I know this is high school math - Earth Empires Forum

Detmer

Member
4252

Jun 19th 2012, 22:21:40

But please verify the derivative of this (with respect to u) for me

(1.6612*u^-1)-(0.4721*u^-2)+(0.0671*u^-3)-(0.0043*u^-4)+(0.000106*u^-5)

I can not figure out why I am getting a mismatch between derivative values at specific points and what I think they should be... I figure I should verify I haven't made some stupid mistake that I can not see for some reason...

locket

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6176

Jun 19th 2012, 22:23:49

You did that in highschool?

Detmer

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Jun 19th 2012, 22:29:59

Originally posted by locket:

You did that in highschool?

Yeah... I thought most people here would have taken calculus in high school... if not then college math... maybe I am wrong in assuming that like 90% of people here know calculus...

locket

Member
6176

Jun 19th 2012, 22:32:05

hmm... I did take a beginners course in my final year but it was fairly basic. My main calc knowledge is all post secondary stuff. I also choose not to relive those moments though so you'll have to wait for someone who actually enjoyed it I guess haha..

Boltar

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Jun 19th 2012, 22:36:25

i failed algebra bud.. i was more into history and lunch

Detmer

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Jun 19th 2012, 22:39:54

Unfortunately it was suggested to me to plug that into the wolfram alpha derivative calculator and wolfram alpha got the same answer as me... all that does is serve to blow my mind...

that function is monotonically decreasing with u between .117 and .667 but when I calculate the actual derivative value for several values in that range I only get .667 as having a negative value... hmmm....

Detmer

Member
4252

Jun 19th 2012, 23:00:22

.0172 != .0712

Nothing to see here folks. Move along.

UBer Bu

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365

Jun 19th 2012, 23:01:46

You sure about that? Graphing the derivative it seems plenty negative to me in that range.

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anoniem

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Jun 19th 2012, 23:46:55

you know you can use excel... lol :P

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Detmer

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Jun 19th 2012, 23:54:10

Originally posted by anoniem:

you know you can use excel... lol :P

That is where I was doing my calculations actually.

Or if you mean excel analytically solves derivatives then no, I did not know that.

Trife

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Jun 20th 2012, 0:29:37

Originally posted by locket:

You did that in highschool?

holy crap this lol

Lobo

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442

Jun 20th 2012, 0:41:30

ok...why did you need the answer? RL?... or you are back in a torture chamber aka school room?

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The only real progress lies in learning to be wrong all alone. ~Albert Camus

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ClayQ

Member
215

Jun 20th 2012, 0:42:29

I can't remember if this was freshman or sophomore year in highschool anymore... And honestly haven't used it since....

crysk

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324

Jun 20th 2012, 0:54:35

now I remember why I didn't go that far in math studies...ayi yai yai :P

archaic

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Jun 20th 2012, 1:02:03

I was a math minor in college, I used to be able to do this stuff in my sleep . . . then . . . 20 years happened. Now Detmer sounds like the Peanuts teacher to me.

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Tertius

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Jun 20th 2012, 1:21:21

Power law derivatives is basically the simplest calculus you learn in high school calculus. The formatting on the forums just makes it look tough, but really anyone can do it by learning the simple rule.

hawkeyee

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Jun 20th 2012, 1:34:49

I can teach up to Grade 10 math... Need help with quadratics and parabolas, I'm your man. SOHCAHTOA and fluff too.

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Detmer

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4252

Jun 20th 2012, 1:58:33

Originally posted by Lobo:

ok...why did you need the answer? RL?... or you are back in a torture chamber aka school room?

I am doing a sensitivity analysis between two parameters for my PhD thesis and there was a typo that I just could not see for the longest time. (I had .0712 written when it should have been .0172)

martian

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Jun 20th 2012, 15:09:54

detmer: Where I went to hs calculus wasn't required and not everyone did it..

As far as that goes why not just use matlab to do it analytically:P

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Azz Kikr

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Jun 20th 2012, 15:11:11

because matlab is annoyingly expensive :(
octave ftw? :P

Detmer

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Jun 20th 2012, 15:17:19

Originally posted by martian:

detmer: Where I went to hs calculus wasn't required and not everyone did it..

As far as that goes why not just use matlab to do it analytically:P

Well, I did it analytically in excel which also corroborated my belief that the derivatives all had to be negative. =P (and I would have done it in matlab but I already was using two copies of it for other stuff and didn't want to both opening a third or losing track of where I was in the other ones =P

Detmer

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Jun 20th 2012, 15:18:21

Also, most people where I grew up did not do calculus.... but I figured this group was not normal =P

Requiem

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Jun 20th 2012, 16:43:01

I did geometry in high school. Does that count?

Chadius

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Jun 20th 2012, 16:47:23

Detmer: We're not. ;)

LAF

Hawk

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Jun 20th 2012, 16:48:49

Somebody help with BEDMAS?

We did Calculus in Grade 12 and 13 back in the day.
I only remember that I took the course and passed.
Good thing you don't have to rely on people like me.

Ivan

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2363

Jun 20th 2012, 20:31:43

Hm here everyone was required to take some calculus courses

braden

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Jun 20th 2012, 20:36:16

canada doesn't believe in calculus. if you can't do it on an abacus then it isn't recognized

2+2=4, high school diploma, and see you never, teach! :(

(i am joking, i am just god awful terrible at math so i try to pass off the problem on others :P)

braden

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Jun 20th 2012, 20:37:54

requiem: i know my squares and circles and even my rhombi!!

UltraMarines

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343

Jun 21st 2012, 18:00:02

Had precalc my senior year in H.S. Then "business calc" my first 2 semesters in college. The only problem was my teacher was fresh off the boat from china so the language barrier made things difficult. That and it was my first class of the day at 730. never goes over well

Lobo

Member
442

Jun 22nd 2012, 1:10:17

lol @ braden
I am pretty amazed there are not more math heads here.... says a lot about why there is still more war than teching...

For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack
The only real progress lies in learning to be wrong all alone. ~Albert Camus

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BobbyATA

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2368

Jun 22nd 2012, 1:23:36

math phd here fwiw, and teaching calc 1 right now, so hopefully all my students can solve this problem. So there are some math heads around here:)

Lobo

Member
442

Jun 22nd 2012, 1:25:12

math makes me dizzy....

finding out now that there were other ways to learn... wish i had a better teacher... still wouldnt be a math head though :D *iz an art head

For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack
The only real progress lies in learning to be wrong all alone. ~Albert Camus

Original SANCT...

anoniem

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Jun 22nd 2012, 1:34:42

bobbyata since when did you have a phd in maths? i never knew..

re(ally)tired

BobbyATA

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Jun 22nd 2012, 1:38:15

Originally posted by anoniem:

bobbyata since when did you have a phd in maths? i never knew..

haha and yet I still had Slagpit do all my NW/optimization calcs=)

Actually tho, just finished this past year. I have no idea what you do btw, are you a fellow math nerd?

anoniem

Member
2881

Jun 22nd 2012, 1:50:24

i have a degree in maths yeh :)

tho i didnt do those nw/optimisation calcs either. it's so much better when slagpit can do it for u and call u a moron for failing to do it wrong :D

re(ally)tired

Pontius Pirate

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Jun 22nd 2012, 2:55:41

how do you go through high school without doing this? there are no special rules required... simply d/da: a^b = b*a^(b-1)

ok simplifying the equation might not be straightforward but you just put some time into it.

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