How to get frequency resolution from bode plot or transfer function?

I want to know the frequency resolution from bode plot I estimate by using system identification toolbox. But how?

Answer 1

[Star Strider]

You have to ask it to return them as outputs:

[mag,phase,wout] = bode(sys)

In this example, ‘wout’ are, from the documentation:

• Response frequencies, returned as a row vector of frequency points. Frequency values are in radians per TimeUnit, where TimeUnit is the value of the TimeUnit property of sys.

[Zhe Liu]

should frequency resolution be a value not a vector? Like fourier where resolution is just 1/window but in bode I really don't know....may be calculated by time step and transfer function?

[Star Strider]

If you use a different syntax, the frequencies can be a vector argument (here ‘w’), giving the magnitude and phase as outputs:

[mag,phase] = bode(sys,w);

The frequency values are in radians per TimeUnit.

See the documentation for bode for details.