Search found 975 matches

by masher
Mon Oct 04, 2010 3:15 am UTC
Forum: Forum Games
Topic: Count up in Base 110
Replies: 885
Views: 120199

Re: Count up in Base 110

M
by masher
Sun Oct 03, 2010 11:48 pm UTC
Forum: General
Topic: Birthday Chemical Elements
Replies: 8
Views: 1781

Re: Birthday Chemical Elements

I wouldn't call titanium "exotic"...
You could get some raw metal from somewhere like Goodfellow, or you could get something from here.
by masher
Mon Sep 27, 2010 4:56 am UTC
Forum: Religious Wars
Topic: Parentheses
Replies: 26
Views: 6786

Re: Parentheses

phlip wrote:Maybe it's because I'm all headachey and not thinking straight, but did anyone else spend some time trying to figure out what was special with the parentheses in the OP before realising they were actually talking about the braces?


No.
by masher
Mon Sep 27, 2010 2:28 am UTC
Forum: Science
Topic: Cross correlation
Replies: 2
Views: 674

Cross correlation

Hi all I want to do a cross-correlation on two datasets to find the angle offset required for maximum correlation. The datasets look like this: index angle intensity 1 10.00 1000 2 10.05 1125 3 10.10 1235 4 10.15 1325 5 10.30 1234 6 10.35 1325 7 10.40 1256 ... 20000 1200.05 1356 index angle intensit...
by masher
Wed Sep 22, 2010 9:59 pm UTC
Forum: News & Articles
Topic: Sir Terry Pratchett and his sword
Replies: 16
Views: 2318

Re: Sir Terry Pratchett and his sword

A pic of the sword is here: http://www.paulkidby.com/news/apr2010.html
by masher
Sat Sep 18, 2010 9:08 pm UTC
Forum: Hardware
Topic: SATA 6 Gb/s vs 3 Gb/s compatability? [ANSWERED]
Replies: 2
Views: 1923

Re: SATA 6 Gb/s vs 3 Gb/s compatability

Nice.

Ta muchly!
by masher
Fri Sep 17, 2010 11:01 pm UTC
Forum: Hardware
Topic: SATA 6 Gb/s vs 3 Gb/s compatability? [ANSWERED]
Replies: 2
Views: 1923

SATA 6 Gb/s vs 3 Gb/s compatability? [ANSWERED]

Hi all

I'm looking at a new motherboard. It has 6x 6Gb/s SATA connectors, however, I'm only going to be using 3 Gb/s drives.

Is this going to work?
by masher
Tue Sep 07, 2010 6:07 am UTC
Forum: General
Topic: A fun game you can play in any college library
Replies: 17
Views: 2829

Re: A fun game you can play in any college library

I'm assuming you're talking PhD here....
by masher
Thu Aug 26, 2010 2:24 am UTC
Forum: Serious Business
Topic: Australian Federal Election 2010
Replies: 170
Views: 18622

Re: Australian Federal Election 2010

I don't get that people don't know how "preferences" are distributed. Yes, the media go on about how Labor's preferences will go to the Greens and such, but they really depend on how each individual voter marks their ballot. I you voted below the line on the senate ballot, then you said wh...
by masher
Tue Aug 24, 2010 3:51 am UTC
Forum: Computer Science
Topic: Ackermann Function
Replies: 7
Views: 2845

Re: Ackermann Function

I don't know about "best" but this is what I use... //assuming nice inputs: ie m,n >= 0public long ackermann(long m, long n){    if(m == 0)        return n+1;    else if(n == 0) //&& m > 0        return ackermann(m-1, 1);    else // n > 0 && m > 0        return ackermann(m-...
by masher
Mon Aug 23, 2010 4:45 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0783: "I Don't Want Directions"
Replies: 193
Views: 38787

Re: "I Don't Want Directions" discussion (#783)

jakerman999 wrote:
Eebster the Great wrote:
jakerman999 wrote:
Click is slang for kilometers per hour.

That must be a Canadian thing. I can't find it online, anyway.



I think it's limited to southern Ontario actually.


We use it in Australia...
by masher
Wed Aug 18, 2010 5:24 am UTC
Forum: Mathematics
Topic: Alternative piecewise notation?
Replies: 2
Views: 575

Re: Alternative piecewise notation?

Roger. I can work with that. My actual example is a little more complex, but I can make it work.... :)
by masher
Tue Aug 17, 2010 11:06 pm UTC
Forum: Mathematics
Topic: Alternative piecewise notation?
Replies: 2
Views: 575

Alternative piecewise notation?

