plot absolute frequency response

hi

I have this code

clc 
clear all 
close all 

s = tf('s');

t1 = 1;
pade1 = (1-((s*t1)/2))/(1+((s*t1)/2))

t2 = 0.3;
pade2 = (1-((s*t2)/2))/(1+((s*t2)/2))

t3 = 1.8;
pade3 = (1-((s*t3)/2))/(1+((s*t3)/2))

t4 = 0.35;
pade4 = (1-((s*t4)/2))/(1+((s*t4)/2))
G = [(-21.6*pade1)/(8.5*s+1) (1.26*pade2)/(7.05*s+1);...
   (-2.75*pade3)/(8.2*s+1) (-4.28*pade4)/(9.0*s+1)]


G_hat = inv(G)

RGA = (G.*(G_hat)')

and I want to plot a frequency response for RGA(1,1)

and i want to plot absolute magnitude of this tf

can anyone help me

Thank you

Answer 1

[Vinay]

Hi @arash rad,

You can plot the Relative Gain Array (RGA) frequency response using the `bode` function, which provides both the magnitude and phase response of the system.

To visualize the magnitude, you can extract it from the `bode` function's output and plot it on a semilogarithmic axis.

[mag, ~, w] = bode(RGA(1,1));
semilogx(w,mag);