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.
<awang> Dangit
<awang> Do no brackets work?
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<Qboid> 0d 2h 0m 0s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
<egg|laptop|egg> awang: MSVC, you need an UTF-8 BOM
<egg|laptop|egg> clang will accept it
<egg|laptop|egg> (with --std=c++11 or later)
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<egg|laptop|egg> "u ғ
<egg|laptop|egg> !u ғ
<Qboid> U+0493 CYRILLIC SMALL LETTER GHE WITH STROKE (ғ)
* egg|laptop|egg stares at Fiora
<egg|laptop|egg> !u ᴄʟᴀssɪғɪᴇᴅ
<Qboid> egg|laptop|egg: Too many characters! (Maximum: 10)
<egg|laptop|egg> ᴄ
<egg|laptop|egg> !u ᴄ
<Qboid> U+1D04 LATIN LETTER SMALL CAPITAL C (ᴄ)
<egg|laptop|egg> yeah the others look fine
<Qboid> 0d 1h 0m 0s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
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<UmbralRaptor> Kinda curious as to the error on sin(x) for x in the 1 arcsec to 1 μarcsec range. https://twitter.com/stephentyrone/status/958802849273667589
<kmath> <stephentyrone> @johnregehr @FioraAeterna -fphysicist-math: Enables aggressive unsafe-math transforms like cos(x) --> 1 and sin(x) --> x.
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<UmbralRaptor> <4e-12 at the high end.
<UmbralRaptor> Our estimates of the distance to α-Cen could be off by over a hundred kilometers!
<soundnfury> -fastrophysicist-math: Enables more aggressive unsafe-math transforms like π --> 1, tan(x) --> 1 and in fact pretty much anything --> 1.
<soundnfury> !wpn UmbralRaptor
* Qboid gives UmbralRaptor a proactinium keyword which vaguely resembles a parabola
<UmbralRaptor> π, c, G, etc going to 1 is more of theoretical physics.
* soundnfury gives UmbralRaptor a system of unnatural units
<UmbralRaptor> soundnfury: I already use foot-pound-seconds in day to day life.
<soundnfury> furlong-firkin-fortnight or gtfo
<Qboid> 0d 0h 30m 0s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
<Qboid> 0d 0h 10m 0s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
<icefire> !koutdown 20
<icefire> !kountdown 20
<Qboid> icefire: ID: 20 | Name: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а | Time: 2018-02-01 02:07:18 | Unixtime: 1517450838 | Left: 0d 0h 7m 57s
<Qboid> icefire: Description: A Союз-2.1а with Фрегат-М upper stage will launch two Канопус-В satellites (http://space.skyrocket.de/doc_sdat/kanopus-v.htm) from Площадка 1С (Восточный) into a heliosynchronous orbit.
<Qboid> 0d 0h 2m 30s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
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<Qboid> 0d 0h 0m 0s left to event #20: Канопус-В 3 & 4, S-Net 1–4, Lemur-2 z1–z4/Фрегат-М/Союз-2.1а [at 2018-02-01 02:07:18]. Say '!kountdown 20' for details
<Qboid> 1d 0h 0m 0s left to event #21: [at 2018-02-02 07:30:00]. Say '!kountdown 21' for details
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<egg|laptop|egg> !acr -add:SALMON Stand ALone Missions of Opportunity Notice
<Qboid> egg|laptop|egg: I added the explanation for this acronym.
<egg|laptop|egg> !wpn UmbralRaptor
* Qboid gives UmbralRaptor an apochromatic Lizzie
<kmath> <diodebot> shoggoth-conducting quantum diode (SCQD)
<egg|laptop|egg> bofh: huh, there was a livestream for the last KD: https://www.youtube.com/watch?v=4VOwc-pdBkw
<kmath> YouTube - LIVE: Soyuz launches satellites into orbit from Vostochny Cosmodrome
<egg|laptop|egg> !kd next
<Qboid> egg|laptop|egg: ID: 21 | Name: | Time: 2018-02-02 07:30:00 | Unixtime: 1517556600 | Left: 0d 20h 53m 39s
<Qboid> egg|laptop|egg: Description: 长征二号丁 will launch 张衡一号 (CSES 1, http://space.skyrocket.de/doc_sdat/zhangheng-1.htm) from 酒泉 into a 500 km circular orbit.
<egg|laptop|egg> that one will be https://www.youtube.com/watch?v=s5OiWm4Gn7I
<kmath> YouTube - SS-520 5号機による超小型衛星打ち上げの実証実験
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<Qboid> 0d 18h 0m 0s left to event #21: [at 2018-02-02 07:30:00]. Say '!kountdown 21' for details
<kmath> <valarauca1> animal abuse https://t.co/wZtVNnE8qs
<Iskierka> is that a different event qboid has or is the time wrong? Since the stream says 35 hours
<egg|laptop|egg> got delayed
<egg|laptop|egg> !kd -edit:21 time 2018-02-03T05:03Z
<Qboid> egg|laptop|egg: Updated event #21: - 长征二号丁 will launch 张衡一号 (CSES 1, http://space.skyrocket.de/doc_sdat/zhangheng-1.htm) from 酒泉 into a 500 km circular orbit. - 2018-02-03 05:03:00
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<UmbralRaptor> Ooh, upgrading to 10.11.13.3 did *not* break xtools.
