UmbralRaptor 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> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
<bofh>
egg|zzz|egg: true.
<UmbralRaptor>
egg|zzz|egg: Tuco the telescope operator?
<bofh>
egg|zzz|egg: helps I also learned Functional Analysis properly immediately after. And then convex geometry/optimization.
* egg|zzz|egg
still not clear whether UmbralRaptor has opposable thumbs
<egg|zzz|egg>
bofh: that I haven't learned :-p
<egg|zzz|egg>
(see also principia just having a Bisect for root finding :-p)
<kmath>
<sigfig> was there ever a time when it was actually easier to learn a field of math from introductory texts rather than from current research
<egg|zzz|egg>
(amusingly sigfig starred the principia repo :-p)
<bofh>
yeah see I basically use the most optimal root finder that I can apply.
<bofh>
which usually means L-BFGS with DIIS extrapolation.
<egg|zzz|egg>
bofh: going through the list of people who starred the principia repository brings up strange things: a pole who writes Ada https://github.com/darkestkhan
<UmbralRaptor>
Are they doing condensed matter physics?
<bofh>
Huh, apparently a heaping tablespoon is a bit too much extra salt for instant noodles, even for me.
<bofh>
Had to dilute it a bit with water >_>
<Iskierka>
"heaped <>spoon" is the worst kind of measurement
<Iskierka>
different materials heap differently. Even different brands
<bofh>
~4.5g granulated iodized table salt, according to a scale (4533mg in this test)
<bofh>
better? :P
<Fiora>
4.5g? that's a pretty reasonable amount of salt
<Fiora>
i may be biased
<Fiora>
as someone who eats soy sauce plain
<bofh>
Fiora: I've gone that, it's tasty.
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<egg|zzz|egg>
bofh: what percentage in mass does that represent
<egg|zzz|egg>
(I am terrible at sleeping >_<)
<egg|zzz|egg>
!wpn Iskierka
* Qboid
gives Iskierka a 22 AWG snakehead
<bofh>
egg|zzz|egg: percentage in mass?
<egg|zzz|egg>
of the food
<egg|zzz|egg>
(because I have a hard time figuring out how salty those 4.5 g are if I don't know what's around them :-p)
<bofh>
add another 650mg (actually prolly more than that, since that's just Sodium) from the flavour packet and so the whole ~5.1g is dissolved in ~450mL of water.
<bofh>
...I swear to fucking god this terrible bro-country song I heard on the radio at the local 24-hour convenience store AUTOTUNED THE GUITAR TRACK.
<egg|zzz|egg>
!wpn bofh, Fiora, Iskierka, et al.
* Qboid
gives bofh, Fiora, Iskierka, et al. a RS-232 Taylor bustard which vaguely resembles an explosion
egg|zzz|egg is now known as egg|afk|egg
<egg|afk|egg>
!wpn whitequark
* Qboid
gives whitequark an expected Toblerone which vaguely resembles a PDF
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<egg|work|egg>
!wpn whitequark
* Qboid
gives whitequark a nitrated dynamo
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UmbralRaptor is now known as InfectedRaptor
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<egg|work|egg>
!wpn InfectedRaptor
* Qboid
gives InfectedRaptor a Jovian zeta motor/chlorofluorocarbon hybrid
<APlayer>
InfectedRaptor: Uh, get well soon?
<InfectedRaptor>
APlayer: I'll try.
<InfectedRaptor>
!wpn egg
* Qboid
gives egg a fluorine spectrometer-like involution
<APlayer>
Qboid has a fluorine surplus, currently?
<kmath>
<stephentyrone> @FioraAeterna Optimal multiply chains are NP complete in the stupidest way possible—the obvious trivial algorithm i… https://t.co/DFUgN9DLXL
<egg|work|egg>
!wpn Fiora
* Qboid
gives Fiora a triaxial profuct
<InfectedRaptor>
egg|work|egg: because the "India" editions cost $20, while US ones cost $200.
