Search found 5533 matches

by Xanthir
Tue Aug 07, 2018 6:29 pm UTC
Forum: Mathematics
Topic: A biology-related statistic math problem
Replies: 7
Views: 416

Re: A biology-related statistic math problem

Ah, you didn't list "can't degrade" in your first setup of the problem, so when you mentioned it later I thought you were just inaccurately glossing your previous constraints. So yeah, we're in intensely magical territory here, with a hyper-intelligence watching every mutation and modeling...
by Xanthir
Tue Aug 07, 2018 6:23 pm UTC
Forum: Science
Topic: Formal definition of genetic fitness
Replies: 8
Views: 277

Re: Formal definition of genetic fitness

Any tracking over multiple generations has to take into account the changing environment the genes find themselves in, which greatly complicates the idea of a stable "fitness" score you can assign cross-generationally. So it's not unreasonable to take the simple route and classify it in a ...
by Xanthir
Tue Aug 07, 2018 6:17 pm UTC
Forum: Mathematics
Topic: A biology-related statistic math problem
Replies: 7
Views: 416

Re: A biology-related statistic math problem

"Can't die" and "can't become cancer" do not combine into "all mutations are positive". Most mutations are negative, and even if they're somehow magically prevented from killing the cell, they can still disable it or otherwise make it work badly in various ways. So you'...
by Xanthir
Sun Aug 05, 2018 6:38 pm UTC
Forum: Fictional Science
Topic: Trying to construct an ideal future virtual society of dragons
Replies: 18
Views: 737

Re: Trying to construct an ideal future virtual society of dragons

The concept of a "far-future dragon society" apparently being a *thing* that a lot of people make variants of is clearly some norm from a community I've never touched on, so I'll leave that weirdness at arms-length. ^_^ Just some random bits, which are mostly me disagreeing with your moral...
by Xanthir
Wed Aug 01, 2018 5:56 pm UTC
Forum: Science
Topic: Miscellaneous Science Questions
Replies: 2870
Views: 632334

Re: Miscellaneous Science Questions

But a football cannon *could* launch it that far in a vacuum, theoretically. (Well, assuming that the football can stand up to the acceleration of the cannon. But imagine an arbitrarily-long football-railgun that can bring it to the desired velocity at an appropriately low acceleration.) But when yo...
by Xanthir
Tue Jul 31, 2018 4:30 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9853
Views: 1748536

Re: Coding: Fleeting Thoughts

Note that you *can* retrieve all the Symbols attached to an object ; they're not "hidden" in any way whatsoever, they're just guaranteed to never collide with anything else unless you specifically use the same Symbol object. So if you really do have some private data to associate, you can'...
by Xanthir
Fri Jul 20, 2018 5:49 pm UTC
Forum: Coding
Topic: Empty lines inside long code blocks
Replies: 2
Views: 295

Re: Empty lines inside long code blocks

Agreed, blank lines separating out sections is great.

Alternately and often better: separate into pieces, then factor those pieces out into separate functions.
by Xanthir
Mon Jul 09, 2018 3:33 am UTC
Forum: Science
Topic: Cooling gas by expansion
Replies: 17
Views: 1669

Re: Cooling gas by expansion

Heimhenge wrote:
It would be cool (no pun intended) if that temperature came out to 2.6 kelvin.

There's nothing special about the CMBR temperature; it's just how cool the CMBR happens to be at our current time. It was hotter in the past, it'll be cooler in the future.
by Xanthir
Sun Jul 08, 2018 3:47 am UTC
Forum: Gaming
Topic: Pokemon Go
Replies: 120
Views: 22852

Re: Pokemon Go

Oh, good point! In that case, 3119 1908 3927, with my stops generally being from California.
by Xanthir
Tue May 15, 2018 8:44 pm UTC
Forum: Gaming
Topic: Gaming fleeting thoughts
Replies: 672
Views: 103122

Re: Gaming fleeting thoughts

First, I respect your opinion, because we all experience games differently and have different opinions about them, and that's all valid.

