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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | POLY POLY Convert Roots To Polynomial Coefficients
Usage
This function calculates the polynomial coefficients for given roots
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.
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