First, we need to define the transfer function $H(z)$ in Matlab. We can do this using the `tf` function. For example, if the transfer function is $H(z) = \frac{1}{z^2 - 0.5z + 0.25}$, we can define it as follows:
```matlab
num = [1];
den = [1, -0.5, 0.25];
H =
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