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angela210793
 3 years ago
Inverting matrices :S
angela210793
 3 years ago
Inverting matrices :S

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angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4dw:1328979083071:dw

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4cofactor, transpose, divide by determinant

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4or swap some stuff in a 2x2

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4let me try it and u tell me if i have solved it right ok???

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0yeah easy method for 2 by 2

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4forgot to transpose lol

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4last time .... and i forgot to use the checkerboard + correctly a b c d cofactors to: d c b a transposes to d c b a then divide by determinate maybe!! lol

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4is this right? dw:1328979427660:dw

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0for invertible 2x2 matrices\[A=\left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\]\[A^{1}=\frac1{\det A}\left[\begin{matrix}d & b \\ c & a\end{matrix}\right]\]looks good angela

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.0Trick: Swap the diagonal element and change the sign of offdiagonal ones

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4thats what i was trying for lol

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4I think cofactors will be d b c a

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4b is not its own cofactor

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.02 days back I learned a super fast way for doing 3x3 matrices

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4cofactor is the determinate of the submatrix

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4the submatrix of b is c in this case

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4Thanks guys :) How abt a 4x4 matrix????

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0\[ M = \left[ {\begin{array}{cc} x & y \\ z & w \\ \end{array} } \right] \] M = \begin{array}{cc} x & y \\ z & w \\ \end{array} \] \[ M^{1}= \frac{1}{xwyz}\left[ {\begin{array}{cc} w& y \\ z & x \\ \end{array} } \right] \]

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.0For this one the answer is\[ \begin{bmatrix} \cos x & \sin x \\ \sin x & \cos x \end{bmatrix} \]

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4same process just messier and more apt to computers

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0god it took me a long time to write that

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4well am not a computer....O.o

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4then youll have to get a monk

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0Cofactors is a good way to get bigger determinants if the matrix has some number of zeros in it

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0finding inverse of 4 by 4 by hand is long process, use a machine

FoolForMath
 3 years ago
Best ResponseYou've already chosen the best response.0I like to use reduce rowechelon for method for 4x4

satellite73
 3 years ago
Best ResponseYou've already chosen the best response.0i like to use maple

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0if it's like 0022 1536 0739 0297 you can expand the cofactors along the first column and you only need to take one determinant, all the minors are zero except for 1

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4ahhhhaaaa...I got it.....Thank you all ^^

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4a b c d e f g h i j k l m n o p +fgh  egh +efh efg jkl ikl ijl ijk nop mop mnp mno etc ........... then transpose; and divide off the original determinate

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4Amistre u lost me....wht did u do in there??

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4the cofactor is the determinants of the submatrixes

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4I'm sorry but all i know for algorithms is the name....I have no idea wht they r

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4dw:1328980027433:dw

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4i know wht submatrices r...

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4an algorithm is a means of operating on data multiplication is an algorithm; division is an algorithm its a process that aids us

amistre64
 3 years ago
Best ResponseYou've already chosen the best response.4it sorts the data into a usable form that we can maniipulate to our own devious devices :)

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0yeah, all that procedural stuff the process you use in long division for example computers do all problems with algorithms, they never think 'outside the box' so to speak

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4OMG!!! I'm going to fail :(

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4cause i have to colve 100 probs and i have solved only 10...yay :P

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4and my stupid teacher doesn't know to explain at all _

sasogeek
 3 years ago
Best ResponseYou've already chosen the best response.0i know nothing about 4x4 matrices but i know there's something to do with +  + something somewhere dealing with cofactors and it should look something like this... not sure

sasogeek
 3 years ago
Best ResponseYou've already chosen the best response.0i think that's what amistre did when he drew "a" and wrote "sub" in the box

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0that will get you the determinant of a 4x4 if you want the inverse I would probably use the row reduction thing

TuringTest
 3 years ago
Best ResponseYou've already chosen the best response.0this is a good site http://tutorial.math.lamar.edu/Classes/LinAlg/FindingInverseMatrices.aspx

sasogeek
 3 years ago
Best ResponseYou've already chosen the best response.0Angela, you need to get it, u don't need to "kinda" get it... that won't get u far lol :P

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4Leave me alone geek...:P I got microeconomy,finance,communication to study too _

sasogeek
 3 years ago
Best ResponseYou've already chosen the best response.0welcome to university :)

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4yea right :'( I wish i never started it :P

Akshay_Budhkar
 3 years ago
Best ResponseYou've already chosen the best response.0i wish i start it soon! @angela

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4tht's cause u don't know yet wht it feels like to be in univ :p

Akshay_Budhkar
 3 years ago
Best ResponseYou've already chosen the best response.0if i dont go to univ i wont be great :P

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4u may go to univ and still not b great Akshay

Akshay_Budhkar
 3 years ago
Best ResponseYou've already chosen the best response.0i will be its a guarantee as it is "ME" :P

Akshay_Budhkar
 3 years ago
Best ResponseYou've already chosen the best response.0u got matrices in economics?

angela210793
 3 years ago
Best ResponseYou've already chosen the best response.4yea we have maths...and we're getting too much information in just one lecture..teacher never shows an example to us and we're all like: ''Is tht chinese??''
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