people here are into math, right? I know lucas does economics and nestor does some finance stuff or something.
I haven't taken an actual math course since my last year of high school (four years ago), but I'm taking a calculus course right now and loving it.
math is a nice escape from the usual messy issues of education and race that I enjoy talking about in some of my other classes. math is just so cut and dry and it's really satisfying to understand it because I feel like you can have something of a complete understanding of part of it. social issues are more difficult to get a definite, static grasp on.
I haven't taken an actual math course since my last year of high school (four years ago), but I'm taking a calculus course right now and loving it.
math is a nice escape from the usual messy issues of education and race that I enjoy talking about in some of my other classes. math is just so cut and dry and it's really satisfying to understand it because I feel like you can have something of a complete understanding of part of it. social issues are more difficult to get a definite, static grasp on.
:)
lr is way more mathy than me, the extent of my (higher level) math skills is like basic calculus and even less geometry (enough to understand option pricing and work with economic stuff).
math is nice though. however i think it gets less 'cut and dry' at higher levels.
math is nice though. however i think it gets less 'cut and dry' at higher levels.
yeah, as with any science, it isn't completely cut and dry. but you have to get way up into fairly current research.
but that is exactly why i loved (and love) it--it's the purest science, hands down.
but that is exactly why i loved (and love) it--it's the purest science, hands down.
Math is hard ... We need a math help thread.
89.7 on my trig exam ... 90 .... Woo hoo
89.7 on my trig exam ... 90 .... Woo hoo
good call, math help thread ftw
got a 96 on my first calc exam. just got it back today. the only mistake I made was a stupid one. we were supposed to simplify some expression and I ended up with 3 multiplied by the natural logarithm of Euler's number on one side (ln e), which is equal to 1. so that side of the equation went 3(ln e) = 3(1), so it should have been equal to 3. I guess in a rush I wrote 1 on the next line instead of 3, so my final result for x was incorrect :(. I'll take a 96 though :).
As a person, I appreciate your genius ...
... As a student .. Fuck you
... As a student .. Fuck you
^ Hey man I was just kidding .. sheesh
haha I know :).
we did a neat optimization problem in my class today. the goal was to figure out, given any volume (V), what the relationship between the height (h) and the radius of the base (R) of a cylinder should be to achieve the smallest possible surface area (A).
I was bored so I made a PDF explaining it.
http://www.thehomerow.net/~brain/optimization.pdf
I was bored so I made a PDF explaining it.
http://www.thehomerow.net/~brain/optimization.pdf
wow, those equations are blurry
nice work though :)
where the second-order sufficient conditions for optimization?
yeah, I didn't notice that the equations looked like shit because Preview.app anti-aliased them. sorry!
I don't even know what that means, lucas. what do you mean?
I don't even know what that means, lucas. what do you mean?
you have to prove that you are at a local maximum and not a local minimum (or vice versa).
ok so I don't know most of this math terminology and shit, but I think I know what you mean kind of.
since I got R=(V/2pi)^(1/3), and plugging any plausible volume into that (i.e., any positive number) gives you a positive number.
after typing that I don't think I answered your question.
since I got R=(V/2pi)^(1/3), and plugging any plausible volume into that (i.e., any positive number) gives you a positive number.
after typing that I don't think I answered your question.
define your domain!
aside: i have totally lost my theoretical math skills... all the mathematical theory in finance is basically done for me.
I used "h" instead of "delta x" just 'cause that's how I learned it, but here:
http://img412.imageshack.us/img412/2932/photo12re9.jpg
I think that's it.
http://img412.imageshack.us/img412/2932/photo12re9.jpg
I think that's it.
MATH FACE
hahaha I was going to just hold it up to the computer but sticky notes are always begging to be stuck on someone's forehead.
andre spotted the error for me. thanks asemi!
i need to solve this equation:
2sin²x - 6sinxcosx + 6cos²x=1
x is in [0°, 360°]
2sin²x - 6sinxcosx + 6cos²x=1
x is in [0°, 360°]
identities?
what now?
maybe use stuffs like this?
http://www.sosmath.com/trig/Trig5/trig5/trig5.html
http://www.sosmath.com/trig/Trig5/trig5/trig5.html
yeah identities are def in order
i was wondering about programming, is it bad form to use unicode characters in programming if the program reads them fine? like µ or θ or Θ or ω etc. i know a lot of people write mu or theta but it is convenient for me to just use my greek keyboard scripts.
darn, it looks like R can only understand β and µ. α and Θ are read as a and T.
that's too bad. it's so awesome ttf supports unicode :D
You'll probably enjoy Fortress (http://projectfortress.sun.com/Projects/Community/) :P
Sample code: http://research.sun.com/projects/plrg/SampleC … NAS-CG.pdf
Sample code: http://research.sun.com/projects/plrg/SampleC … NAS-CG.pdf
this thread made me miss my calculus class.
does anybody remember what you call that mapping that convert a number from ordinal to a new base system dropping the cumulative digit? for example if Ψ maps into the 12 system then Ψ(13)=1, Ψ(1)=1, Ψ(23)=11, etc. if someone just remembered what it was called in programming that would be sufficient. thanks!
are you talking about a modulus?
Yea that sounds like a basic modulus operation.
perfect! thanks. i have been writing modular transformations by hand and been fairly successful but i think the people i am working with will prefer my modular transformations to be less explicit.
um, i am having difficulty finding functions that map to modular spaces. is there an alternative name that anybody might be aware of for programmers who want to distinguish modular math from "modular programming techniques"?
Modular arithmetic?
heh, the function i was looking for was simply mod(#, modular count)
mod is great!
I need a crash course in basic trigonometry to pass this math placement exam and take calculus. I don't want to have to suffer through precalc.
a^2 + b^2 = c^2
Profit.
Profit.
maybe this helps? http://www.khanacademy.org/ browser search: Trigonometry @ end of page.
^ this.
Place is amazing for re-learning math.
Place is amazing for re-learning math.
good link.
Indeed.
been automating usage reports at work using gnuplot... EPIC
been automating usage reports at work using gnuplot... EPIC