serious" party :)
as a non-US person, I forget that some real people actually support him
foreigners can't quite believe that :)
14:40
I am american, IKR?
IKR?
I know, right?
I can't translate that... are you agreeing with something I wrote?
sorry...
yeah, he's agreeing with you
saying that "even americans can't believe he has supporters"
@Lembik yes.
and ^^
14:42
ah.. thanks :)
@Quill thanks!
no problem :)
TIL there is a badge for getting your chat messages starred.
but there are lots of the supporters! Where are they hiding?
Everywhere.
brb finding a politics SE post
but not in PPCG chat?
14:43
43
Q: Why is Trump winning, when I know so few people who admit to voting for him?

PearsonArtPhotoI am a well educated Republican, of generally conservative views. Pretty much every day I see and hear people talk about how poor of a candidate Donald Trump is. But he's winning primary after primary, and is likely to win tomorrow in my home state. Every other election I've known plenty of peopl...

good link!!
I found it on the HQ list on the right of any question.
nice
Only people that like JavaScript support Trump. There, I said it.
3
as a foreigner I guess I just never come across the non-college-educated-but-conservative segment of the US population
@TimmyD Perl people?
14:45
@TimmyD I like the first but not the latter.
how do they vote?
@TimmyD ಠ_ಠ
IDk
I am not one.
@TimmyD ಠ__________________________ಠ
Hey, somebody unstar that.
@Fatalize ಠ__________________________ಠ
ಠ__________________________ಠ ALL AROUND
14:46
:D
I feel sorry for perl programmers
We should build a wall around Javascript I say
@Lembik Head to the south. There are tons of "not-college-educated conservatives" here :/
@Fatalize ಠ__________________________ಠ
ven
ven
@Lembik we're very fine :)
14:47
there are lots of them, but like Trump supporters, we never talk to them
@TimmyD ಠ__________________________ಠ
@ven :)
ಠ__________________________ಠ to all, and to all a good slap in the face. ಠ__________________________ಠ
People who hate JavaScript are just scared because they know JavaScript is the future.
1 min ago, by Easterly Irk
Hey, somebody unstar that.
14:48
There, I said it
@Quill amen.
@Quill :)
@EasterlyIrk ಠ__________________________ಠ
what's with the ಠ__________________________ಠ ??
14:48
Disapproval.
What's with all the long noses?
JavaScript is the future? We're doomed...
@Quill Even if that were the case, I'd prefer a better future.
4
@Dennis Pinnochio was preaching.
It's like watching Idiocracy. I could see it happening, but I don't want it to.
14:49
@Geobits I'd rather it didn't have "Java" in the name
that's the only reservation I have
@EasterlyIrk How did you do it?
a lot of pixie magic and avodadas
@zyabin101 Not me.
That was in the FOG discussion room.
in FOG Discussion, 5 mins ago, by Easterly Irk
@ZachGates No campaigning in here.
What is going on in here
Did he build it into the userscript?
14:51
@Geobits ther are plenty of smart conservitives though
@quartata majik and trump
like me
and no avocad. :(
@Quill brb, making new language TrumpScript
@TimmyD Already exists
@epicTCK I'm not saying there aren't. He said he hadn't met any without education, and it's true that many southerners would fit that description.
already made
double ninja'd
Wow
14:52
@Geobits yes i do agree
but sadly, not enough...
More than enough, I'd say ;)
"All numbers must be strictly greater than 1 million. The small stuff is inconsequential to us."
"A small loan of $1,000,000"
Trump has much more than that.
We should take it and donate in to the avocad juic foundation.
@Fatalize Life has not been easy for me
Make avocados great again
3
14:54
I started off in the Nineteenth Byte
Alex gave me a small loan of a million stars
8
roflmao
@quartata The One Millionth Byte
@TimmyD One Million and 16th byte
Eww, juicing the pits?
"Pit juice" doesn't sound very appetizing.
14:56
The 1245184th Byte (19 bit-shift-left 16 places)
I will delay my Riemann Theta challenge questions until the math people want to talk :)
Everyone decided against the free rice discussion room. Uh, whatever. :shrug:
@Lembik I am math, but not sure if I am people.
@Geobits I bet you don't eat orange peels, either.
15:03
No, but I've used them in recipes for sauces and such.
@zyabin101 Not saying yes isn't necessarily saying no
Two random people wut?
Candied orange peel is delicious.
@orlp hi :)
@orlp so.. this has interested me recently.
Given a real symmetric matrix M, compute sum_{x \in Z^n} e^{-x^T M x}
or at least a good approximation to it
15:07
@Lembik what is T?
always try to peel it off in one peice
@orlp sorry.. it just means transpose
@orlp is a vector of length n whose elements are from the integers
@Lembik I'm confused
if x is a vector, then transposing it will give an nx1 matrix, no?
@orlp x^T is 1xn. Consider it in parts. First Mx which is an n x 1 . Now we multiply 1xn by nx1 to get a single number
@orlp to me, vectors are by default column vectors
15:12
@Lembik ahh of course right-to-left
@Lembik but no, x^T is n x 1 because mathematics is stupid and decided to use height x width instead of width x height
ven
ven
what are people here up to?
if I can share some of my fun:
(lldb) p &mutex_
