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Topic: How to invert a matrix?
Replies: 6   Last Post: Oct 9, 1996 11:18 AM

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Michael Nachtigaeller

Posts: 8
Registered: 12/18/04
Re: How to invert a matrix?
Posted: Oct 7, 1996 7:23 AM
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On 02.10.96 george_cummings@email.mot.com () wrote:

> >Can anyone explain how to invert a matrix and provide an example.
> the easiest way is to add an equally sized identity matrix. Then do
> row reduction 'stuff' ( add multiples of one row to another ) until
> the original matrix is an identity matrix, doing the same operations
> to the identity matrix that you added.

[...]
>
> This is a lot easier than that alternating-sign cofactor expansion
> nonsense ( the math majors may find fault with this ... may not work
> for some matrices or something ... )

Not that I knew, though I'm not a math major. I learned exactly the same
procedure in a course on matrices designed for statisticians, and I can't
say the lecturer was any bad.

Michael





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