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.
<UmbralRaptor>
yay
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<egg>
!wpn bofh
* Qboid
gives bofh a zonal Poké Ball with a gegenschein attachment
<egg>
bofh: no idea what the error is in double precision though, is it as good as the 0,59 ULPs that Kahan has for double
<bofh>
egg: so I solve that problem by instead computing the reciprocal of cbrt(x), squaring it and multiplying it by the original number, taking care to not overflow.
<bofh>
(also you don't do any integer division there. it's division by a constant, so it's a multiply and a shift, both extremely fast)
<egg|cell|egg>
Ah right
<egg|cell|egg>
Hmm
<egg|cell|egg>
Still no answer from the cat on that matter?
<bofh>
I'm not sure if I handle all edge cases or how well it does compared to Kahan's paper, I need to do formal analysis of it sometime.
<bofh>
Said he'll get back soon, is a bit busy atm.
<egg|cell|egg>
Ow
* egg|cell|egg
pets the cat
<bofh>
Like I'm *pretty sure* I think I got all of them (actually let me just iterate over all possible floats when I get back to a computer and see what the max ULP error is, lol).
<egg|cell|egg>
How many doubles are there in [1,8[
<egg|cell|egg>
The periodicity should help
<egg|cell|egg>
Hmm still too many
<bofh>
Even in [1,2) there's too many, really.
<bofh>
SnoopJeDi: so one of the talks I went to was this one and holy fuck it was an amazing brisk overview of the field: http://calendars.illinois.edu/detail/2568?eventId=33301740 (I asked the speaker about posting slides online, he said he's not sure but will email them to me at least).
<bofh>
(also https://arxiv.org/abs/1108.3140 has a lot of it but it says a lot that this paper was maybe *half* the talk and about a quarter of it has since been shown to not quite be the case)
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<UmbralRaptop>
It's amusing how DSS images of high proper motion stars look like they have chromatic abberation. Or are outright split into orange and blue.
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<UmbralRaptop>
!wpn -add:wpn bolometer
<Qboid>
UmbralRaptop: Weapon added!
<UmbralRaptop>
!wpn -add:adj bolometric
<Qboid>
UmbralRaptop: Adjective added!
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<bofh>
UmbralRaptop: I mean aren't all spacecraft imagers filtered cameras, and so your blue and your orange pictures are taken a fraction of a second apart and hence wom't combinenicely if your target has high proper motion?
<UmbralRaptop>
bofh: Yes, though DSS was from ground based surveys that took a number of years,
<bofh>
oh, then you get bonus atmospheric ""fun"", too.
<bofh>
also sadly not familiar enough with that manga to answer re: that character, tho it seems like an interesting series in any case.
<UmbralRaptop>
ah
<UmbralRaptop>
Today in random observations: since its discovery in 1916, Barnard's star has moved ~17.6' (or, more than half the apparent diameter of the moon)
<bofh>
that's considerably more than I'dve expected tbh.
<bofh>
anyway feel free to try another char :P
* UmbralRaptop
blames Fiora for thinking in terms of anime and manga.
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<egg|cell|egg>
Bofh: U+A66E
<egg>
!wpn whitequark
* Qboid
gives whitequark a doomed achromatic thesis-like bird
<kmath>
<NileMagazine> Nothing says “Easter” like two rabbit-headed demonic doorkeepers of the Underworld, holding rearing cobras. ⏎ This de… https://t.co/Rei39KdjS6
<egg>
bofh: so the signed relative error after one rootn Newton always has the sign of n, but if it didn't have the sign of n beforehand it can grow quite a bit in absolute value?
<egg>
bofh: that might make its effect on the maxima annoying to understand
<egg>
bofh: hmmm, otoh Halley is monotone on the signed relative error
<bofh>
UmbralRaptop: by Marisa you mean the Touhou char, just to be sure?
<egg>
wait no not if it's very negative?
<bofh>
egg: the signed relative error of Newton does not behave nicely, yeah. :/ I *think* Halley isn't exactly monotone but it's close enough.
<egg>
halp I cannot into error analysis of householder methods
<bofh>
(again, I'll be more useful once this conference is over tonight)
<bofh>
yeah, their error analysis pretty consistently seems to focus on the absolute error in every paper I've read.
<egg>
bofh: ow, conference on easter week-end? :-/
<UmbralRaptop>
A kg of steel just weighs a kilogram. But a kilogram of feathers means you have to carry around the guilt of what you did to those poor birds.
<kmath>
<bofh453> + extremely enjoy wandering & travelling ⏎ + a fan of clever problem solving ⏎ + am basically nobody ⏎ - not vindictive ⏎ -… https://t.co/HNyeAPhY5I