// #eevblog — 2019-08-08
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01:49:55 Join: Nothing\ ([email protected]) to #EEVblog
01:57:39 <Nothing\> hrm i'm trying to figure out how to graph something but i can't figure it out
01:58:52 <Nothing\> i want to graph the change in a function for every given value of X, so for x^2 i'd want the difference between 1^2 and 2^2, then 2^2 and 3^2, then 3^2 and 4^2 and so on
02:05:21 <Nothing\> what'd that be like f(x)=x-n?
02:14:03 <Nothing\> or would the derivative give me the same information
02:24:07 <K> derivative
02:24:58 <T3sl4> x^2-(x-1)^2
02:25:20 <T3sl4> K: technically the forward difference, since it's discrete numbers, not the real-valued continuous derivative
02:26:00 <K> uh, didn't konw such thing existed
02:26:03 <T3sl4> which if you reduce it, is 2*1*x - 1
02:26:44 <Nothing\> T3sl4: : yeah that's what i was thinking
02:27:03 <T3sl4> there is of course formalism for it :) you use integers with a summation; and you might use related analysis in DSP, which is sampled (discrete time)
02:27:03 <Nothing\> about it being different from a derivative
02:27:52 <Nothing\> another thing i was meaning to ask, in this book of tables i have, it has tables for logs, sines, cosines, roots etc, but in one column it has "mean difference" and i can't figure out what it's for
02:28:08 <T3sl4> the limit as delta x --> 0, approaches the derivative (and this is the most common definition of it). Or as the number of terms in the series --> infty, becomes the riemann sum, which is equivalent to the integral
02:28:36 <T3sl4> calculus is actually about working with very small bits, or very large amounts thereof, respectively :)
02:28:54 <Nothing\> i'm just getting into calculus, or at least it's just starting to make sense to me, but holy crap do i love it
02:29:37 <T3sl4> "mean difference" seems to be a statistics thing; i'm not sure how tabular that would be
02:32:03 Join: ThunderSqueak ([email protected]) to #EEVblog
02:32:03 Mode: (by ChanOP) +o ThunderSqueak
02:36:33 <Nothing\> ah okay, statistics is one thing i've been meaning to look into as well
02:37:08 <Nothing\> i found a statistics mode on my dollar store scientific calculator i've been wanting to figure out, you can even enter data sets though the only thing i've figure out is how to use summation
02:40:25 <Nothing\> huh, apparently nintendo puts bitrex on the game cards for the switch, i just tasted one and sure enough it's absolutely horrid
02:40:39 <T3sl4> :P
02:40:41 <Nothing\> worst tasting games EVER!
02:40:56 <Nothing\> i can even taste it on my fingers if i handle the games
02:41:12 <T3sl4> it's pretty pernicious stuff ya
02:41:30 <Nothing\> i've never actually had/tried it before but i hear it's really potent
02:41:56 <T3sl4> you've absorbed, uh, something like nanograms i guess
02:43:38 <Nothing\> i had this stuff years and years ago called dream herb, it's supposed to increase dream recall and the number of dreams you have, you can either smoke it or make it into a tea, so i tried making it into a tea and HOLY CRAP it was hands down the most bitter thing i've ever tasted, even more so than pure alkaloids, it almost burned my tongue because it was so bitter and made me gag so i tried smoking it and somehow even the smoke was too bitter to handl
02:43:39 <Nothing\> e, i wound up just throwing the stuff out
02:43:47 <Nothing\> calea zacetechichi
02:46:19 <T3sl4> wow
02:47:51 <Nothing\> yeah it was just awful, worst plant i've ever tasted
02:48:02 <Nothing\> almost tasted caustic
04:05:56 Join: Guest|7007 ([email protected]) to #EEVblog
04:06:45 Quit: Guest|7007 ([email protected]) Quit: http://www.kiwiirc.com/ - A hand crafted IRC client
04:07:20 Join: rust_collector ([email protected]) to #EEVblog
04:10:10 <Nothing\> https://www.desmos.com/calculator/qlbdlxyrza
04:10:35 <Nothing\> what is theta supposed to represent here? i know it refers to an angle, but WHAT angle? it seems that some value is implied but i can't figure out what that value is
04:11:37 <Nothing\> oh, less than or equal to 12pi or greater than or equal to 0, i missed that
04:12:00 <Nothing\> these sorts of graphs always confuse me
04:37:05 Join: ThunderSqueak_ ([email protected]) to #EEVblog
04:39:54 Quit: ThunderSqueak ([email protected]) Ping timeout: 121 seconds
04:59:11 Join: narayan ([email protected]) to #EEVblog
05:00:00 Quit: Nothing\ ([email protected]) Quit: Leaving
05:14:38 Quit: ThunderSqueak_ ([email protected]) Quit: Leaving
06:09:45 Join: Guest|84969 ([email protected]) to #EEVblog
06:10:30 Part: Guest|84969 ([email protected]) from #EEVblog
06:31:08 <Halcyon> Ampera :)
06:31:13 <Ampera> hi Halcyon
06:31:19 * Halcyon rubs eyes
06:31:23 <Halcyon> I don't wanna go to work
06:31:27 * Ampera sneezes
06:31:32 <Ampera> today is pizza day
06:31:32 <Halcyon> Thanks
06:31:39 <Halcyon> There is a day for pizza?
06:31:44 <Ampera> yes, today is that day
06:31:48 <rust_collector> every day
06:31:51 <Halcyon> I like pizza
06:37:00 <Halcyon> Anyway I suppose I should go to work :(
06:37:02 <Halcyon> Laters
07:28:03 <narayan> Hello peeps
07:33:14 <DHess_US> Pizza day is only on days which end in "y".