I have an equation y_j = h_{j-2} x_{j-1} + h_j x_{j+1} where j can range from 1 to N , and h_j and x_j are tabulated values. As you can see, if I just put in values of j , I'll try and access values of h and x that don't exist. Is there an accepted shorthand notation to express that the equation sho...
by masher
Tue Aug 17, 2010 1:36 am UTC
Forum: Mathematics
Topic: improve upon the age/2+7 rule of creepynes
Replies: 51
Views: 8046

Re: improve upon the age/2+7 rule of creepynes

thc wrote:said stuff

Image
by masher
Mon Aug 16, 2010 4:51 am UTC
Forum: Serious Business
Topic: Australian Federal Election 2010
Replies: 170
Views: 18622

Re: Australian Federal Election 2010

I don't know if it's been mentioned, but I've just gone through https://www.belowtheline.org.au/ and had a go at doing my Senate vote.

Essentially, I ended up getting the Greens "how to vote" bit and twerking it a little.
by masher
Mon Jul 19, 2010 5:48 am UTC
Forum: General
Topic: What XKCD Summarizes the rest?
Replies: 12
Views: 1825

Re: What XKCD Summarizes the rest?

Aaeriele wrote:Pretty much would have to be this one, I think

(Alt text: "I love the title-text!")



http://www.youtube.com/v/DHoDsZDMH_Y
by masher
Wed Jul 14, 2010 11:52 am UTC
Forum: Serious Business
Topic: Australian Federal Election 2010
Replies: 170
Views: 18622

Re: Australian Federal Election 2010

cj-maranup wrote:I'm registered in Wilson Tuckey's electorate, he's going last, but will probably win anyway :(


I don't envy you!
by masher
Wed Jul 14, 2010 5:47 am UTC
Forum: Mathematics
Topic: Getting Published
Replies: 2
Views: 587

Re: Getting Published

Journal of Mathematics Teacher Education?

Is there a (mathematics) teachers association? Do they have a newsletter?
by masher
Wed Jul 14, 2010 5:27 am UTC
Forum: Science
Topic: Hooke's Law - explaining an unexpected finding
Replies: 18
Views: 6812

Re: Hooke's Law - explaining an unexpected finding

I think it'd be surprising, though, in a completely random grabbing of the rubber bands from a common packet if *all four* independent groups just happened to pick two rubber bands, one almost exactly twice as strong as the other, *and* use the stronger one only in the second test. ;) Yeah, that wa...
by masher
Wed Jul 14, 2010 4:38 am UTC
Forum: Science
Topic: Hooke's Law - explaining an unexpected finding
Replies: 18
Views: 6812

Re: Hooke's Law - explaining an unexpected finding

Rubber bands arent hookean, afaik. For instance, compressing a rubber band does nothing. What about a spring where all the coils are touching? You can't compress that unless you actually compress the substance that makes up a spring. You can still expand it though... . @OP, Did you test each rubber...
by masher
Wed Jul 14, 2010 4:23 am UTC
Forum: Coding
Topic: coworker rants
Replies: 92
Views: 14381

Re: coworker rants

or, if you're going to let in an animated smiley, then why not go all out?

Image
by masher
Mon Jul 12, 2010 2:29 am UTC
Forum: Mathematics
Topic: How do I differentiate a summation?
Replies: 1
Views: 1937

Re: How do I differentiate a summation?

I think I've solved it; the paper was wronger than I thought and that put me off my stride... Given the summation: \begin{align} y''_{i+1} = & \sum^N_{j=3} h^{-1}_{i,j-2} \frac{y_{j}}{x_{j}-x_{j-1}} \\ & - \sum^{N-1}_{j=2} h^{-1}_{i,j-1} y_j \left ( \frac{1}{x_{j+1}-x_{j}} + \fra...
by masher
Sat Jul 10, 2010 10:49 am UTC
Forum: Mathematics
Topic: How do I differentiate a summation?
Replies: 1
Views: 1937

How do I differentiate a summation?

Hi all I'm going through a paper and I think there are several typos in the maths. In one step they differentiate a sum which is defined as (all variables are tabulated values): y''_{i+1} = \sum^{N-2}_{j=1} h^{-1}_{i,j} \left ( \frac{y_{j+2}-y_{j+1}}{x_{j+2}-x_{j+1}} - \frac{y_{j+1}-y_{j...
by masher
Wed Jul 07, 2010 6:28 am UTC
Forum: Individual XKCD Comic Threads
Topic: 0763: "Workaround"
Replies: 166
Views: 40996

Re: "Workaround" discussion

I heard a story about a secretary that kept everything on her computer in "New Folder (n)". New folders inside new folders.

She then had a notebook (a physical paper one) that she kept notes in on which folder each file was in.