<APlayer> It remains to be determined whether that's a good thing
<egg|laptop|egg> bofh: Should I apply Fiora's rule for optimizations to #1704
<Qboid> [#1704] title: Use polynomials to implement the continuous trajectories | The benchmarks are uniformly faster. Some (the ones that only exercise `Prolong`) marginally so (4-5%), probably because the Newhall construction got a wee bit faster. Others (the ones that exercise `EvaluatePosition`) by a factor that goes up to 1.4x-1.5x. The numbers are as follows:... | https://github.com/mocking
<Qboid> birdnest/principia/issues/1704
<egg|laptop|egg> bofh: (going from Чебышёв with Clenshaw to monomial with Estrin)
<bofh> so I find even collapsing a Chebyshev series to a monomial then using bog-standard Horner is faster pretty consistently (at the expense of a few more ULP error, sigh). If Estrin is faster than Horner still and polynomial evaluation is in the critical path, those numbers *can* be reasonable & correct.
<bofh> Test it a lot anyway, ofc.
<egg|laptop|egg> bofh: yeah our Estrin is consistently faster than our Horner somehow
<egg|laptop|egg> see #1682
<Qboid> [#1682] title: Optimize Estrin evaluation by stopping the recursion at 0 and 1 and doing more inlining | Now uniformly faster than Horner:... | https://github.com/mockingbirdnest/principia/issues/1682
<bofh> like the only times I explicitly use Clenshaw are when I need to get those last < 10 or so ULP error from the faithfully rounded case. It's a fundamentally serial algorithm with a very blatant instruction stall, since each iterate needs the result of the last to be computed.
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<egg|laptop|egg> bofh: uh oh the Fiora heuristic might hold https://github.com/mockingbirdnest/Principia/pull/1704#issuecomment-362400362
<Qboid> [#1704] title: Use polynomials to implement the continuous trajectories | The benchmarks are uniformly faster. Some (the ones that only exercise `Prolong`) marginally so (4-5%), probably because the Newhall construction got a wee bit faster. Others (the ones that exercise `EvaluatePosition`) by a factor that goes up to 1.4x-1.5x. The numbers are as follows:... | https://github.com/mocking
<Qboid> birdnest/Principia/issues/1704
<egg|laptop|egg> bofh: also, today's macro name: PRINCIPIA_NEWHALL_APPROXIMATION_IN_ЧЕБЫШЁВ_BASIS_CASE
<bofh> wait, is unicode allowed in C preprocessor defines?!?
<egg|laptop|egg> bofh: in C++, you have a bunch of UCS characters allowed in identifiers (and allowed initially), and preprocessor definitions just define identifiers
<awang> egg|laptop|egg: What's the Fiora heuristic?
<kmath> <FioraAeterna> a table of my reactions based on how much a new compiler optimization helps: 0.001%: meh, i give up 0.01%: i guess… https://t.co/8ls1GTlA5C
<awang> Heh
<awang> That sounds like a good heuristic
<egg|laptop|egg> whitequark: how is котя doing?
<whitequark> egg|laptop|egg: still pregnant
<egg|laptop|egg> !kd next
<Qboid> egg|laptop|egg: ID: 22 | Name: TRICOM 1R/SS-520 5号機 | Time: 2018-02-03 05:00:00 | Unixtime: 1517634000 | Left: 1d 5h 55m 33s
<Qboid> egg|laptop|egg: Description: The SS-520 5号機 will launch the 3U cubesat TRICOM 1R (http://space.skyrocket.de/doc_sdat/tricom-1.htm) from 内之浦 KS into an eccentric orbit with a 31° inclination.
<egg|laptop|egg> wait isn't it the long march?
<egg|laptop|egg> !kd 23
<Qboid> egg|laptop|egg: ID: 23 | Name: Falcon Heavy | Time: 2018-02-06 18:30:00 | Unixtime: 1517941800 | Left: 4d 19h 25m 14s
<Qboid> egg|laptop|egg: Description: A Falcon Heavy will launch a 1.3 t test payload (http://space.skyrocket.de/doc_sdat/tesla-roadster.htm) from LC-39A into an Earth escape trajectory.
<egg|laptop|egg> !kd 21
<Qboid> egg|laptop|egg: ID: 21 | Name: | Time: 2018-02-03 05:03:00 | Unixtime: 1517634180 | Left: 1d 5h 58m 7s
<Qboid> egg|laptop|egg: Description: 长征二号丁 will launch 张衡一号 (CSES 1, http://space.skyrocket.de/doc_sdat/zhangheng-1.htm) from 酒泉 into a 500 km circular orbit.
<egg|laptop|egg> ah I screwed up the day for the long march didn't I
<egg|laptop|egg> !kd -edit:22 time 2018-02-03T05:03Z
<Qboid> egg|laptop|egg: Updated event #22: TRICOM 1R/SS-520 5号機 - The SS-520 5号機 will launch the 3U cubesat TRICOM 1R (http://space.skyrocket.de/doc_sdat/tricom-1.htm) from 内之浦 KS into an eccentric orbit with a 31° inclination. - 2018-02-03 05:03:00
<egg|laptop|egg> !kd -edit:21 time 2018-02-02T07:50Z
<Qboid> egg|laptop|egg: Updated event #21: - 长征二号丁 will launch 张衡一号 (CSES 1, http://space.skyrocket.de/doc_sdat/zhangheng-1.htm) from 酒泉 into a 500 km circular orbit. - 2018-02-02 07:50:00
* egg|laptop|egg stares at backlog
<egg|laptop|egg> Iskierka: right, it was a different event, I was confused
<egg|laptop|egg> !kd next
<Qboid> egg|laptop|egg: ID: 21 | Name: | Time: 2018-02-02 07:50:00 | Unixtime: 1517557800 | Left: 0d 8h 39m 3s
<Qboid> egg|laptop|egg: Description: 长征二号丁 will launch 张衡一号 (CSES 1, http://space.skyrocket.de/doc_sdat/zhangheng-1.htm) from 酒泉 into a 500 km circular orbit.
<egg|laptop|egg> probably no livestream for that one
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