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%clearing the screen, closing all open windows and clearing memory
%defining s as the transfer function element
%making a logarithmical frequency vector with 500 points between 10^-2 and
freq = logspace(-2,2,500);
%defining the system a
Ga = zpk(1/(s*(s+2)*(s+4)));
%getting numerator and denumerator from the transfer function
[numa,dena] = tfdata(Ga,'v');
%getting a frequency response
ha = freqs(numa,dena,freq);
%getting magnitude in decibels
magadb = db(abs(ha));...
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