(pthread_mutex_t *) $1 = 0x0000000000000030
@orlp well..... we need to multiply two vectors in the end to get a number. so the first one has to be 1xn and the second has to be n x1.
@ven Commissioning 10 new Exchange servers.
@Lembik or vice versa :)
@TimmyD "fun"
15:15
vice versa you would end up with a matrix
not a number
oh
right
well, isn't the formula wrong then?
so this is a tricky sum to do by computer as it has an infinite number of terms
let's say x = [1, 5, 2, 19]
@quartata I enjoy it, and I get paid to do it. What else can anyone ask for?
then x^T = [1
                   5
                   2
                   19]
15:16
hey, is it theoretically possible to take a linux distro and modify it so that it is on top of a different kernel?
@orlp no... vectors start as columns in math
would programs built for that distro still work?
@Lembik zzzzzzz of course
@NathanMerrill compiling a different kernel is a common task
@NathanMerrill assuming you're talking about different versions/flags of a linux kernel
Are you wanting to take, e.g., Debian, and make it run on FreeBSD?
@orlp zzzzzzz ?
15:18
@Lembik it means I'm being stupid :)
@orlp so there are two options.. either just add up the terms for vectors with small integer coefficients and hope you are close
no, I'm saying to change the linux kernel for a different (not linux) one
@NathanMerrill oh yeah that'll probably mess up everything
I'm sure it's possible -- that's kinda the point of an open source -- but it'd be difficult.
@Lembik but for what kind of matrices are you studying this? e.g. for [[0]] it's divergent
15:20
sure, it'd be difficult, and you'd change a whole lot of the distro
@orlp or implement something clever like math.fsu.edu/%7Ehoeij/RiemannTheta/RiemannTheta
but its theoretically possible for the distro to act/look the same on a different kernel
@orlp real symmetric ones with determinant > 0
But if you mean something like recompiling it for ARM instead of x86 or something, that's not terribly out of the ordinary.
@TimmyD You enjoy setting up Exchange servers?
I was under the impression that it was pretty nasty
15:22
Some people like coding in js, and I hear that's pretty nasty.
@quartata I've been doing it for the past 10 years, so I'm getting pretty used to Microsoft's quirks.
@TimmyD yeah, that's not what I'm talking about :P
ven
ven
@orlp i know your nick from somewhere, but not sure where...
@NathanMerrill I'm sure there's some group of crazy dedicated people who have ported SuSE to OpenBSD.
@orlp is it more or less clear now?
@orlp the sum I am referring to is a special case of the Riemann Theta function
15:26
@Lembik well, I know that for M=[[1]] the answer is 1 + ϑ₃(0, 1/e)
using wolfram alpha :P
so yeah, something to do with jacobi theta functions
@orlp in math notation I am talking about calculating theta(0|iM/pi) that is the complex vector z in the Maple source I gave is 0 which makes things slightly easier.
but I'm really not familiar with real/complex analysis, so probably not much help
@orlp it is exactly the multidimensional jacobi theta function
@orlp well.. I am talking about the real case only :)
15:28
@ven why?
it's just the sum of real values
ven
ven
@orlp because if you continue, next iteration will try to use rootkey again
@orlp it just so happens there is a more general function that also handles complex values and covers this as a special case
@ven good call
ven
ven
:D random stalking bugfinding!
I even hesitated to just send a PR...
15:29
@orlp so... too much for a code-challenge?
it's definitely hard :)
@Lembik I wouldn't even know where to begin, this is well out of my expertise
@Lembik here's how to know if I'm interested/can help
step 1. is it discrete?
step 2. read step 1
@orlp well one can begin by just summing over vectors with integer values
@orlp the vectors are discrete :)
the only part that isn't is e^ :)
@Lembik I wouldn't really call power series discrete :P
I could add some python code to do the naive approach
@orlp it's not a power series is it?
@Lembik it's an infinite sum of powers
how is it not?
oh wait
it's probably more restricted then that
15:31
yes I think so
yeah sorry
either way it's still an infinite sum of powers of e :P
@Lembik you can make it discrete by dropping the entire e^ part
just define a counting order over Z^n
if only PPCG had 10^8 users.. then at least one would be interested
@orlp go on....
e.g. [0, 0], [0, 1], [0, -1], [1, 0], [-1, 0], etc
15:34
ok.. then what?
then -x^T M x forms an infinite series of integers
you could make a codegolf that outputs that series of integers for a given M
ah..code-golf :)
I try to steer away from code-golf.. I feel there are enough people posing those questions already
What do you compete in then?
ohai @orlp
:28433977 ?
15:54
I'm currently in a "puzzle hunt" competition hosted by my university.
It's pretty... insane.
ven
ven
which reminds me, the APL programming contest starts soon™-ish.
16:12
That feeling when you spot a 10k+ user you've never seen before.
Say you can to convert from base 16 to 7. These are just examples, assume arbitrary bases. Do you know of a simple algorithm to do that without converting into a temporary (decimal) integer?

