## Search found 256 matches

Tue Jan 12, 2016 4:25 pm UTC
Forum: Science
Topic: Gravity-temperature musings by Toffo
Replies: 162
Views: 28275

### Re: Gravity-temperature musings by Toffo

Toffo wrote:Ok now I thought about it some more, and now I'm equating those things again.

This is clearly wrong, as mass (or more correctly, mass-energy) is conserved, but the entropy of a system can increase (i.e. is not conserved).
Tue Jan 12, 2016 4:20 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9968
Views: 1953932

### Re: Coding: Fleeting Thoughts

I'm just bored at work and was reading the post about the programming language for the XKCD phone. It got me thinking, would it be possible to build an "RNG based" language, where, for example, there is a probability that your variables will shift one bit?. This is the way most modern com...
Wed Dec 30, 2015 7:31 pm UTC
Forum: Forum Games
Topic: Count Up with the Four Fours Puzzle
Replies: 2066
Views: 96856

### Re: Count Up with the Four Fours Puzzle

189 = (4!+(4!/.4))/.4...
Wed Dec 16, 2015 5:38 pm UTC
Forum: Forum Games
Topic: Count Up with the Four Fours Puzzle
Replies: 2066
Views: 96856

### Re: Count Up with the Four Fours Puzzle

87 = 4 * 4! - 4 / .4...
Wed Dec 16, 2015 4:10 pm UTC
Forum: Forum Games
Topic: Count Up with the Four Fours Puzzle
Replies: 2066
Views: 96856

### Re: Count Up with the Four Fours Puzzle

84 = √4 * 44 - 4
Wed Dec 09, 2015 2:28 pm UTC
Forum: Logic Puzzles
Topic: An annoying "riddle" I wanted to share
Replies: 12
Views: 7257

### Re: An annoying "riddle" I wanted to share

SPACKlick wrote:What is a word made up of four letters, yet is spelled with three. Although, it is written with eight letters, and then with four. Rarely, it consists of six letters but never is written with five.

Spoiler:
Yes, yes, they are. Maybe seeing it written down made it too easy.
Mon Dec 07, 2015 2:45 pm UTC
Forum: Science
Topic: Could we save the sun?
Replies: 18
Views: 3313

### Re: Could we save the sun?

The only way to save the sun is to remember that it's = it is.

Removing iron from the core won't do much because the sun will never produce iron, or many other heavy elements. It's not large enough. Maybe removing its core in the future could help.
Fri Dec 04, 2015 8:53 pm UTC
Forum: Science
Topic: Is 'control' a common property of all life?
Replies: 168
Views: 14715

### Re: Is 'control' a common property of all life?

I asked for an example of a behavior that isn't using feeback - what specific behavior in mate seeking is not operating on feedback principles? "Having" a brightly colored something is not a behavior. Oh, I can think of one. A male plant releases pollen and gets no feedback whether it suc...
Fri Dec 04, 2015 8:22 pm UTC
Forum: Science
Topic: Is 'control' a common property of all life?
Replies: 168
Views: 14715

### Re: Is 'control' a common property of all life?

Stimulus-response could occur in an open loop without feedback. I can't think of any biological examples where this would be the case, as usually an organism can sense some change that the response caused. I suppose I could contrive an example -- numb your arm and hand with a local anesthetic, then ...
Fri Dec 04, 2015 5:06 pm UTC
Forum: General
Topic: Has anyone tried xkcd 941? Does this film style have a name?
Replies: 6
Views: 4010

### Re: Has anyone tried xkcd 941? Does this film style have a n

But would it work? Yes, it works. When I took geology in college, we looked at still stereo images of mountains taken from a plane. When we viewed the images through a stereoscope, we could see the 3-d topology of the mountains in great detail. If you had cameras on the ground and pointed them up a...
Thu Dec 03, 2015 3:39 pm UTC
Forum: Coding
Topic: IDEs and the death of the command line interface
Replies: 25
Views: 8907

### IDEs and the death of the command line interface

Recently at work co-workers have been very impressed by my ability to type commands in the Linux command line interface to do my work. The first time this happened was after I quickly typed a correct tar command without looking anything up . I soon realized that this person was impressed that I was ...
Thu Dec 03, 2015 2:42 pm UTC
Forum: Science
Topic: Gravity-temperature musings by Toffo
Replies: 162
Views: 28275

### Re: Gravity-temperature musings by Toffo

Does the radiation not gain energy on it's way down, and does that not decrease the time to heat the pizza to appropriate temperature? No, photons do not gain energy as they're traveling towards a black hole. Energy is conserved. When an object falls, its potential energy is converted to kinetic en...
Wed Dec 02, 2015 7:46 pm UTC
Forum: Mathematics
Topic: hotel infinity and countably infinite
Replies: 31
Views: 5557

### Re: hotel infinity and countably infinite

Here's another way to think about the difference in size between the set of integers and the set of reals. Every subset of integers (finite or infinite) can be encoded in just one real number. Just assign a decimal place to each integer, and write a 1 in the decimal place if the integer is in the su...
Tue Nov 24, 2015 2:34 pm UTC
Forum: Coding
Replies: 3
Views: 3340

### Re: Very basic question about storing function results

memoization
Thu Nov 19, 2015 4:08 pm UTC
Forum: Forum Games
Topic: Operate on the Last Number!
Replies: 149
Views: 8867

### Re: Operate on the Last Number!

I take the average of the digits

5
Fri Nov 13, 2015 7:36 pm UTC
Topic: 1603: "Flashlights"
Replies: 64
Views: 18958

### Re: 1603: "Flashlights"

mojo12 wrote:I caught that too. I hope it's not an Americanism. I don't know why the 'real v really' issue annoys me so. And I don't get that "fake" kind of annoyed when I see it, I get real annoyed.