Second, I'LL FITE U
by Xanthir
Wed May 09, 2018 6:20 pm UTC
Forum: Computer Science
Topic: Formally, What is P and NP?
Replies: 18
Views: 4238

Re: Formally, What is P and NP?

You can discuss whatever you want, man. Nobody's stopping you.
by Xanthir
Fri May 04, 2018 7:25 pm UTC
Forum: Computer Science
Topic: Formally, What is P and NP?
Replies: 18
Views: 4238

Re: Formally, What is P and NP?

Yes, if you can establish that the "P" set is definitely a proper subset of the "NP" set (or, conversely, that they're the same set), then you've solved the problem.
by Xanthir
Wed May 02, 2018 4:33 pm UTC
Forum: Computer Science
Topic: Formally, What is P and NP?
Replies: 18
Views: 4238

Re: Formally, What is P and NP?

What "really long statement"?
by Xanthir
Wed May 02, 2018 4:02 am UTC
Forum: Computer Science
Topic: Formally, What is P and NP?
Replies: 18
Views: 4238

Re: Formally, What is P and NP?

Yes, P by definition is a subset of NP; everything in NP is definitely in P. It's just that "subset" might mean "same set".
by Xanthir
Sun Apr 29, 2018 7:46 pm UTC
Forum: Computer Science
Topic: Formally, What is P and NP?
Replies: 18
Views: 4238

Re: Formally, What is P and NP?

Nah, your second definition is fine afaict. Only correction: For this discussion, "too much" means that if the original TM always runs in polytime, then the resulting TM will always run in polytime as well. This definition doesn't require the original TM to run in polytime, just that when ...
by Xanthir
Sun Apr 29, 2018 7:42 pm UTC
Forum: The Help Desk
Topic: Compressing video and photo or I lose my job
Replies: 7
Views: 1378

Re: Compressing video and photo or I lose my job

Or just move some of the videos to a temporary location on another computer, then requisition a larger hard drive (or a better archiving scheme that doesn't rely on a whole bunch of large files all living on a single computer). Problem solved, both in the moment and longer term.
by Xanthir
Sun Apr 29, 2018 7:39 pm UTC
Forum: Fictional Science
Topic: Self-Contained Pure Fiction about the Fine Structure Constant
Replies: 11
Views: 2066

Re: Self-Contained Pure Fiction about the Fine Structure Constant

Wow this OP started interesting and then went off the rails surprisingly fast. Everything from numerology to patriarchy to messages from aliens, wowsers. ↶ If you think I'm wrong, the universe is right there, mathematics is right there, prove it chumps. ↶ The experimentally determined value of the f...
by Xanthir
Wed Apr 25, 2018 2:44 am UTC
Forum: Computer Science
Topic: Desirable Coding Skills
Replies: 13
Views: 1662

Re: Desirable Coding Skills

You get its integral. ^_^ I can highly recommend 3Blue1Brown's Essence of Calculus series . Each video is short and approachable, and the whole series is only about 4 hours total. It'll give you a really nice intuitive appreciation of what calculus is, what it does, and how and why it's used. (Try t...
by Xanthir
Tue Apr 24, 2018 6:31 pm UTC
Forum: Computer Science
Topic: Analysis of the Java RNG
Replies: 4
Views: 1146

Re: Analysis of the Java RNG

Oh duh, yeah, sorry, was assuming that the output was the state. If the output is trimmed from the state, you can def have repeated outputs that still have unique state and thus different successors.
by Xanthir
Tue Apr 24, 2018 6:28 pm UTC
Forum: Mathematics
Topic: Curve Filling a Rectangle
Replies: 5
Views: 1630

Re: Curve Filling a Rectangle

aka what madako said, yeah. It's a trivial mapping.
by Xanthir
Mon Apr 23, 2018 9:48 pm UTC
Forum: Computer Science
Topic: Analysis of the Java RNG
Replies: 4
Views: 1146

Re: Analysis of the Java RNG

Tub wrote:
But it's extremely unlikely for every value to be picked exactly once.

