raptop changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<bofh> 23:44:38 <@egg|zzz|egg> hm i guess it's 1 because I'm only modeling the mean, and the number of frequencies I pick is how I estimate τ^2, not a different basis
<bofh> 1, yes.
<bofh> 23:49:18 <@egg|zzz|egg> bofh: if I'm only computing one coefficient of the dft, isn't it easier to do so naively from the definition? I don't see what I gain from the fft algorithms there
<bofh> okay, I guess that is a good point.
<egg|zzz|egg> bofh: also: is this estimator (2nd coeff of the appropriately normalized fourier transform, squared, divided by N) general porpoise in theory? what assumptions break it
<bofh> like, give me a moment to think about that. it *should* be general porpoise under some assumptions, I'm just not sure which. I might actually ask a friend that's a proper statistician since I *know* I've seen this before but I can't for the life of me recall where or in what conteggst.
<egg|zzz|egg> bofh: how do you have statistician friends and why are they not here,
<mlbaker> do i even want to know what is going on hee
<mlbaker> here
<egg|zzz|egg> mlbaker: i have no idea what I'm doing, and I'm trying to estimate the uncertainty of the mean of a time series that clearly has a signal in it (but I don't give a damn about the signal, I just want to estimate the mean)
<egg|zzz|egg> mlbaker: the purpose of the uncertainty is to limit the number of sigdec shown in a KSP mod :-p
<egg|zzz|egg> mlbaker: time series may look like https://i.imgur.com/SAgBNRi.png for instance
<egg|zzz|egg> mlbaker: however, i can neither into statistics nor fourier analysis
<mlbaker> i'm confused
<mlbaker> you have a time series
<mlbaker> so you can compute the mean
<egg|zzz|egg> yes
<egg|zzz|egg> I want to estimate the error of the mean of this finite time series as an estimate of the mean of the actual infinite time series
<mlbaker> okay
<mlbaker> what's the infinite time series
<egg|zzz|egg> here we're looking at the anomalistic period of a slightly perturbed orbit, computed as the times between periapsides over 4000ish orbits
<egg|zzz|egg> what is it? probably a bunch of periodic things with mystery periods from third-body effects, kozai oscillation, the precessions, etc.
<mlbaker> 17:50 <@egg|zzz|egg> bofh: but then there's a part II to that paper, where he does basically the same paper but in---galaxy brain---tensor index notation
<mlbaker> (A wild ROGER PENROSE appears!)
<egg|zzz|egg> mlbaker: sadly there is no part III with the same paper again with squiggles
<mlbaker> yeah
<mlbaker> or as the french call it "notation des insectes"
<mlbaker> i read the backlog a bit, still don't feel like i really understand the problem
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<egg|zzz|egg> I can compute an approximation of the anomalistic period by taking the average of the periapsis-to-periapsis times over N orbits, but I would like error bars on that approximation of the anomalistic period
<mlbaker> i think you need information about how the data is distributed to say anything
<mlbaker> seems to me like you're roughly asking how quickly a finite mean converges to the true mean
<egg|zzz|egg> well, importantly the data is very autocorrelated (it's pretty much a periodic signal!) https://i.imgur.com/SAgBNRi.png so this leads to the estimators for the variance of the mean based on serial covariances
<egg|zzz|egg> which can in turn be approximated under some conditions by the low-frequency Fourier speggtrum
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<kmath> <PlanetTreky> "Potentially the first evidence of a terrestrial meteorite." ⏎ !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! https://t.co/YNOIVKdGmu
<bofh> UmbralRaptor: ?
<bofh> Don't we have a lot of terrestrial meteorites?
<bofh> Or do you mean terrestrial *in origin*?
<UmbralRaptor> bofh: the latter
<bofh> what the hell how does that work.
<UmbralRaptor> Well, it was found on the lunar surface…
<UmbralRaptor> (Same way Lunar, Vestan, and Martian meteorites work. Something whacked earth hard and knocked a few chunks off.)
<SilverFox> prolly the dinosaurs
<UmbralRaptor> Dropping an asteroid on yourself to own the birbs.
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<bofh> UmbralRaptor: ahh, fair.
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<bofh> a9ec1b1359251fdb4d06efb95dc19ebcfb39e72e08253e5ab2d603de5800f500
<SnoopJeDi> gesundheit
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<egg|cell|egg> Bofh: meow
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<egg|zzz|egg> bofh: http://adsabs.harvard.edu/abs/1993MNRAS.263..287K Ꙩ_ꙩ "The Analysis of Indexed Astronomical Time Series", a sequence of 10 papers published over 14 years
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<kmath> <✔kylegriffin1> Federal workers have now missed a second paycheck.
<bofh> ~/win 20
<egg|work|egg> bofh win32
<kmath> <reverschansons> Jamais vais te donner haut ⏎ Jamais vais te laisser bas ⏎ Jamais vais courir autour et te déserter ⏎ Jamais vais te faire… https://t.co/8vnvIXiO7k
<egg|work|egg> bofh: . . .
