poly2rc

(/tools/hpmatlab/toolbox/signal/poly2rc.m)

Function Synopsis

k = poly2rc( a )

Help text

POLY2RC Compute reflection coefficients from polynomial coefficients.
	K = POLY2RC(A) finds the reflection coefficients of the lattice
	structure of discrete filter A.  A(0) must not be 0, and A must
	be real.  K is a row vector of length one less than A.

	A simple, fast way to check if A has all of its roots inside the unit 
	circle is to check if all of the K's have magnitude less than 1, e.g.
	    stable = all(abs(poly2rc(a))<1)

	CAUTION: If abs(K(i)) == 1 for any i, finding the reflection
	coefficients is an ill conditioned problem. POLY2RC will return
	some NaNs and provide a warning message in this case.

	See also RC2POLY.

Cross-Reference Information

end            /tools/hpmatlab/toolbox/matlab/lang/end.m
for            /tools/hpmatlab/toolbox/matlab/lang/for.m
i              /tools/hpmatlab/toolbox/matlab/elmat/i.m
length         /tools/hpmatlab/toolbox/matlab/general/length.m