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    function zi = ziexpand(Hd,x,zi)
%ZIEXPAND Expand initial conditions for multiple channels when necessary
%   ZI = ZIEXPAND(Hd, X, ZI) 
%
%   This function is intended to only be used by SUPER_FILTER to expand initial
%   conditions. 
%
%   This should be a private method.   

%   Author: Thomas A. Bryan, R. Losada
%   Copyright 1988-2002 The MathWorks, Inc.


% There are no states so this is a no-op