im tryin 2 invert a 3*3 matrix
how do we invert them in general?
anyone pls lend me a hand
my brain suddenly disfunction after much add maths practice

You want to find the inverse of 3x3 matrix right?

The simplest way is to use the determinant or co-factor method.

Next, you may use more advanced methods such Gaussian, Jordanian or Gauss-Jordanian.

This post has been edited by David83: Mar 21 2006, 06:28 PM

invert?

{ a b c }
{ d e f }
{ g h i }

=

{ a d g }
{ b e h }
{ c f i }

do u mean by that?...

This post has been edited by farique: Mar 21 2006, 08:45 PM

that is transpose, my dear

gosh.. my rusty maths.. sorry for any inconvinience..

The cofactor method is the simplest, I can say.
Google for +"cofactor" +"inverse" +"matrix"

To perform matrix inversion, you first need to refresh your memory on getting determinant of a matrix.

I didn't know 3x3 is covered in spm add maths, anyway here is my answer:  3x3_inverse.doc ( 19k ) Number of downloads: 32


required MS word 2002 or better to open.