Section: Optimization and Curve Fitting
p = poly(r)
when r is a vector, is a vector whose elements are the coefficients
of the polynomial whose roots are the elements of r. Alternately,
you can provide a matrix
p = poly(A)
when A is an N x N square matrix, is a row vector with
N+1 elements which are the coefficients of the
characteristic polynomial, det(lambda*eye(size(A))-A).
Contributed by Paulo Xavier Candeias under GPL.
poly
--> A = [1,2,3;4,5,6;7,8,0]
A =
1 2 3
4 5 6
7 8 0
--> p = poly(A)
p =
1.0000 -6.0000 -72.0000 -27.0000
--> r = roots(p)
r =
12.1229
-5.7345
-0.3884
-->
quit