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    function n = thisnstates(Hd)
%NSTATES  Number of states in discrete-time filter.
%   NSTATES(Hd) returns the number of states in the
%   discrete-time filter Hd.  The number of states depends on the filter
%   structure and the coefficients.
%
%   See also DFILT.   
  
%   Author: Thomas A. Bryan
%   Copyright 1988-2003 The MathWorks, Inc.

n = 0;