egg|nomz|egg 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.
<egg> ferram4_: so, remember that Principia has a psychohistory, now I'm working on something that will make the psychohistory parameters configurable by solar system administrators :D
<egg> (the important part is mostly that it allows the ephemeris parameters to be configured, but might as well do the others too, see #1666)
<Qboid> [#1666] title: Support setting the integrator parameters in the gravity_models file | @GregroxMun makes strange systems that are stable but completely confuse our default symmetric linear multistep method with its default step size.... | https://github.com/mockingbirdnest/principia/issues/1666
<egg> bofh: yes I am good at names,
<ferram4_> Every time you say "psychohistory" I imagine that Principia includes a room that every couple centuries or so a hologram of long-dead eggrobin and pleroy show up to talk about the current crisis and how it was resolved.
<egg> it's actually just a lecture in numerical analysis
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<egg> ferram4_: I mean, of course there are no numerical analysts in the Foundation
<bofh> egg: sec
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<kmath_> <ordithhyrolex> I couldn't get him to look at the camera #finnthemoose #cats https://t.co/SETPw7HhLb
<egg> ferram4_: how's the next version of FAR coming along
<ferram4_> It seems alright, should need only a little more testing
<egg> what will its name be
<egg> ferram4_: also, you should clearly have a well-defined release cycle like principia
<egg> timed on something aerodynamical rather than astronomical though
<ferram4_> Those kinds of regular things don't happen in aerodynamics
<egg> release every hurricane
<Iskierka> determined by what threshold? Does he have to do two releases if it is temporarily dropped to below hurricane and re-intensifies?
<UmbralRaptor> Also, Atlantic hurricanes? East Pacific? West Pacific and Indian Ocean typhoons?
<UmbralRaptor> I guess you could designate the first and last days of the Atlantic hurricane season as release dates.
<egg> !wpn bofh
* Qboid gives bofh a cube
<egg> Iskierka: yes
<kmath_> <JSEllenberg> Q: Why is the 2-sphere the only Riemann surface that's the identity for connected sum? A: Because it's a very stable genus
<egg> if someone dropped the moon's perigee, we would have to release more often
<bofh> !wpn egg
* Qboid gives egg an icy photoresistor
<egg> !wpn -add:wpn psychohistory
<Qboid> egg: Weapon added!
<egg> !wpn bofh
* Qboid gives bofh a noun magma
<egg> bofh: I have good identifiers in principia :-p
<bofh> egg: [[Citation Needed]]
<egg> (and a good identifier :-p)
<kmath_> <ApprovedNews6> LIFESTYLE: 4 Fun Lifehacks You Can Do With Just A Vial of Blood, A Pair of Antlers, A Carving Knife, & A Few Simple Phrases in Akkadian
* UmbralRaptor stares at his poster.
UmbralRaptor is now known as NomalRaptor
<bofh> egg: okay I APPROVE
<egg> bofh: of the integrator, or the psychohistory
<egg> bofh: see also <ferram4_> Every time you say "psychohistory" I imagine that Principia includes a room that every couple centuries or so a hologram of long-dead eggrobin and pleroy show up to talk about the current crisis and how it was resolved.
<SnoopJeDi> Our 5e campaign spent today's session in a very exclusive private library. We got blood-bound rings that permit us entrance!
* egg gives NomalRaptor some aquia regia
* NomalRaptor makes some traps to collect goblinite.
<egg> bofh: multisteps integrator are weird sometimes
<egg> they're really fast, but as soon as your step gets too large they go completely wonky because they're stateful
<egg> bofh: e.g. Kepler orbit integrated with too long a timestep, instead of wildly precessing or something normal like that, it just escapes and oscillates https://www.youtube.com/watch?v=wdWHYeR7PZk&feature=youtu.be
<kmath_> YouTube - Kerbin Binary, 2,400,000m sma
<egg> which feels weird tbh, because they're supposed to be conjugate-symplectic?
<NomalRaptor> Gah, just discovered a bug in someone else's code.
<SnoopJeDi> GitHub?
<egg> tarballs of FORTRAN IV?
* NomalRaptor moos at egg.
