Search found 2946 matches

by SpitValve
Mon Jun 19, 2017 12:18 pm UTC
Forum: Mathematics
Topic: Magnetohydrodynamics
Replies: 3
Views: 799

Re: Magnetohydrodynamics

Unfortunately, I don't think he really checks in on the forum anymore - you'd have to tweet or email him or something.
by SpitValve
Mon Jun 19, 2017 10:17 am UTC
Forum: Mathematics
Topic: Magnetohydrodynamics
Replies: 3
Views: 799

Re: Magnetohydrodynamics

I like that you created an account for the sole purpose of posting this joke. It shows dedication.
by SpitValve
Mon Jun 05, 2017 9:46 am UTC
Forum: Coding
Topic: Neighbors of a cluster: What is this called?
Replies: 8
Views: 1622

Re: Neighbors of a cluster: What is this called?

If you just need accuracy within say 5–10%, you can do even better by using α·max + β·min, which lets you replace squaring with multiplication by a constant, and smart choices for the constants let you replace those multiplies by a few shifts and adds. Somewhere I have a spreadsheet in which I calc...
by SpitValve
Fri Jun 02, 2017 8:30 am UTC
Forum: Coding
Topic: Neighbors of a cluster: What is this called?
Replies: 8
Views: 1622

Re: Neighbors of a cluster: What is this called?

Alternately, you could look at Friend of Friend algorithms. This is what we use in astrophysics to e.g. find galaxies in a cosmological simulation of particles.
by SpitValve
Fri Jun 02, 2017 8:24 am UTC
Forum: Coding
Topic: Neighbors of a cluster: What is this called?
Replies: 8
Views: 1622

Re: Neighbors of a cluster: What is this called?

Random thoughts: - Bin your points into a 3D grid where each cell is a cube with sides of length R/sqrt(3). For every particle in B, mark the cell it's inside, and make a list of all the particles from B in each cell. For each particle from A, calculate what cell it's in. If a particle from A is wit...
by SpitValve
Wed May 24, 2017 3:53 pm UTC
Forum: Science
Topic: Bad science jokes!
Replies: 96
Views: 26238

Re: Bad science jokes!

I'm surprised there aren't more jokes about gravity. It seems like a field with a lot of potential.
by SpitValve
Fri Mar 31, 2017 4:10 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 12321

Re: 1818: "Rayleigh Scattering"

It's not about people asking why colors happen, which is certainly a good kind of question! It's about how many people have this specific cliche as their programmed response to the question of why the sky is blue, often and misleadingly to the exclusion of saying that "air is blue", as if...
by SpitValve
Fri Mar 31, 2017 3:08 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1818: "Rayleigh Scattering"
Replies: 99
Views: 12321

Re: 1818: "Rayleigh Scattering"

I am jealous of Randall's ability to be insightful about things that I feel I should have already known.
by SpitValve
Tue May 24, 2016 7:51 pm UTC
Forum: What If?
Topic: What-If 0150: "Tatooine Rainbow"
Replies: 52
Views: 24032

Re: What-If 0150: "Tatooine Rainbow"

In the literature, orbiting one star is an "s-type" (for "satellite-type") orbit, while orbiting both stars is a "p-type" (for "planetary-type") orbit. So a circumbinary planet is a p-type planet, while the other type is an s-type planet. But that's maybe a li...
by SpitValve
Wed May 04, 2016 2:08 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1676: "Full-Width Justification"
Replies: 64
Views: 11313

Re: 1676: "Full-Width Justification"

Snakes are the best option. Those medieval illuminated manuscripts had the right idea.
by SpitValve
Wed Nov 25, 2015 2:33 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1608: "Hoverboard"
Replies: 140
Views: 57714

Re: 1608: "Hoverboard"

It's been a long time since high school Latin class, but this does not look write at all to me :P

Image
by SpitValve
Mon Apr 13, 2015 1:50 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1511: "Spice Girl
Replies: 70
Views: 11203

Re: 1511: "Spice Girl

PayasYouDraw wrote:Is this the Great Girlband War?

I'd be on Girls Aloud's side.


