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How can I perform a summation of a freqz function

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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.

Accepted Answer

Torsten
Torsten on 6 Apr 2023
Edited: Torsten on 6 Apr 2023
syms z k
F = @(a) symsum(z^(-k),k,0,a);
F(2)
ans = 

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