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symbolic z transform answer to transfer function

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William
William 2013-9-9
Is there a way to convert the symbolic answer of ztrans() to a transfer function tf()?
right now I am using
syms n z
x2_n = (1+n+n^2)
ztrans(x2_n)
I need to get the answer into a transfer function. Is there a way to do this?
Thanks!

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Azzi Abdelmalek
Azzi Abdelmalek 2013-9-9
编辑：Azzi Abdelmalek 2013-9-9
syms n z
x2_n = (1+n+n^2);
m=ztrans(x2_n);
h=collect(m);
[ii,jj]=numden(h);
num=sym2poly(ii);
den=sym2poly(jj);
ts=1 % Sample time
model=tf(num,den,ts)

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