Thanks Justin.  My mistake... minimal_polynomial is what is required.
Graham

On Mar 17, 8:21 pm, "Justin C. Walker" <jus...@mac.com> wrote:
> On Mar 17, 2012, at 13:13 , firebird wrote:
>
> > I was expecting x^2 as the characteristic polynomial.  What's gone
> > wrong?
>
> I believe that the characteristic polynomial of a matrix, M, is given as 
> "det(\lambda I-M)" or something similar.  In your case (a 12x12 matirx), you 
> should expect a polynomial of degree 12.  Perhaps you were thinking of the 
> minimal polynomial?
>
> HTH
>
> Justin
>
> --
> Justin C. Walker
> Curmudgeon-at-large
> Director
> Institute for the Absorption of Federal Funds
> ----
> 186,000 Miles per Second
> Not just a good idea:
>   it's the law!
> ----

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