Frequency Response of a SISO System

This example shows how to plot the frequency response and obtain frequency response data for a single-input, single-output (SISO) dynamic system model.

Create a transfer function model and plot its frequency response.

H = tf([10,21],[1,1.4,26]); 
bodeplot(H)

bodeplot plots the frequency response on the screen. Unless you specify a time range to plot, stepplot automatically chooses a time range that illustrates the system dynamics.

Calculate the frequency response between 1 and 13 rad/s.

 [mag,phase,w] = bode(H,{1,13});

When you call bode with output arguments, the command returns vectors mag and phase containing the magnitude and phase of the frequency response. The cell array input {1,13} tells bode to calculate the response at a grid of frequencies between 1 and 13 rad/s. bode returns the frequency points in the vector w.

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