What annoys me is when people drive to slow. I mean real slow!
Mon Nov 09, 2015 7:42 pm UTC
Forum: Science
Topic: NASA reports net gain of Antarctic ice
Replies: 56
Views: 7526

### Re: NASA reports net gain of Antarctic ice

SDK wrote:How does the government benefit from carbon trading?

Whenever they talk about carbon trading, they're not talking about new t*xes. Watch my lips carefully -- talking about new t*xes is a sure way not to get re-elected.
Tue Nov 03, 2015 8:06 pm UTC
Forum: Books
Topic: "Programming" book for toddlers?
Replies: 3
Views: 6329

### Re: "Programming" book for toddlers?

commodorejohn wrote:So what's its stance on text editor preference?

It's obvious from the cover... Code::Blocks
Thu Oct 29, 2015 2:49 pm UTC
Forum: Science
Topic: Sun as final storage for radwaste?
Replies: 134
Views: 27068

### Re: Sun as final storage for radwaste?

That's a Jupiter slingshot to the Sun maneuver. We should just shoot radioactive waste into Jupiter directly. There's no solid surface, so the waste would fall into the center where the heat would melt everything and allow it to dilute through Jupiter's core. Jupiter must already have quite a few r...
Wed Oct 28, 2015 7:19 pm UTC
Forum: Forum Games
Topic: Operate on the Last Number!
Replies: 149
Views: 8867

### Re: Operate on the Last Number!

I take it to the 5/7 power.

243
Mon Oct 26, 2015 6:18 pm UTC
Forum: Coding
Topic: Coding: Fleeting Thoughts
Replies: 9968
Views: 1953932

### Re: Coding: Fleeting Thoughts

Does anyone know the paper/article about middle school children(?) answering a variable assignment question before and after being taught how it works and the kids basically either understood it from the start or didn't learn it at all? This is a common problem in teaching. Students often think the...
Thu Oct 15, 2015 8:51 pm UTC
Forum: Forum Games
Topic: Operate on the Last Number!
Replies: 149
Views: 8867

### Re: Operate on the Last Number!

I chop the serifs off.

|
Thu Oct 15, 2015 6:30 pm UTC
Forum: Mathematics
Topic: Little conjecture
Replies: 6
Views: 2050

### Re: Little conjecture

I think the reason it's hard to prove is that it is false.

For k = 7: p = 2^7-1 = 127, which is prime

127-1 = 126
127-2 = 125
127-4 = 123
127-8 = 119
127-16 = 111
127-32 = 95
127-64 = 63

None of these are prime. 119 = 7 * 17
Wed Oct 14, 2015 3:08 pm UTC
Forum: General
Topic: Lucky Ten Thousand (TIL)
Replies: 13421
Views: 1690797

### Re: Today I Learned

While I was reading this very thread, I realized that pushing on my mouse's wheel to the left takes me to the previous web page, and pushing to the right does the opposite. So that's what those little arrows next to the wheel are indicating! Also, TIL that Queen's Another One Bites the Dust is about...
Wed Oct 14, 2015 1:46 pm UTC
Forum: Mathematics
Topic: PID formula
Replies: 4
Views: 2263

### Re: PID formula

But I'm still a little unclear of why you'd replace i with tau.. Isn't tau defined as [;\tau=2\pi;]? There have been a few very vocal people who have recently tried to push for that idea, but that campaign hasn't gone anywhere that I'm aware of. If you open a math textbook and see tau, you can be n...
Tue Oct 13, 2015 1:56 pm UTC
Forum: General
Topic: Anyone else terrified by sudden death?
Replies: 36
Views: 9164

### Re: Anyone else terrified by sudden death?

Sabredog wrote:It's indescribably horrifying.