And, due the way LCGs work, once you *do* repeat a value, you loop the sequence. Anything not hit before the first repeat will never be hit.
by Xanthir
Mon Apr 23, 2018 9:45 pm UTC
Forum: Computer Science
Topic: Desirable Coding Skills
Replies: 13
Views: 1662

Re: Desirable Coding Skills

On the Git note, I highly recommend A Plumber's Guide To Git for a solid introduction to what Git is "under the hood", which I've found immensely useful in using it (and unfucking my repos when I do something out of the ordinary).
by Xanthir
Sun Apr 22, 2018 6:26 pm UTC
Forum: Gaming
Topic: Games you can't remember the title of.
Replies: 1895
Views: 472457

Re: Games you can't remember the title of.

I also highly recommend playing the revised rules for the Great People expansion; it makes the game play out much better than the Echoes rules of "just shuffle some in" did.
by Xanthir
Sun Apr 22, 2018 6:19 pm UTC
Forum: Computer Science
Topic: Desirable Coding Skills
Replies: 13
Views: 1662

Re: Desirable Coding Skills

Useful skills for a job is: get decent at any programming language. "Popular" languages (Java, Python, JS) will give you a wide variety of places to go, less popular ones will restrict where you can work, but they'll appreciate you more. (Imo, C/C++ is a dead end, cut your losses and try a...
by Xanthir
Wed Apr 18, 2018 3:43 am UTC
Forum: Coding
Topic: An amateur has tried to build a website in raw HTML
Replies: 56
Views: 8050

Re: An amateur has tried to build a website in raw HTML

Blink forked from WebKit a few years back; they were the same engine before that. Android Browser "uses WebKit" because it hasn't been updated since before the fork; since then we've just shipped Chrome itself on Android.
by Xanthir
Sun Apr 15, 2018 3:19 am UTC
Forum: Coding
Topic: An amateur has tried to build a website in raw HTML
Replies: 56
Views: 8050

Re: An amateur has tried to build a website in raw HTML

The Android browser was just Chrome, occasionally forked and then fiddled with, so that by the time it was released in a new Android version it was several versions behind real Chrome, and thus was always missing whatever latest features had been added.
by Xanthir
Thu Apr 12, 2018 8:20 am UTC
Forum: Coding
Topic: An amateur has tried to build a website in raw HTML
Replies: 56
Views: 8050

Re: An amateur has tried to build a website in raw HTML

FlatAssembler wrote:
CSS doesn't support conical gradients, and neither does SVG.

Note that conic-gradient() is defined in Images 4, was cleared for shipping by the CSSWG, and is implemented in Chrome now (in nightlies).
by Xanthir
Sun Apr 08, 2018 10:27 am UTC
Forum: Books
Topic: Words of Radiance - Brandon Sanderson
Replies: 7
Views: 6642

Re: Words of Radiance - Brandon Sanderson

I also had to reread the two previous books to remember anything about what was going on. (And then the novella in Arcanum Unbound, since that was mentioned as useful reading in the preface...) ^_^ But it was worth it overall; I think I enjoyed the first two books much more this time around. Shallan...
by Xanthir
Fri Apr 06, 2018 4:03 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1975: "Right Click"
Replies: 42
Views: 12295

Re: 1975: "Right Click"

This is the Tudor House variation. Good luck!
by Xanthir
Fri Apr 06, 2018 2:49 am UTC
Forum: Coding
Topic: An amateur has tried to build a website in raw HTML
Replies: 56
Views: 8050

Re: An amateur has tried to build a website in raw HTML

↶ Putting it in the <head> has the advantage that the browser will load the scripts while it's busy parsing the rest of the page. This is not true - the location of your script has no effect on how it interacts with rest-of-page parsing. In fact, it was common advice to put your JS at the *bottom* ...
by Xanthir
Wed Mar 28, 2018 8:15 pm UTC
Forum: Fictional Science
Topic: Accidentally purifying the oceans
Replies: 10
Views: 1710

