On 02.10.96 firstname.lastname@example.org () 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.