Question

Anyone who knows about LU factorisation?

Answer 1

LU what's that

Answer 2

solving matrices

Answer 3

your hot

Answer 4

lol thanx :D

Answer 5

Pity Joe is not here....

From a discussion we had the other day, it's a decomposition of a square matrix into (L)ower and (U)pper triangular matrices by way of some sort of row operations.

Answer 6

And we decided then that Wolfram does it wrong...:-)

Answer 7

yessssss
i can do that....
i wna know when i hav to use the P-matrix?

Answer 8

i can do all the row operations .... nd find L and U....
i just saw the P-matrix and i got confused

Answer 9

You use elimination to produce the U matrix. However, sometimes the pivot position is zero. You then use a P matrix to swap rows so the pivot position is non-zero.

Answer 10

so the P-matrix is the identity matrix but the rows are switched?

Answer 11

Yes.

Answer 12

Best wait for Joe.

According to Wiki, that is LUP (with partial pivoting).

Answer 13

joe is here :D

Answer 14

phi is on point

Answer 15

and hi :) lol

Answer 16

Jeez, 3 minutes to post an answer and no update.

Hi Joe.

Answer 17

hehe hiii :D

one more question

Answer 18

finding A(1), M(1), M(2) A(2) is just another method of getting L and U??

Answer 19

So phi is a matrix man as well...

Answer 20

im not quite sure what that notation means >.<

Answer 21

its M with a small (1) on the top

it says that U=M(2)*A(2) L=(M(1))inverse * M(2) inverse

Answer 22

Ah, then yes. Its just another method of producing L and U.

Answer 23

For a while, L and U will be the main way of looking at matrices, until you learn other methods of factoring them

Answer 24

i hate it...i will stick to the row operations

Thankyouuu JOE :D ... Estudier and phi :D

Answer 25

yeah, row operations are boss lol

Answer 26

:D:D:D

Answer 27

No, thank u (all), I learn something too..:-)

Answer 28

:D....

Answer 29

everyone should learn Linear Algebra, its the best math evar >.>

Answer 30

I still prefer vectors, though....

Answer 31

joooooeeee i might ask about jacobi and gauss seidel if i get stuck....u know them?

Answer 32

i believe i do....i might have to find my text books lol. I have 3 linear algebra books lying around the house somewhere <.<

Answer 33

hehehe...oh well IF i needed help ... and thanx again :D

Answer 34

no prob :)

Answer 35

hello :)

Answer 36

http://openstudy.com/study#/updates/4f322096e4b0c0e479618c79

Answer 37

hmmmm