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<UmbralRaptor> bofh:
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<kmath> <jfbastien> Today's episode of "something I didn't know about C99": ⏎ ⏎ int derp(int arr[static const restrict volatile 5]); ⏎ ⏎ I kn… https://t.co/Yu130KvijB
<egg|zzz|egg> whitequark: does that mean the syntax for a non-null pointer to T in C99 is T ptr[static 1]
<egg|zzz|egg> yup https://gcc.godbolt.org/z/vA3E3H Ꙩ_ꙩ
<egg|zzz|egg> and adding consts as appropriate, "ptr : constant access not null constant T" is T const ptr[static const 1]
<UmbralRaptor> "I have chosen a method (from Alan Macdonald, private communication) that I think is both conceptually straightforward and exposes the most important conceptual issues."
<UmbralRaptor> This is a line in a textbook, btw.
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<bofh> UmbralRaptor: *blank stare*
<egg|zzz|egg> bofh: meow
<UmbralRaptor> bofh: All that for deriving the Lorentz transform.
<UmbralRaptor> (Because TRIANGLE!)
<bofh> UmbralRaptor: why does everyone's treatment of Spec. Rel. suck in a "this is unnecessarily complicated" way?
<UmbralRaptor> Not sure
<egg|zzz|egg> UmbralRaptor: triangle?
<egg|zzz|egg> bofh: meow
<egg|zzz|egg> UmbralRaptor: meow
<UmbralRaptor> ACTION pets egg|zzz|egg with a hexagon ⌬
<UmbralRaptor> egg|zzz|egg: special relativity works because of triangles. Look at the classic light clock eggsample.
<egg|zzz|egg> UmbralRaptor: ah, the /topic triangles strike again
<bofh> You mean light ones, right?
<bofh> light CONES*
<bofh> fucking hell I'd describe the inet right now as barely usable.
<SnoopJeDi> UmbralRaptor, a few years ago we had to pile into a vehicle and drive ~15 hours to New Mexico for an APS section meeting on our advisor's whim. The upshot was that we got to see the most remarkably long-winded discussion of geometry ever.
<SnoopJeDi> talk format was I think 10+2, this guy is on slide...5? explaining how this triangle is similar to that triangle and this is similar to that in laborious detail, and he got cut off.
<SnoopJeDi> it was a pretty cool subject, too. electron beam shadowing effects. shame he didn't get to any of that because of all the "welcome to ray optics 100"
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* UmbralRaptor stares at the predictions for lanthanum and yttrium hydride superconductors. Tc ~250-320 K 😳
* egg|zzz|egg continues to boggle at T[static 1]
<UmbralRaptor> ?
<bofh> UmbralRaptor: at what pressures?
<UmbralRaptor> (Insert joke about room pressure superconductivity here)
<whitequark> peer pressure superconductivity
<UmbralRaptor> Bully Caused Superconductivity theory
* UmbralRaptor 🔪 UmbralRaptor for that pun
<SnoopJeDi> "the phonons — terrified of losing their lunch money — condense into a defense structure and run away from the bully"
<bofh> LOL
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* egg|zzz|egg meows at whitequark
* egg|zzz|egg meows at bofh
* egg|zzz|egg meows at meowing itself
* UmbralRaptor chirps
<egg|zzz|egg> bofh: you garbled the capitalization https://twitter.com/bofh453/status/1088928354840006664
<kmath> <bofh453> TIL "бнопня" is a meme on runet.
<egg|zzz|egg> bofh: иТ ИС СУППОСЕД ТО БЕ ЦАПИТАЛИЗЕД ЛИКЕ ТХИС, СО ТХАТ цЫРИЛЛИЦ ВИТХ ТХЕ ХИГХ БИТ ДРОППЕД ТУРНС ИНТО А *ЦАСЕ-ИНЖЕРТЕД* ТРАНСЛИТЕРАТИОН.
<egg|zzz|egg> whitequark: how cursed is taking ASCII, setting the 8th bit, and decoding that as КОИ-8 :-p
<whitequark> egg|zzz|egg: (re bofh message) my eyeballs just melted
* egg|zzz|egg pets whitequark
<bofh> mine just melted too
<bofh> and right, I did garble the capitalization, oops. >_<
<egg|zzz|egg> my laptop just died and now it won't boot
<bofh> for once I am not to blame
<egg|cell|egg> Nevermind it's booting now
<egg|zzz|egg> <whitequark> egg|zzz|egg: (re bofh message) my eyeballs just melted <bofh> mine just melted too << нОВ и АМ БЕЦОМЕ егг, ТХЕ ДЕСТРОЫЕР ОФ ЕЫЕБАЛЛС
<whitequark> tgis is disturbing
* egg|zzz|egg scritches whitequark