Re: Accidentally purifying the oceans

I expect the immediate mass-extinction in the oceans, and attendant rotting, would render the atmosphere completely unlivable for most land-based organisms, yeah. (And whatever water-based stuff survived the salinity change would asphyxiate due to the decomposition using up all the oxygen, so more m...
by Xanthir
Sun Mar 25, 2018 2:21 am UTC
Forum: The Help Desk
Topic: Backlinks to a specific page on a third party server
Replies: 3
Views: 2970

Re: Backlinks to a specific page on a third party server

In general, there is no way. Sometimes you can get lucky, and a Google search for the url will turn something up, but that's about all you can do as a third party.
by Xanthir
Thu Mar 15, 2018 11:09 pm UTC
Forum: Science
Topic: Delicious Martian Salt
Replies: 10
Views: 2082

Re: Delicious Martian Salt

Sure. I'm not up enough on geology to know if our preponderance of sodium chloride over other salts is an incidental or expected sort of outcome, tho.
by Xanthir
Thu Mar 15, 2018 8:13 pm UTC
Forum: Science
Topic: Delicious Martian Salt
Replies: 10
Views: 2082

Re: Delicious Martian Salt

Given that Mars once had seas, tho, presumably there are salt deposits somewhere, right? Iirc, the sea is salty due to weathering rocks producing either salts directly, or producing acids and bases which react to produce salts, and that salt just kinda hanging around and concentrating over the megay...
by Xanthir
Sun Mar 11, 2018 4:52 am UTC
Forum: The Help Desk
Topic: PyPI [resolved]
Replies: 8
Views: 2973

Re: PyPI [resolved]

I wrote myself a guide to how packages/modules work, and you might find it helpful too https://www.xanthir.com/b4pt0.
by Xanthir
Sat Mar 10, 2018 3:04 am UTC
Forum: Gaming
Topic: Board games anyone?
Replies: 914
Views: 208757

Re: Board games anyone?

@rmsgrey, no actual spoilers, but just in case you don't want *any* information about the thing you're talking about: We were really scared of it too and barely used it, having been burned by Season 1's "good stuff", but don't worry - it doesn't hurt. @zohar: I highly recommend...
by Xanthir
Thu Mar 01, 2018 10:28 pm UTC
Forum: Gaming
Topic: Board games anyone?
Replies: 914
Views: 208757

Re: Board games anyone?

Finished Pandemic Legacy S2 this last weekend. Some really lucky card drawing in November made it pretty easy - we got thru 3/4 of the goals in the first November game, so the second was a cakewalk. December, then, phew: We'd set things up for a quick exfiltration of the cure, with a supply cent...
by Xanthir
Thu Mar 01, 2018 10:11 pm UTC
Forum: Mathematics
Topic: Decitauths
Replies: 16
Views: 2712

Re: Decitauths

jewish_scientist was explicitly talking about the imperial system, in which 10 is not a used conversion ratio. That said, I don't know what the $10 vs $6 example is about, because 6/10 isn't a ratio you can express with inches and feet. Maybe trying to illustrate that 10 is a *bad* base to use? I du...
by Xanthir
Fri Feb 23, 2018 8:52 pm UTC
Forum: Fictional Science
Topic: Airlock full of water exposed to vacuum
Replies: 10
Views: 2286

Re: Airlock full of water exposed to vacuum

The vacuum temperature in Earth orbit is still super-freezing. We're just close-enough in that at equilibrium water will absorb enough solar radiation to stay liquid. (I think it also still has to be in a large enough body, but I don't know what that limit would be.) So it'll definitely still freeze...
by Xanthir
Wed Feb 21, 2018 10:52 pm UTC
Forum: Fictional Science
Topic: Airlock full of water exposed to vacuum
Replies: 10
Views: 2286

Re: Airlock full of water exposed to vacuum

Per this Medium post from a science-y person that seems credible , no, it's definitely not realistic. Water will boil immediately when exposed to the vacuum, and violently so, but it takes a bit to freeze (due to water's huge heat capacity). However, when it boils it goes immediately to vapor, which...

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