Bode Plot Transfer Function

Hi Friends,

How do I only plot the magnitude of a transfer function something like this.

          s^4 +  s^2 + 1
  ------------------------------------------
  s^4 + 2 s^3 +3 s^2 + 4 s + 1

I am interesting in seeing the magnitude plot only.Thank you.

Answer 1

[Dimitris Kalogiros]

Here you are:

close all
clearvars

s=tf('s')

H=(s^4+s^2+1)/(s^4+2*s^3+3*s^2+4*s+1)

opts = bodeoptions('cstprefs');
opts.PhaseVisible = 'off';
bodeplot(H, opts );
grid on; zoom on;

[Joseph Mohane]

Thank you very much.