pzmap

% -*- texinfo -*-
% @deftypefn {Function File} {[@var{zer}, @var{pol}] =} pzmap (@var{sys})
% Plots the zeros and poles of a system in the complex plane.
%
% @strong{Input}
% @table @var
% @item sys
% System data structure.
% @end table
%
% @strong{Outputs}
% @table @var
% @item pol
% @item zer
% if omitted, the poles and zeros are plotted on the screen.
% otherwise, @var{pol} and @var{zer} are returned as the 
% system poles and zeros (see @command{sys2zp} for a preferable function call).
% @end table
% @end deftypefn