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Old 10-07-2009, 06:37 PM   #4891
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The inversion of a 3x3 Matrix has to be one of the most tedious things ever.
Are you calculating determinants?
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Old 10-07-2009, 06:40 PM   #4892
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Determinants isnt too bad, but calculating the co-factors is a pain :P. My Calculator can do it, but the teachers wants to see the working (he know's of my ways :P)
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Old 10-07-2009, 06:42 PM   #4893
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I don't know co-determinants. In fact, the only thing I bothered to learn from matrices are determinants. I needed them to calculate cross products.
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Old 10-07-2009, 06:48 PM   #4894
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Oops, I meant co-factors.

Well, if you had a matrix:

|1|2|4|
|6|3|9| = A
|2|5|3|

then the det(A) would be 1(9-45)-2(18-18)+4(60-6).

To find the co-factors you need to do something similar... you end up with another matrix though.

The co-factor of 1 in matrix A would be: (3*3)-(5*9), the co-factor of 2 would be (6*3)-(9*2) and so on for 1,2,4,6,3,9,2,5 and 3.

ANYWAY. It's just annoying :P
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Old 10-07-2009, 09:57 PM   #4895
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Matrixes are the worst things ever. And to thing I want to minor in math.......
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Old 10-07-2009, 10:10 PM   #4896
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Matrixes are the worst things ever. And to thing I want to minor in math.......
Minor in math isn't bad. I'm getting mine next semester. This is what you need (at least that's what Wichita State University asks from me)

Calc1
Calc2
Calc3
Diff Eq
Any class past Diff Eq
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Old 10-07-2009, 10:18 PM   #4897
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A friend of my dad's told me he's going to give me a 1985 Ford F-150 4x4. He's got no use for it, rather give it away to a family friend if I help him build his new house.
It runs through a fair bit of oil though and only gets 14MPG. Still, trade a truck for help building a house next summer is a sweet deal.
Ever since I've been 11, I've wanted that truck, lol. 200000km's on it,

Here's a few shots what the truck looks like. I havnt had time to grab any actual pictures, but it's exact same as this. In almost as good of shape too.

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Old 10-07-2009, 10:48 PM   #4898
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^ Awesome! "free" stuff is nice
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Old 10-07-2009, 10:56 PM   #4899
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Yeah, I'm trying to decide what I should do. I got my new Taurus thats good daily driver, but I really want to insure and drive the truck. Insurance for a brand new driver is crazy expensive. I gotta figure out which I want more. Which will probably be the truck. Would make an excellent hunting/mud truck, and that's something I'm in need of. Our truck is 2x4 so its not great for offroad. But gas is going to be a little high. I'll probably give the car to my dad (it'll still pass certification) to drive around, which I can borrow most of the time, and invest in insuring and lifting the truck.
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Old 10-07-2009, 10:59 PM   #4900
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Originally Posted by JogaBonito1502 View Post
Minor in math isn't bad. I'm getting mine next semester. This is what you need (at least that's what Wichita State University asks from me)

Calc1
Calc2
Calc3
Diff Eq
Any class past Diff Eq
hmm... AP calc BC is basically Calc 2, right?
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