08:40:54 Quit: AndrevS ([email protected]) Connection closed
08:46:34 <EEVBlog> New EEVBlog Tweet: NEW EEVblog Video! EEVblog #1236 - German Solar Freakin' Roadways! https://t.co/Mt5QQvns6G
08:48:01 <rust_collector> I bet the german version will fail much better
09:14:25 <DHess_US> When you damage it, rain reacts with the Zyclon-B under the transparent layer to kill everybody in the area.
09:14:54 <rust_collector> not a bad idea
09:22:08 <DHess_US> Watching Counterpoint. Twice as much J.K. Simmons means twice as good.
09:41:04 <Ampera> In terms of solar roadways, wouldn't a far more reasonable implementation be simply placing something that can cheaply turn heat into electricity under normal asphalt?
09:42:25 <Ampera> I'm not sure if Peltier effect devices can be scaled up cheaply, but even something like pipes and a passive pumping system to send that to such a device would be better for smaller implementations than using silicon based devices.
10:28:28 <DHess_US> That depends on having a cooling source. You can only extract energy from a difference in temperature.
10:28:58 <DHess_US> So yes, you can do that, but the efficiency is horribly low unless you have a fantastic heat sink.
10:29:36 <DHess_US> That's why practical thermal solar installations run at very high temperatures, as high as possible. If the road is not glowing red with heat, then it is not worthwhile.
10:30:43 <DHess_US> Dave was right in his video. If you want to use solar cells, then stick them on poles next to the highway oriented for maximum power. Or better yet, do something else.
10:31:10 <DHess_US> Like stick them on tilted roofs.
10:43:33 Join: Guest|13652 ([email protected]) to #EEVblog
10:43:54 <Guest|13652> hello, does anyone here understand hard disk platter technology?
10:44:29 <Guest|13652> i am trying to better understand what it looks like / how it works on an atomic / electromagnetic level but hard to find good resources / pictures etc
10:44:48 <Guest|13652> for how data is physically stored
11:01:34 <EEVBlog> New EEVBlog Tweet: RT @TubeTimeUS: pin broke off, no replacement part, so I fixed it. 😂 https://t.co/n7Wl5dpBpg
11:08:47 Quit: Guest|13652 ([email protected]) Quit: http://www.kiwiirc.com/ - A hand crafted IRC client
13:27:35 <EEVBlog> New EEVBlog Tweet: https://t.co/FRkrEDBsAr https://t.co/T8l6ponqfm
13:33:57 <Ampera> 'tis a shame he left, for I actually know a bit about that
13:37:40 <EEVBlog> New EEVBlog Tweet: ANNOUNCEMENT: I'll be adding a new intro to all videos: "Alexa, buy an EEVblog BM235 Multimeter" Anyone know a good American accent voice-over artist? https://t.co/YO9rD0JvUs
14:19:25 Join: ThunderSqueak ([email protected]) to #EEVblog
14:19:29 Mode: (by ChanOP) +o ThunderSqueak
14:19:30 <Ampera> hi ThunderSqueak
15:02:13 <steve30> hi
15:15:59 * T3sl4 hugs steve30
15:18:03 * steve30 curls up next to T3sl4 and meows
15:18:21 * T3sl4 puts out a saucer of coffee for steve30
15:19:32 <steve30> mmm, coffee :p
15:30:29 <EEVBlog> New EEVBlog Tweet: Archive photo of the day https://t.co/zm9XSkhOKU
15:52:00 Join: mph ([email protected]) to #EEVblog
15:52:50 Quit: Stiff ([email protected]) serviceshub.austnet.org excel.sa.au.austnet.org
15:52:50 Quit: mrpackethead ([email protected]) serviceshub.austnet.org excel.sa.au.austnet.org
15:55:07 Quit: ThunderSqueak ([email protected]) Quit: Leaving
16:08:22 <steve30> I've got to go and meet someone this morning
16:08:25 Join: Stiff ([email protected]) to #EEVblog
16:40:52 Quit: narayan ([email protected]) Ping timeout: 121 seconds
17:08:32 Quit: steve30 ([email protected]) Quit: <Baljem> steve30: by the way, I had the most bizarre dream the other day that someone came in here and seriously flipped their shit over your quit message and why aren't the ops /doing/ something about it
17:10:11 <EEVBlog> New EEVBlog Tweet: Crystal socket porn https://t.co/Epj8BAeq0Y
17:11:10 Join: Halcyon_ ([email protected]) to #EEVblog
17:12:27 Quit: Halcyon ([email protected]) Ping timeout: 121 seconds
17:15:13 <EEVBlog> New EEVBlog Tweet: #BringBackSolderIDtags https://t.co/jOPho0Qk29
17:40:23 <EEVBlog> New EEVBlog Tweet: Old school fuse porn, with spare! https://t.co/6BpA1ca2Pd
17:44:24 <EEVBlog> New EEVBlog Tweet: Any Portuguese fabs left? https://t.co/PwErHe7KoL
19:28:26 <K> hello
19:34:11 <EEVBlog> New EEVBlog Tweet: In case you haven't guessed, a vintage teardown video coming tomorrow
20:21:55 <DogWomble> Anyone up for a CAH game or two?
20:24:11 <Halcyon_> T3sl4, ?
20:38:01 Join: Guest|6473 ([email protected]) to #EEVblog
21:12:00 Quit: Guest|6473 ([email protected]) Quit: http://www.kiwiirc.com/ - A hand crafted IRC client
21:36:25 Join: steve30 ([email protected]) to #EEVblog
23:26:56 <DHess_US> https://i.imgur.com/xP0ke27.jpg
23:46:02 <K> bhh
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