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zplane

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

Function Synopsis

[h1, h2, h3]=zplane(z,p);

Help text

ZPLANE	Z-plane zero-pole plot
	ZPLANE(Z,P) plots the zeros Z and poles P (in column vectors) with the 
	unit circle for reference.  Each zero is represented with a 'o' and 
	each pole with a 'x' on the plot.  Multiple zeros and poles are 
	indicated by the multiplicity number shown to the upper right of the 
	zero or pole.  ZPLANE(Z,P) where Z and/or P is a matrix plots the zeros
	or poles in different columns with different colors.

	If either argument is a row, ZPLANE finds the roots of the argument
	with ROOTS.  So, ZPLANE(B,A) where B and A are row vectors containing
	transfer function polynomial coefficients plots the poles and zeros
	of B(z)/A(z).  ZPLANE assumes scalars are zeros or poles.

	[H1,H2,H3]=ZPLANE(Z,P) returns vectors of handles to the lines and 
	text objects generated.  H1 is a vector of handles to the zeros lines, 
	H2 is a vector of handles to the poles lines, and H3 is a vector of 
	handles to the axes / unit circle line and to text objects which are 
	present when there are multiple zeros or poles.  In case there are no 
	zeros or no poles, H1 or H2 is set to the empty matrix [].

	See also FREQZ.

Cross-Reference Information

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Produced by mat2html on Wed Feb 8 12:25:18 EST 1995
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