www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@scalar/iirxform.m

    function [Ht, anum, aden] = iirxform(Ho, fun, varargin)
%IIRXFORM IIR Transformations

%   Author(s): J. Schickler
%   Copyright 1988-2002 The MathWorks, Inc.

% This should be private

[b, a] = tf(Ho);

[num, den, anum, aden] = feval(fun, b, a, varargin{:});

% Create the transformed and allpass filters
Ht = copy(Ho);

% [EOF]