% Numerical Mathematics and Computing, Fifth Edition
% Ward Cheney & David Kincaid
% Brooks/Cole Publ. Co.
% (c) 2003
%
% file:  poly_roots1.m
%
% find the roots of the polynomial x^3 - 2x^2 + x - 3
 
p = [1 -2 1 -3]
r = roots(p)