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poly (MATLAB Functions)
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9/15/2005 1:08 AM
Documentation
MATLAB
MATLAB Functions
MATLAB Function Reference
poly
Polynomial with specified roots
Syntax
p = poly(A)
p = poly(r)
Description
p = poly(A)
where
A
is an
n
by
n
matrix returns an
n+1
element row vector whose elements are the coefficients of
the characteristic polynomial,
.
The coefficients are ordered in descending powers: if a vector
c
has
n+1
components, the polynomial it represents is
p = poly(r)
where
r
is a vector returns a row vector whose elements are the coefficients of the polynomial whose
roots are the elements of
r
.
Remarks
Note the relationship of this command to
r = roots(p)
which returns a column vector whose elements are the roots of the polynomial specified by the coefficients row vector
p
. For vectors,
roots
and
poly
are inverse functions of each other, up to ordering, scaling, and roundoff error.
Examples
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