<NomalRaptor> SnoopJeDi: technically yes. Simulated astronomical observing that is counting an unphysical bootstrapping observation as a real one.
<SnoopJeDi> At least an issue is a possibility, then!
<NomalRaptor> egg: wait, FORTRAN IV predates tar by a decade or so, right?
<egg> yeah
<egg> tarballs would be more likely to contain FORTRAN 77 or at least 66, but maybe some legacy code thrown into the shiny new archive format? :-p
<NomalRaptor> Well, as long as someone didn't cover a stack of punchcards in pinetar.
<NomalRaptor> SnoopJeDi: Yes, though it could be annoying to try to merge a patch. Scientific codes being what they are. (and I messed with a lot of things, getting it running and understanding the internals)
<SnoopJeDi> I meant even as just a report, if there's not one already
<SnoopJeDi> But yea, I know what you mean
<bofh> egg: wait, the timestep doesn't ever reduce if it starts diverging?
<SnoopJeDi> One of my most career-relevant PRs is -4 char, +2 char (changing `None` to `[]`), heh
<egg> bofh: fixed stepsize
<bofh> egg: ahh.
<egg> bofh: it's symplectic
<bofh> ah, gotcha.
<egg> bofh: and we have no mechanism to warn that things have gone haywire, I should write something to have a monitoring integrator with a smaller stepsize running in the background
<bofh> SnoopJeDi: a good chunk of my most important changes were... okay, the impetus was +14 chars
<bofh> "implicit none"
<bofh> *many, many* more chars followed that tho.
<egg> bofh: and of course warn that an apocalypse happened https://twitter.com/whitequark/status/836460976648024065
<kmath_> <whitequark> [ 12.9Gy] (system) FATAL: Apocalypse occurred at:Stream corrupted https://t.co/Ok8RBjbwY7
<bofh> I love how many bugs I've stumbled into that can be summarized as "someone typo'd a variable name & the Fortran compiler decided that it should be a new float & set to whatever garbage was on the top of the stack instead of doing the sane thing and throwing a fucking error"
<bofh> egg: yeah, monitoring integrator is usually what I do
<SnoopJeDi> probably my most meaningful work was refactoring a several-hundred-line method into a few. It was depressingly simple.
<SnoopJeDi> If you're writing Python and end up 10 indent layers in, you *probably* want a few extra methods
<bofh> YEP
<bofh> mind you, 17 indent layers in Fortran is not hard in compchem code
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* egg pokes name mangling with a stick
<egg> ??0?$Ephemeris@U?$Frame@W4Frame_PluginTag@serialization@principia@@$06$00@internal_frame@geometry@principia@@@internal_ephemeris@physics@principia@@QEAA@$$QEAV?$vector@V?$not_null@V?$unique_ptr@$$CBVMassiveBody@internal_massive_body@physics@principia@@U?$default_delete@$$CBVMassiveBody@internal_massive_body@physics@principia@@@std@@@std@@@base@principia@@V?$allocator@V?$not_null@V?$unique_ptr@$$CBVMassiveBody@internal_massi
<egg> ve_body@physics@principia@@U?$default_delete@$$CBVMassiveBody@internal_massive_body@physics@principia@@@std@@@std@@@base@principia@@@std@@@std@@AEBV?$vector@V?$DegreesOfFreedom@U?$Frame@W4Frame_PluginTag@serialization@principia@@$06$00@internal_frame@geometry@principia@@@internal_degrees_of_freedom@physics@principia@@V?$allocator@V?$DegreesOfFreedom@U?$Frame@W4Frame_PluginTag@serialization@principia@@$06$00@internal_frame@g
<egg> eometry@principia@@@internal_degrees_of_freedom@physics@principia@@@std@@@5@AEBV?$Point@V?$Quantity@U?$Dimensions@$0A@$0A@$00$0A@$0A@$0A@$0A@$0A@@internal_quantities@quantities@principia@@@internal_quantities@quantities@principia@@@internal_point@geometry@3@AEBV?$Quantity@U?$Dimensions@$00$0A@$0A@$0A@$0A@$0A@$0A@$0A@@internal_quantities@quantities@principia@@@internal_quantities@quantities@3@AEBVFixedStepParameters@0123@@Z
<SnoopJeDi> um
<egg> fhtagn
<bofh> iterate over atoms, iterate over center 1 shells (4 loops), iterate over center 2 shells (4 loops), iterate over primitives for each of those (4 loops each)
<bofh> um
<bofh> SnoopJeDi: http://csclub.uwaterloo.ca/~pbarfuss/symred.f still the most horrible code I've ever had to refactor
<SnoopJeDi> hah I recall trying to squint at that for longer than I should've
<bofh> SnoopJeDi: and by "horrible" I mean uh so the flow control there is so incomprehensible what I did was output ifort -O2 -unroll0 -fno-omit-frame-pointer -S to a file, then rewrite new Fortran from the compiled asm.
