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@maria flor • 24 Jan, 2011
It is assignment given to us by our instructor and I still don't know what's the answer.
Find the inverse matrix using gaussse-jordan method.
A=
1 3 2 4 5 2 1 0 1
0 2 3 4 2 1 1 1 1
-2 2 4 4 3 -2 2 2 1
3 3 3 3 1 1 0 0 0
4 2 -3 4 2 2 1 0 0
5 -2 0 0 1 0 0 0 1
6 -2 2 1 1 1 0 0 1
7 2 2 2 -2 1 0 1 2
8 -3 2 1 1 1 1 1 -2
@eternalthinker • 24 Jan, 2011 Re: 9x9 matrix

Was it a programming assignment (C for instance) ?
@Reya • 24 Jan, 2011 Re: 9x9 matrix

@ET: It is not a programming assignment.Gauss-Jordan method comes in Numerical method subject!

@Maria: Did you try something??What answer you got??
@nikeace003 • 24 Jan, 2011 Re: 9x9 matrix

nice flor..hahaha..can we use elimination method.?
@silverscorpion • 24 Jan, 2011 Well, what have you got so far and where are you stuck?

Gauss Jordan elimination is pretty easy, if I remember right..

Just write 2 9X9 matrices side by side, and perform row or column operations on both sides so that, the original matrix becomes a diagonal matrix.

Then, the other matrix will give you the inverse..
@maria flor • 25 Jan, 2011 I'm almost at fifth page of the solution to the problem...still working on it.... I'll show the solution maybe tomorrow...
@eternalthinker • 25 Jan, 2011 Is this the answer: 😕

0.04 -0.18 0.05 0.04 0.02 0.02 0.01 0.06 0.03
0.22 -0.31 0.05 0.04 -0.04 -0.08 -0.19 0.18 0.03
0.1 -0.33 0.15 -0.02 -0.05 -0.57 0.52 0.05 -0.02
-0.47 0.54 -0.06 0.32 0.18 0.33 -0.01 -0.29 -0.12
0.09 0.55 -0.26 0.18 -0.22 1.11 -0.96 -0.14 0.12
0.23 0.3 -0.28 -0.31 -0.1 -0.21 -0.05 0.13 0.12
0.93 -3.46 1.5 -1.34 0.76 -4.74 3.95 0.69 -0.22
-0.35 2.77 -1.12 0.33 -0.74 3.62 -3.64 -0.08 0.55
0.15 -0.25 0.14 -0.32 0.04 -0.34 0.51 0.18 -0.21
@maria flor • 26 Jan, 2011 @et: check it by multiplying your answer you got to the given problem. If the product you got will be an identity matrix...then you got the correct answer..
You're really fast.. I spent almost two nights of solving it but still got the wrong answer!!! You're awesome!!
@maria flor • 28 Jan, 2011 find the value of: m,n,p,q,r,s,and t using gauss-jordan method... pls. show your solution
here are the 7 equations:
2m-2n+4p-7q+r+2t=24
3m+2n+8q-3s=17
3n-p+8r+5t=80
m+5p-4q-2r+s-2t=12
2m+4n+2q-3s=12
m+3q+2s-4t=-11
2n-3p-q=-13
@maria flor • 28 Jan, 2011 hey ET can you show me your solution about the 9x9 matrix???
@eternalthinker • 28 Jan, 2011 Hey, I shan't take the credit for it. I just wrote some code to find the inverse. The computer did the work 😉
Only meant to provide you the final result!
@maria flor • 28 Jan, 2011 Oh I see. I thought you were the one who solve it.
@ISHAN TOPRE • 30 Jan, 2011 Hey Maria flor is it a complete matrix of 8 rows(Horizontal) and 9 columns(Vertical)?
And what do you exactly want to do with it when you say 'solve'?
Tell me I will definitely solve it.
@maria flor • 30 Jan, 2011 It is a 9 rows and 9 columns, try to count it. Et never gave any solution and I really need the solution regarding bout 9x9 matrix. I want to practice in solving more than 9x9 matrix and the solution will be my guide.
@ISHAN TOPRE • 31 Jan, 2011 Hey Maria flor,I haven't solved it but it is actually simple but lengthy.
I can tell you how to solve it by Gausse jordan method....
A=A inverse

IA inverse=A*I

now solve to reduce A to get an Identity matrix
Hence you will get A inverse..
Still problem? Refer book for GJ method or google search...😀
@maria flor • 31 Jan, 2011 I already know the answer. I tried to solve it but still didn't got the answer. I want to have solution regarding bout this, to be able to know where I made a mistake.... How about the other problem???
@nikeace003 • 02 Feb, 2011 this was already solved, i guess..anyone still working on this?
7.4k views

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