The companion matrix to a
monic polynomial
 |
(1)
|
is the
square
matrix
![A=[0 0 ... 0 -a_0; 1 0 ... 0 -a_1; 0 1 ... 0 -a_2; | | ... ... |; 0 0 ... 1 -a_(n-1)]](https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tmHHkXD0ZoLXnXkTn9nrb9Iiv32--1Kh_VzDlXKgg0NKBamDa7fy9p6dHOQ_hZUlJ7T-GWRPDEy6ldQsfU-2J4g9ObjJScIjjZ2iplbC6NgREfxkd_VKnxU6bdxlyOdyEovxnSaWY9-kezlwaL8WDwq-H6k80=s0-d) |
(2)
|
with ones on the
subdiagonal and the last column given by the coefficients of

. Note that
in the literature, the companion matrix is sometimes defined with the rows and columns
switched, i.e., the
transpose of the above matrix.
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