www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@abstractcascadeallpass/zpk.m
function [z,p,k] = zpk(this) %ZPK Discrete-time filter zero-pole-gain conversion. % [Z,P,K] = ZPK(Hd) returns the zeros, poles, and gain corresponding to the % discrete-time filter Hd in vectors Z, P, and scalar K respectively. % Author(s): R. Losada % Copyright 2006 The MathWorks, Inc. if ~isequal(size(this),[1,1]), error(message('signal:dfilt:abstractcascadeallpass:zpk:InvalidDimensions')); end hd = dispatch(this); [z,p,k] = zpk(hd); % [EOF]