<egg|work|egg>
Fiora: alternatively, do the thing with some additional precision so you're last-bit-precise on the product, and then reorder *that* to keep it correct
<Fiora>
the best thing about """precise""" floating point
<Fiora>
is that the precise order of roundoffs matters
<egg|work|egg>
yeah, I know
<Fiora>
so you can be wrong by being more correct
<egg|work|egg>
I badly worded that
<egg|work|egg>
I meant "consider the problem of reordering while keeping the correctness of the whole, on e.g. code that does last-bit-precise multiplication of 5 binary64 floating point numbers"
<egg|work|egg>
(mind you there might be no such reorderings, I'm even sure what the code would look like to start with)
<egg|work|egg>
Fiora: I *think* you need an FMA to do exact double-double multiplication, you might need one there too?
<TechnicallyAsleep>
Hullo eggping
<egg|work|egg>
o/
<egg|work|egg>
TechnicallyAsleep: there's someone on the principia thread who seems rather excited about their feature request :-p
<kmath>
<FioraAeterna> @RichFelker @pikhq i'm part of the cabal that tells people to never use == on floats
<egg|work|egg>
(though I guess given what you've told me of graphics things that might be sound advice for graphics)
<Fiora>
It's probably okay for things like zero and so on
<Fiora>
I mean, graphics is that wonderful place where people just use clamp() every 4 ops
<Fiora>
lol
<egg|work|egg>
:D
<egg|work|egg>
Fiora: so from the "I can actually assume IEEE 754 and non-flushed denormals" side of things == often means "I'm removing a removable singularity" or something like that (need to look at the conditioning around it often, but not in principle bad)
<TechnicallyAsleep>
well Scotskerb has an interesting quirky behaviour with a mod.
<egg|work|egg>
TechnicallyAsleep: yeah just saw that
<egg|work|egg>
Fiora: also testing of course, where I have things that I know should be exact; but that's rather a special case
<egg|work|egg>
bofh: hm, what are uses of equality that are not tied to removing a removable singularity
<TechnicallyAsleep>
insert identity politics based joke here.
<kmath>
<FioraAeterna> @RichFelker @pikhq fun fact: there's a GPU where in some cases (max(a,b) == a || max(a,b) == b) returns false for non-NaN inputs
* egg|work|egg
heads home
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<bofh>
At the very least that turns into a usable DE.
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<InfectedRaptor>
It ends up being r" + Ar^-2 + B = 0, right?
* egg
confused
<bofh>
Erm, r^-1 unless you misplaced a bracket.
<bofh>
on the A term.
<egg>
for 2b, I'd think one could poke at the force for perturbed r around ρ and expand that to get an ODE for the radial perturbation in the nearly-circular case?
<egg>
but then I get the wrong signs to start with
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<egg>
argh right in the rotating frame, a radial perturbation isn't going to work >_<
<egg>
bofh: but shouldn't some manner of perturbative thing in the rotating frame work? though if it's not a radial perturbation maybe it's not worth it
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<egg>
!wpn bofh
* Qboid
gives bofh a Radon capacitive star
<egg>
!wpn whitequark
* Qboid
gives whitequark an adiabatic gantlet
<egg>
!wpn Fiora
* Qboid
gives Fiora a pressurized honed eidolon
<egg>
!wpn InfectedRaptor
* Qboid
gives InfectedRaptor a torx fibre
egg is now known as egg|zzz|egg
<whitequark>
!wpn egg
* Qboid
gives egg an unremarkable resonance
<InfectedRaptor>
!wpn egg|zzz|egg
* Qboid
gives egg|zzz|egg an antimony interferometer which strongly resembles a perturbation
<whitequark>
котя is better
<InfectedRaptor>
… a perturbation? AAAAAAA
<whitequark>
especially when left alone without the kitten running around
<egg|zzz|egg>
whitequark: yay!
<egg|zzz|egg>
whitequark: where is the kitten?
<egg|zzz|egg>
whitequark: also, do you have any котяpics?
<egg|zzz|egg>
whitequark: also do you know what's going on with the modules proposal and the weird clang modules? they seem nearly unrelated somehow Ꙩ_ꙩ
<Qboid>
egg|zzz|egg: I added the explanation for this acronym.
* egg|zzz|egg
pokes Coriolis with a stick
<egg|zzz|egg>
bofh: InfectedRaptor: ok I'm not convinced that trying to look at differential equation for the perturbation from the circular orbit in the rotating frame leads to sanity
<InfectedRaptor>
Hah
<InfectedRaptor>
… wait, I should have eaten today.
<egg|zzz|egg>
ask whitequark to teach you how to catch a moth?