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

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

Answer 1

[Star Strider]

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))

[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?

Answer 2

[Junfei Tang]

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! :-)