# Frequency domain analysis

Frequency analysis is a powerful tool in system analysis, we can access the properties of the system in frequency domain to reveal the stability, gain margin, phase margin etc.

In FractionalSystems.jl, it is also easy to transform the system to frequency domain:

`julia> freqresp(s, G)`

The `freqresp`

function return the frequency response of the fractional order systems.

In Julia, there are no `logspace(a, b)`

API, we can use `exp10.(range(a, b, length=50))`

instead.

## Bode plot

To generate a bode plot of a FOTF object, we can directly use `bodeplot(g::FOTF)`

to analysis the frequency properties of the FOTF:

`julia> bodeplot(G)`