How can I perform a summation of a freqz function

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Anthony Koning
Anthony Koning 2023-4-6
编辑： Torsten 2023-4-6
Hi, I'm currerntly trying to figure out how to perform a summation of a frequency transfer function. How would I go about summizing a freqz function of z^-k for any given values. For example, if I wanted to range k from 0-3, how would I arrange the sumsym function to evaluate the following transfer function of 1+z^-1+z^-2+z^-3. Thanks for any help.

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Torsten
Torsten 2023-4-6
编辑：Torsten 2023-4-6
Ran in:
syms z k
F = @(a) symsum(z^(-k),k,0,a);
F(2)
ans = 

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