This example shows how to obtain step and impulse response data, as well as step and impulse response plots, from a dynamic system model.
Create a transfer function model and plot its response to a step input at t = 0.
H = tf([8 18 32],[1 6 14 24]); step(H);
When call step
without output arguments, it plots the step response on the screen. Unless you specify a time range to plot, step
automatically chooses a time range that illustrates the system dynamics.
Calculate the step response data from t = 0 (application of the step input) to t = 8 s.
[y,t] = step(H,8);
When you call step
with output arguments, the command returns the step response data y
. The vector t
contains corresponding time values.
Plot the response of H
to an impulse input applied at t = 0. Plot the response with a grid.
opts = timeoptions; opts.Grid = 'on'; impulseplot(H,opts)
Use the timeoptions
command to define options sets for customizing time-domain plots with commands like impulseplot
and stepplot
.
Calculate 200 points of impulse response data from t = 1 (one second after application of the impulse input) to t = 3s.
[y,t] = impulse(H,linspace(1,3,200));
As for step
, you can omit the time vector to allow impulse
to automatically select a time range.
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