Korea would kick arse in this war, by sheer numbers alone. Some of them even get machine-guns: https://www.youtube.com/watch?v=j7_lSP8Vc3o&feature=youtu.be&t=190
by SpitValve
Mon Mar 30, 2015 3:47 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1505: "Ontological Argument"
Replies: 278
Views: 28518

Re: 1505: "Ontological Argument"

You can find flaws in the ontological argument, but it's not as trivial as so many people here are making it. The idea of "greatness" has a specific meaning here - it's the idea of ontological greatness. It's about degrees of how "existy" something is. Something that exists is on...
by SpitValve
Mon Mar 16, 2015 2:13 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1499: "Arbitrage"
Replies: 164
Views: 18321

Re: 1499: "Arbitrage"

The one place I've seen people actually take advantage of this sort of system was in Costco in Korea. People would try to make an entire meal out of the free relish, ketchup, and mustard, combining it together into a weird stew. I saw a lady just bring a plastic bag up to the relish dispenser and ju...
by SpitValve
Wed Feb 25, 2015 1:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1491: "Stories of the Past and Future"
Replies: 99
Views: 27550

Re: 1491: "Stories of the Past and Future"

I find The Three Musketeers and The Count of Monte Cristo are interesting examples of this. Both are were completed in the 1840s by Alexandre Dumas, but The Three Musketeers is in a historical setting (1620s), while The Count of Monte Cristo is basically in a contemporary setting (1815-1839). So in ...
by SpitValve
Fri Feb 20, 2015 8:33 pm UTC
Forum: What If?
Topic: What-If 0130: "Snow Removal"
Replies: 51
Views: 16648

Re: What-If 0130: "Snow Removal"

Randall's example here is pretty silly. His car is trying to melt 20 cubic metres of snow every second. Of course that's going to come out huge, he's made a frigging death ray. The problem is not really that snow takes a huge amount of energy to melt (although it does take a good bit), it's that he'...
by SpitValve
Wed Jan 28, 2015 4:09 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1479: "Troubleshooting"
Replies: 53
Views: 12008

Re: 1479: "Troubleshooting"

He's basically talking about this issue: http://www.hanselman.com/blog/EverythingsBrokenAndNobodysUpset.aspx.

Our life is full of complex programs that don't quite work, and we have to memorise all these weird arcane tricks to get things to do what they're supposed to.
by SpitValve
Mon Nov 24, 2014 12:36 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1451: "Background Screens"
Replies: 68
Views: 14020

Re: 1451: "Background Screens"

Here's some code from the Replicators from Stargate: http://img.thedailywtf.com/images/200803/Screenshot1.jpg I guess they must use Node.js. (They don't. Seriously that code has nothing to do with Replicators whatsoever. Someone must have said "we need some code for the screen, make it look te...
by SpitValve
Mon Apr 09, 2012 11:45 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1040: "Lakes and Oceans"
Replies: 164
Views: 56125

Re: 1040: "Lakes and Oceans"

The giant squid are real - there's one of them in Te Papa museum in NZ. They die from the pressure change when you drag them up to the surface :/

http://en.wikipedia.org/wiki/Giant_squid#First_observations_in_the_wild
by SpitValve
Wed Mar 28, 2012 10:51 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1035: “Cadbury Eggs”
Replies: 116
Views: 27029

Re: 1035: “Cadbury Eggs”

Holy crap, I had been wondering why Canadian Cadbury Eggs weren't as nice as New Zealand ones! I guess I just figured that the centres went hard if you left them for too long. This does not make me a clever man.
by SpitValve
Mon Jun 27, 2011 9:57 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0917: "Hofstadter"
Replies: 127
Views: 54118

Re: 0917: "Hofstadter"

I was like "InterStellar Medium Estimated Time of Arrival!? What does that have to do with anything?"
by SpitValve
Thu Oct 21, 2010 6:16 pm UTC
Forum: The Help Desk
Topic: Indirect login with Textwrangler
Replies: 5
Views: 1184

Re: Indirect login with Textwrangler

Thanks! That may actually work, though currently I'm getting:

"channel 3: open failed: administratively prohibited: open failed"

so I may have to have a chat with the admin... Now that I know the direction to look in, I should be able to figure something out. Thanks again :)
by SpitValve
Thu Oct 14, 2010 6:13 pm UTC
Forum: The Help Desk
Topic: Indirect login with Textwrangler
Replies: 5
Views: 1184

Re: Indirect login with Textwrangler

erm, maybe? I'll have to look up what port-forwarding is first :)
by SpitValve
Fri Sep 17, 2010 4:10 pm UTC
Forum: The Help Desk
Topic: Indirect login with Textwrangler
Replies: 5
Views: 1184

Indirect login with Textwrangler

Hi guys, haven't been here in a while, but there's something I can't figure out how to do and I was hoping someone could give me some clues... So to somewhat increase the security of the server I work on, it can only be ssh-ed into from another computer on my department network. So if I'm in my offi...
by SpitValve
Mon Sep 13, 2010 3:36 pm UTC
Forum: Science
Topic: Predictive ability of Theory of Everything
Replies: 23
Views: 2838

Re: Predictive ability of Theory of Everything

Knowing all the rules is quite a jump from being able to predict every outcome. We have a "theory of everything" for chess - there are only a finite number of combinations, and we know where every piece can move at every turn. Yet the computational power to calculate these possibilites is ...
by SpitValve
Tue Sep 08, 2009 8:57 pm UTC
Forum: Coding
Topic: Play a tune in Python/C/Fortran/etc
Replies: 1
Views: 525

Play a tune in Python/C/Fortran/etc

Hi all, Anyone know of a good script or library or whatever that let's me play a certain note of my choice? Say, "play 500" for 500 Hz or "beep 'E4'" to play an E note... I'm just looking for something that is either a command-line thing, or something callable from C or Fortran o...
by SpitValve
Thu Jul 09, 2009 2:33 pm UTC
Forum: Science
Topic: Does the width of a superconducting wire matter?
Replies: 15
Views: 1662

Re: Does the width of a superconducting wire matter?

Tass wrote:Remember that all current in a superconductor runs on the surface, that may intuitively explain why flat ribbons are good.


I thought it was because the most useful superconductors are made from brittle ceramics, and it's easier to grow them in layers than to mould them into wires...
by SpitValve
Fri Jul 03, 2009 12:51 pm UTC
Forum: Language/Linguistics
Topic: Recordings of Your Accent/Oral survey
Replies: 91
Views: 11343

Re: Recordings of Your Accent/Oral survey

Hurduser wrote:Judging my accent, where would you think I was from?


I would have guessed German, I'm afraid :) You guys travel enough that we definitely get used to hearing that accent...

I might just hear some of the Russian in there, but it might just be my imagination.
by SpitValve
Fri Jul 03, 2009 12:40 pm UTC
Forum: Science
Topic: Facepalm TV / Doing It Wrong
Replies: 553
Views: 49072

Re: Facepalm TV

Edit: I wish Iron Man had included an inertial compensator layer in the suit, because that would have been awesome. There would have been goo and bodysuits and suchlike. I'm pretty sure in the Ultimate line he's seen with goo and fluid on him as he exits a suit, I can't remember whether it's some s...
by SpitValve
Wed Jul 01, 2009 1:05 am UTC
Forum: Language/Linguistics
Topic: Recordings of Your Accent/Oral survey
Replies: 91
Views: 11343

Re: Recordings of Your Accent/Oral survey

Asmodieus wrote:I dont really know if I have an accent or not, I sound pretty much like everyone else on xbox live.


I find it a little odd that people say "I have no accent" instead of "I have a generic North American accent"...
by SpitValve
Tue Jun 30, 2009 12:49 pm UTC
Forum: Science
Topic: Isn't everything a black hole?
Replies: 32
Views: 1717

Re: Isn't everything a black hole?

Something for you to puzzle out: The Schwarzschild radius is given by: R=2*G*M/c^2 so R is proportional to M. The schwarzschild radius of an object is proportional to the mass of that object. Now, on very large scales, the universe has roughly constant density. So if we take a sphere of radius R cen...
by SpitValve
Mon Jun 29, 2009 3:38 pm UTC
Forum: Science
Topic: On the topic of ringworlds.
Replies: 32
Views: 3294

Re: On the topic of ringworlds.