Seems fine to me. I'd rather go that way. A slow, agonizing death is what I'm terrified of. I'm not really afraid of death at all, but the suffering on the way there.
Tue Oct 13, 2015 1:49 pm UTC
Forum: Mathematics
Topic: PID formula
Replies: 4
Views: 2263

### Re: PID formula

Tau and some fancy curve ? You mean the integral for the integral term? I'm not going to explain integral calculus here. Just think of it as a sum of recent errors: I_f \sum_{i=t-N}^t e(i) To try to explain briefly, the sigma is replaced with the "fancy curve" and the i variable i...
Wed Oct 07, 2015 4:50 pm UTC
Forum: Computer Science
Topic: Coding and Chronic Pain Combo
Replies: 7
Views: 8039

### Re: Coding and Chronic Pain Combo

Including cannabis? You might want to try a mindfulness-based approach.
Fri Oct 02, 2015 9:09 pm UTC
Forum: General
Topic: I believe [robots] will be a bigger stride than agriculture.
Replies: 23
Views: 6571

### Re: I believe [robots] will be a bigger stride than agricult

First of all, intuition is often wrong. Exactly. That's why Dennett calls the Chinese Room argument a bad intuition pump. It pumps the wrong intuition to encourage the wrong conclusion. Second, just because Bucky said something does not give it credence. I certainly agree to that, too. If anyone ma...
Fri Oct 02, 2015 5:45 pm UTC
Forum: General
Topic: I believe [robots] will be a bigger stride than agriculture.
Replies: 23
Views: 6571

### Re: I believe this will be a bigger stride than agriculture.

It sounds like you took it as a supposed-to-be-plausible sci-fi story. I took it as a thought experiment and I enjoyed it. Of course it's not going to happen that way, but the story presented some ideas I hadn't thought of before in convenient story format. The writing was as you say but I was able...
Thu Oct 01, 2015 6:27 pm UTC
Forum: Mathematics
Topic: Composite numbers and polynomials
Replies: 9
Views: 2724

### Re: Composite numbers and polynomials

Here's how you can find the polynomial for the first five composites in Octave (linear algebra software). It just uses a formula from Wikipedia . octave:1> X = [ [1 1 1 1 1]; [1 2 4 8 16]; [1 3 9 27 81]; [1 4 16 64 256]; [1 5 25 125 625] ]; octave:2> y = [ 4; 6; 8; 9; 10 ]; octave:3> a = inv(X' * X)...
Thu Oct 01, 2015 5:26 pm UTC
Forum: Mathematics
Topic: Composite numbers and polynomials
Replies: 9
Views: 2724

### Re: Composite numbers and polynomials

1. Yes! Given any set of n points where no two points have the same x value, there is a polynomial of degree n-1 that goes through all the points. Therefore, there is a polynomial that goes through (1,4), (2,6), (3,8), (4,9), (5,10), and so on. Unfortunately, the polynomial has infinite degree. 2. I...
Sat Aug 15, 2015 1:17 pm UTC
Forum: General
Topic: I believe [robots] will be a bigger stride than agriculture.
Replies: 23
Views: 6571

### Re: I believe this will be a bigger stride than agriculture.

ucim wrote:
schapel wrote:Why should humans work to earn their living when they don't need to?
Why should the robots give the humans what they want?

Why wouldn't they? They do now.
Fri Aug 14, 2015 10:05 pm UTC
Forum: General
Topic: I believe [robots] will be a bigger stride than agriculture.
Replies: 23
Views: 6571

### Re: I believe this will be a bigger stride than agriculture.

I think the short story Manna covers the potential positive and negative effects of automating nearly all jobs. I agree that robots taking jobs away from humans isn't necessarily a disaster. It just requires rethinking how the economy works. Why should humans work to earn their living when they don'...
Mon Aug 03, 2015 11:04 pm UTC
Forum: Coding
Topic: Esoteric programming languages for an esoteric mind?
Replies: 77
Views: 16875

### Re: Esoteric programming languages for an esoteric mind?

I don't see you having a problem with syntax. When I asked you to do something simple and specific, get a line from System.in and output it to System.out, you had no problem at all that I can see, not even with syntax. You were unused to putting the package name before the class name, but I think th...
Mon Aug 03, 2015 10:48 am UTC
Forum: Coding
Topic: Esoteric programming languages for an esoteric mind?
Replies: 77
Views: 16875

### Re: Esoteric programming languages for an esoteric mind?

I'm not sure what you mean by that. On the one hand, the libraries contain the code that is needed for some code to work in the program file... Ah, this is the first inaccurate mental model we've found. You do not need to use import to use the libraries. What the import statement does is allow you ...
Mon Aug 03, 2015 2:56 am UTC
Forum: The Help Desk
Topic: Clarify Linux account expiration/deactivation/disabling?
Replies: 1
Views: 2510

### Re: Clarify Linux account expiration/deactivation/disabling?

The Wikipedia article passwd explains quite a lot. More generally, you'll want to understand the format of the /etc/passwd and /etc/shadow files. Accounts are separate from files -- if you delete an account, all of the files owned by that account are left untouched, but ls -l will show the UID of th...
Sun Aug 02, 2015 9:54 pm UTC
Forum: Language/Linguistics
Topic: Words before their meanings were changed by pop culture
Replies: 16
Views: 8603

### Re: Words before their meanings were changed by pop culture

Awesome!
Sun Aug 02, 2015 8:26 pm UTC
Forum: Coding
Topic: Esoteric programming languages for an esoteric mind?
Replies: 77
Views: 16875

### Re: Esoteric programming languages for an esoteric mind?

I suppose, for now, I could post my final project... I suspect that this code is far beyond where you first got confused, if you had no idea what to do and just started typing import statements. It sounds like you were completely lost at that point. Could you back up to where you first had trouble?...
Sun Aug 02, 2015 6:56 pm UTC