我要评论相关代码打开matlab源码也可以看到，这里做了简单实现，与源码并不完全一样。
实现代码
[h2 w2] = freqzfir(data);
[h1 w1] = freqz(data);
h2=h2';
h12 = [h1, h2];
[h4 w4] = freqziir(b,a, 2001,true);
[h3 w3] = freqz(b,a, w4', 'whole');
h4 = h4';
h34 = h3-h4;
function y = mpolyval(x, c)
y = zeros(size(x));
y(:) = c(1);
for i = 2:length(c)
y = x .* y + c(i);
end
end
function [h, w] = freqziir(b, a, count, whole)
if whole
lastpoint = 2 * pi;
else
lastpoint = pi;
end
w = [0:count-1]./count.*lastpoint;
% w = w';
c = 0 - 1i;
zm1 = exp(c * w);
h1 = mpolyval(zm1, a);
h2 = mpolyval(zm1, b);
h = h2./h1;
end
function [h, w] = freqzfir(b)
a = [1];
count = 512;
n = length(b);
whole = false;
if whole
lastpoint = 2 * pi;
else
lastpoint = pi;
end
w = [0:count-1]./count.*lastpoint;
% w = w';
c = 0 - 1i;
zm1 = exp(c * w);
mh2 = mpolyval(zm1, b);
mh1 = exp(-1i*w*(n-1));
mh = mh2./mh1;
h = mh;
end
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