MATLAB Program for Frequency Response Analysis for a Transfer Function

to analysis the frequency response of any transfer function we use FREQS (for analog system or for S-domain) & FREQZ (for digital system or for Z-domain).

Program (for S-domain):

clear
clc
num=input('enter the coefficient of numerator: ');
den=input('enter the coefficient of denominator: ');
freqs(num,den)

Output:

enter the coefficient of numerator: 1
enter the coefficient of denominator: [1 2 8]

Program (for Z-domain): 

clear

clc

num=input('enter the coefficient of numerator: ');

den=input('enter the coefficient of denominator: ');

freqz(num,den)

Output:

enter the coefficient of numerator: [1 1 2]

enter the coefficient of denominator: [2 1 3]