<bofh> because the optimized assembly had much clearer flow control.
<bofh> LOL
<bofh> egg: ugh, VC++ name mangling is a mess.
<SnoopJeDi> ya done goofed when the compiler produces something more readable than your input 😹
<egg> bofh: well tbh not sure this would mangle more nicely under another scheme
<egg> bofh: the demangled names are illegible, which is annoying :-p
<bofh> egg: true, but like at least I can *somewhat* mentally demangle Itanium ABI. :P
<NomalRaptor> The problem here is that fixing the bug would probably be less like 14 characters, and more like 5 or so lines in an entirely different file. >_>;;
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<SnoopJeDi> Yea, fixing it is generally a much taller order
<bofh> !u ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
<Qboid> bofh: Too many characters! (Maximum: 10)
<bofh> !u ▄▄▄▄
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<bofh> !u ▄▄▄▄▄▄
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<Qboid> U+2584 LOWER HALF BLOCK (▄)
<kmath_> <Zaikarion> @ApprovedNews6 @bofh453 1. 𒂁𒃻𒋫𒆸𒄷𒄭𒄿 2. 𒋛𒁰𒈦 3. 𒈾𒀜𒁀𒄷 4. 𒅗𒅗𒋛𒂵𒌵𒆠
<NomalRaptor> bofh:… what does it say?
<bofh> "1. a vial of blood, 2. antlers, 3. sumerogram for carving knife, 4. (many) akkadian phrases/proverbs"
<bofh> I think 1. is also a sumerogram, but I'm not 100% sure
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<bofh> !u AАΑ
<Qboid> U+0041 LATIN CAPITAL LETTER A (A)
<Qboid> U+0410 CYRILLIC CAPITAL LETTER A (А)
<Qboid> U+0391 GREEK CAPITAL LETTER ALPHA (Α)
<NomalRaptor> Once again bitten by the gap between how productive I am, and how productive I need to be. >_<
<egg> !wpn NomalRaptor
* Qboid gives NomalRaptor a fluent fractal dæmon
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<soundnfury> !wpn egg
* Qboid gives egg an einsteinium hedgehog
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<egg> https://twitter.com/stephentyrone/status/949977654593191936 lots of foxes here in zurich too, crossing the street or strolling in the garden at night
<kmath_> <stephentyrone> On the other hand, we keep seeing foxes on the side (so far not for long enough to get a picture, sorry @volatile_void)
<egg> !wpn -add:wpn fox
<Qboid> egg: Weapon added!
<NomalRaptor> With a UI like that, you'd better have a "launch ICBM" option. https://twitter.com/whitequark/status/949993364522520577
<kmath_> <whitequark> so far everything I've found related to r2 feels like a modern art project moreso than software… https://t.co/I4ksNaFUNa
<whitequark> LOL
<whitequark> !wpn -add:wpn ICBM
<Qboid> whitequark: Weapon added!
<whitequark> !wpn -add:wpn IRBM
<Qboid> whitequark: Weapon added!
<whitequark> !wpn -add:wpn SRBM
<Qboid> whitequark: Weapon added!
<whitequark> !wpn -remove:wpn SRBM
<Qboid> whitequark: Weapon removed!
<whitequark> !wpn -remove:wpn IRBM
<Qboid> whitequark: Weapon removed!
<whitequark> !wpn -add:wpn missile
<Qboid> whitequark: Weapon already added!
