** Characteristic polynomial. **

** If A is an N by N matrix, POLY(A) is a row vector with **

** N+1 elements which are the coefficients of the **

** characteristic polynomial, DET (lambda*EYE (A) - A) . **

** If V is a vector, POLY(V) is a vector whose elements are **

** the coefficients of the polynomial whose roots are the **

** elements of V . For vectors, ROOTS and POLY are inverse **

** functions of each other, up to ordering, scaling, and **

** roundoff error. **

** ROOTS (POLY(1:20)) generates Wilkinson's famous example. **

** **

** **

** See also ROOTS , POLYVAL . **

** **