how to use the Bode matlab function to plot only the magnitude of a transfer function

65 views (last 30 days)
kay Dee
kay Dee on 19 Nov 2018
Hello i woul like to know how to use the Bode matlab function to plot only the magnitude of a transfer function .not both the magnitude and and the phase

Answers (2)

Star Strider
Star Strider on 19 Nov 2018
If you only want the magnitude, call bode as:
[mag,phase,wout] = bode(sys);
then plot ‘mag’ as a funciton of ‘wout’:
figure
plot(wout,,squeeze(mag))
  1 Comment
Janagan Papperi Devarajulu Deenadayalan
Hello. I am facing a problem which is other way around. I have only the magnitude plot and I would like to extract the transfer function of the system. Is this possible by any chance?

Sign in to comment.


Junfei Tang
Junfei Tang on 17 Apr 2019
The "bodeoptions" page of the MATLAB Documention lists the options of Bode Plot: https://se.mathworks.com/help/ident/ref/bodeoptions.html
To turn off the subplot of the phase, you can use
opts = bodeoptions('cstprefs');
opts.PhaseVisible = 'off';
before you use the "bode" function to create the plot.
Cheers and good luck! :-)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!