Then she lost the notebook.
by masher
Wed Jun 23, 2010 11:51 pm UTC
Forum: Mathematics
Topic: PhD Woooooooooo
Replies: 23
Views: 3820

Re: PhD Woooooooooo

It's a good feeling, isn't it?
by masher
Thu Jun 17, 2010 10:33 am UTC
Forum: Science
Topic: Capillary action
Replies: 24
Views: 3633

Re: Capillary action

I'm assuming that surface tension would stop it leaving the tube.
by masher
Tue Jun 15, 2010 5:19 am UTC
Forum: Computer Science
Topic: Quines
Replies: 29
Views: 7218

Re: Quines

Note that programs that take input are not considered quines. This would allow the source code to be fed to the program via keyboard input, opening the source file of the program, and similar mechanisms. Also, a quine that contains no code is ruled out as trivial; in many programming languages exec...
by masher
Wed Jun 02, 2010 6:03 am UTC
Forum: School
Topic: Grade my Introduction Paragraph
Replies: 11
Views: 1999

Re: Grade my Introduction Paragraph

Why can't you just post the paragraph?
by masher
Tue Jun 01, 2010 4:00 am UTC
Forum: Science
Topic: Science Conferences
Replies: 12
Views: 1704

Re: Science Conferences

I'm going to be at the Denver X-Ray Conference...
by masher
Fri May 28, 2010 4:01 am UTC
Forum: News & Articles
Topic: Hawaii dems hand GOP senate seat on a silver p...
Replies: 17
Views: 3101

Re: Hawaii dems hand GOP senate seat on a silver p...

Sounds like you need a preferential voting system....
by masher
Wed May 26, 2010 11:25 pm UTC
Forum: Science
Topic: What have you broken in the lab?
Replies: 48
Views: 7391

Re: What have you broken in the lab?

I've managed to blow up a high voltage power supply for an x-ray generator.

Good thing we had a service contract!
by masher
Tue May 25, 2010 3:13 am UTC
Forum: Language/Linguistics
Topic: 90's or 90s?
Replies: 113
Views: 42122

Re: 90's or 90s?

My favorite apostrophic faux-pas are the mailboxes that say "The Williams's." I always ask myself, "The Williams's what? House? Dog? Do they only own that sign?" It should be Williamses. No apostrophe since it's plural, not possessive. I read that as meaning "This is the ma...
by masher
Tue May 04, 2010 9:37 pm UTC
Forum: The Help Desk
Topic: Ubuntu Terminal
Replies: 2
Views: 671

Re: Ubuntu Terminal

Have a look for/at ~/.bash_history
by masher
Fri Apr 30, 2010 12:59 am UTC
Forum: Science
Topic: Deconvolving line profiles
Replies: 4
Views: 554

Re: Deconvolving line profiles

Just tried out some algorithms in qtiplot. They don't work due to the noise in the data.

I'm currently going through the paper trying to remember my matrix mathematics.... :cry:
by masher
Thu Apr 29, 2010 11:46 pm UTC
Forum: Mathematics
Topic: Margin of error when the sample percentage is zero?
Replies: 17
Views: 1756

Re: Margin of error when the sample percentage is zero?

Dason wrote:Ah, gotcha.

What we have here is a good ol' misunderstanding.


roger. :)
by masher
Thu Apr 29, 2010 11:36 pm UTC
Forum: General
Topic: Making my own Dry-Erase Board
Replies: 31
Views: 4465

Re: Making my own Dry-Erase Board

If I were making a whiteboard, I'd ask for 3 mm MDF sheet with a melamine coating.

But then again, I'm in Australia, and I'm assuming you're in the US.
by masher
Thu Apr 29, 2010 5:20 am UTC
Forum: General
Topic: Making my own Dry-Erase Board
Replies: 31
Views: 4465

Re: Making my own Dry-Erase Board

frezik wrote:What you want is melamine board. That's what regular dry erase boards are made of, except without the huge markup. It's often used to make quick-fab bathroom showers, so you should be able to find it at a hardware store.


This.
by masher
Thu Apr 29, 2010 5:14 am UTC
Forum: Science
Topic: Deconvolving line profiles
Replies: 4
Views: 554

Re: Deconvolving line profiles

I've found this paper that deals with the deconvolution of a measured signal, now I just need to find out if he has the code for it, or if I need to reimplement it (not what I really want to do)...
by masher
Thu Apr 29, 2010 2:38 am UTC
Forum: Science
Topic: Deconvolving line profiles
Replies: 4
Views: 554

Deconvolving line profiles

I have an issue. I have a measured line profile. It shows the intensity of the peak as I scan my sample in the x-ray beam. I want to deconvolve the instrument and sample contributions. I can pretty much safely assume* that the instrument contribution is gaussian. I can further assume that the sample...
by masher
Sat Apr 24, 2010 6:40 am UTC
Forum: Mathematics
Topic: Margin of error when the sample percentage is zero?
Replies: 17
Views: 1756

Re: Margin of error when the sample percentage is zero?

Given the values you've substituted, should the eqn be (1-x)^1/n ? In this case, the math is really easy: (1-x)^n is the chance that on n samples you get 0 events. It is nicely monotonic, so once we find the point where it crosses our reasonableness threshold, we will have the reasonable range for ...

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