function zplane(f,ax)
%ZPLANE  DFILT object zero-pole plot.
%   ZPLANE(F) plots the poles and zeros of the equivalent
%   transfer function corresponding to the DFILT object F.
%
%   See also DFILT/IMPZ, DFILT/FREQZ, DFILT/GRPDELAY, DFILT/STEPZ.

%   Author(s): R. Losada
%   Copyright 1988-2000 The MathWorks, Inc.
%   $Revision: 1.3 $  $Date: 2000/06/13 21:21:33 $ 


if nargin ==1,
    ax = axes;
end

% Use the zpk method to get z and p
[z,p] = zpk(f);

zplane(z,p,ax);

% EOF - zplane.m    
    