<whitequark> !wpn -add:adj ballistic
<Qboid> whitequark: Adjective added!
<whitequark> !wpn -add:adj intermediate-range
<Qboid> whitequark: Adjective added!
<whitequark> !wpn -add:adj short-range
<Qboid> whitequark: Adjective added!
<APlayer> Long-range?
<egg> !wpn whitequark
* Qboid gives whitequark a principle
<whitequark> !wpn -add:adj long-range
<Qboid> whitequark: Adjective added!
<whitequark> !wpn -add:adj intercontinetal
<Qboid> whitequark: Adjective added!
<whitequark> !wpn -remove:adj intercontinetal
<Qboid> whitequark: Adjective removed!
<whitequark> !wpn -add:adj intercontinental
<Qboid> whitequark: Adjective added!
<APlayer> Perhaps global/local too?
<egg> those might be in the adjectives for mathematical reason already
<APlayer> "Qboid gives someone a local ICBM" would be a fun combination
* APlayer just mistook "semisimple" for "seismic"
<APlayer> Also, while I am thinking "seismic"... "geologically-active" might be a fun adjective too, if it does not exist yet
<APlayer> And I am off for now, be back soon.
<NomalRaptor> !wpn add:adj seismic
* Qboid gives add:adj seismic a xi nickel
<NomalRaptor> !wpn -add:adj seismic
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn -add:adj terrestrial
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn -add:adj aquatic
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn -add:adj oceanic
<Qboid> NomalRaptor: Adjective already added!
<NomalRaptor> !wpn -add:adj benthic
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn -add:adj abyssal
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn -add:adj maritime
<Qboid> NomalRaptor: Adjective already added!
<NomalRaptor> !wpn -add:adj atmospheric
<Qboid> NomalRaptor: Adjective added!
<NomalRaptor> !wpn stats
* Qboid gives stats a SOX-compliant sequence point
<NomalRaptor> !wpn -stats
<Qboid> NomalRaptor: Total weapons: 785. Total adjectives: 989. Total possible combinations: 2414176841135.
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<egg> !wpn NomalRaptor
* Qboid gives NomalRaptor an ultraviolent heptagon
<egg> !wpn whitequark
* Qboid gives whitequark a polygonal odor
<egg> !choose blueprint|parameterization
<Qboid> egg: Your options are: blueprint, parameterization. My choice: blueprint
<egg> ;choose blueprint|parameterization
<kmath_> egg: blueprint
<egg> raptorchoose blueprint|parameterization
<APlayer> Blueprinterization
<NomalRaptor> Parameterprint
<APlayer> egg: Looks like you need to print blue today
<NomalRaptor> There appears to be a blue sky today.
<APlayer> Nice! Because there only appear to be clouds and no sky here
<APlayer> Since early November, even
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<soundnfury> ... bluepeterization!
<soundnfury> (here's one I made earlier)
<APlayer> Peter disappoves
<APlayer> egg: When you write RK4 methods, how do you usually implement the RHS calculation of the ODE? As a function?
<APlayer> I am currently testing that, but I have some suspicion that it's the f(t, Y) function calls that make the few-iteration RK4 method take noticeable time to run
<APlayer> Is there some human-readable way to circumvent using a function for this (i.e. not actually writing it out for every k-parameter)?
<APlayer> ...nope, nevermind, it's not that
<egg> bofh: ah good I have reached the point where I have internal linker errors
<egg> everything is fine
<egg> tbh it seems I have internal compiler errors too, but I'm used to that
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<egg> !wpn whitequark
* Qboid gives whitequark a reversed pigeon
<egg> !wpn bofh
* Qboid gives bofh a Bayesian gasket
* egg pokes SetDllDirectory with a stick
* NomalRaptor 🔪 cython in the Unicode support.
NomalRaptor is now known as UmbralRaptor
<UmbralRaptor> Also, either I'm doing things wrong, or it offers a 0% speedup.
<kmath_> YouTube - Tablet robot experiment thing @scanlime-in-progress
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<kmath_> <johnregehr> basically everything in my house is this color https://t.co/s81XFjaIv0