Edit: Actually, forget that. Can you tell me the mass of a yellow G-star very much like our sun with a louminocity of two and a half solar units? A reasonable guess that doen't deviate too much from the normals is accepted too... http://ceres.hsc.edu/homepages/classes/astronomy/spring99/Mathematics...
by SpitValve
Thu Jun 25, 2009 1:46 pm UTC
Forum: Science
Topic: If black holes are at the center of spiral galaxies...
Replies: 29
Views: 1815

Re: If black holes are at the center of spiral galaxies...

I know people who work on accretion discs, I could ask them :) Also, we did a bit on supermassive blackhole accretion discs in our extragalactic course... So: no, I don't think time dilation is important. It's just that you have to get rid of a lot of kinetic energy to get something that's in a rap...
by SpitValve
Thu Jun 25, 2009 9:52 am UTC
Forum: Science
Topic: If black holes are at the center of spiral galaxies...
Replies: 29
Views: 1815

Re: If black holes are at the center of spiral galaxies...

I know people who work on accretion discs, I could ask them :) Also, we did a bit on supermassive blackhole accretion discs in our extragalactic course... So: no, I don't think time dilation is important. It's just that you have to get rid of a lot of kinetic energy to get something that's in a rapi...
by SpitValve
Wed Jun 24, 2009 5:28 pm UTC
Forum: Language/Linguistics
Topic: Accidental Offense: Misunderstandings Through Dialect
Replies: 41
Views: 4666

Re: Accidental Offense: Misunderstandings Through Dialect

Alexius wrote:UK chips are US fries, US chips are UK crisps.


In North America there are chips and fries.
In the UK there are crisps and chips.
In New Zealand there are chips and chips.

Yeah, we like to be ambiguous...
by SpitValve
Wed Jun 24, 2009 11:43 am UTC
Forum: Science
Topic: How much does your high school cover in the sciences?
Replies: 21
Views: 1716

Re: How much does your high school cover in the sciences?

As to your linear algebra example, was that a simultaneous equation? We covered that briefly a few years ago but never got to use it. Usually in simultaneous equations we only deal with 2 variables at most. I asked my teacher today if we had a linear algebra topic and he said that it was covered in...
by SpitValve
Tue Jun 23, 2009 11:48 am UTC
Forum: Science
Topic: How much does your high school cover in the sciences?
Replies: 21
Views: 1716

Re: How much does your high school cover in the sciences?

There's a Calc course in NCEA, I am 90% sure there is no linear algebra. Calc course covers.. um. Complex Numbers; Trigonetric Modelling and Identities; Integration; Differentiation; and Conic Sections. I'm still half way through the course so I can't really say how detailed they go in, but you cou...
by SpitValve
Tue Jun 23, 2009 10:31 am UTC
Forum: Science
Topic: How much does your high school cover in the sciences?
Replies: 21
Views: 1716

Re: How much does your high school cover in the sciences?

Not really science, but do people do calculus and linear algebra in high school? I don't have my bursary (old exams for last year of high school in NZ) exams with me, but we got up to (at least) integration by substitution, solids of rotation, imaginary numbers (but not any real applications), and s...
by SpitValve
Tue Jun 23, 2009 10:23 am UTC
Forum: Science
Topic: Facepalm TV / Doing It Wrong
Replies: 553
Views: 49072

Re: Facepalm TV

The true cause of facepalm-TV (at least the physics variety) though is often bad technobabble. Have you seen Solaris? While it doesn't sound toooo bad to say "the visitors are made of subatomic particles stabilised by a Higgs field", the conversation where they manage to guess this (corre...
by SpitValve
Mon Jun 22, 2009 12:30 pm UTC
Forum: Science
Topic: What's the deal with airline food?
Replies: 15
Views: 4731

Re: What's the deal with airline food?

I don't think this is really "science" related anymore... but anyway: I generally find aeroplane food to be pretty alright actually, from my experience of Qantas and Air NZ flights across the pacific. It never blows me away, but it's definitely better than the campus staff cafeteria. (I do...

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