In Matlab, `x = '3E4A'; t = base2dec(x, 16); y = dec2base(t, 7)` works, but the intermediate step limits the number `t` to the maximum allowed integer size (actuallty a little less). I'd like to do it without that intermediate step, so that it works for an arbitrary number of digits of `x`.
Any ideas?
@Dennis Who?
Madrid, Spain. Interesting
@Geobits looks so weird without the icon...
16:25
Geobits looks weird without the hat! :P
@DonMuesli you can divide the base 16 number by 7 repeatedly and keep track of the remainder, but most languages don't have built-in arbitrary base division afaik, so you'd still have to convert to base 10, unless you wrote it yourself
@EasterlyIrk :/
I think the hat is super stylish.
Meh. I don't really like it much in the avatar or in person. An impulse buy that just didn't work out.
16:43
@FryAmTheEggman Does that work if I have the base-16-number digits (not the actual number in base 10)?
hey there @doorknob
@DonMuesli Yeah, you just probably need to write the arbitrary base division code yourself.
@DonMuesli You'd have to implement long division (digit array by a base).
ninja'd
@Dennis That's exactly what I wanted to avoid :-( Sounds boring
16:47
can I specify a maximum Big-O for a code-golf challenge?
or is that too broad
0
Q: Solve the Secretary Problem

Nathan MerrillThe Secretary Problem is a famous problem described as thus: You need a new secretary You have N applicants that you can interview one at a time You are able to score each applicant after the interview. Your scoring system will never give two applicants the same score After you interview an ap...

IMO those types of challenges aren't terribly interesting.
its simply to enforce reasonable runtimes
its not the core of the problem :)
16:51
I usually stay away from them because I don't know how to measure complexity.
I think if the restriction is used well it can be good, many of Martin's questions for example have a time restriction (which is basically the same) so that the boring "try everything" solution doesn't work.
that problem is reasonable isn't it?
it's just dynamic programming IIRC
@Dennis measuring complexity is not so hard.. run it on some inputs of increasing length and see if you get a straight line :)
or ask someone else :)

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