Time-Domain Responses of Discrete-Time Model

This example shows how to obtain a step response and step response data for a discrete-time dynamic system model.

You can use the techniques of this example with commands such as impulse, initial, impulseplot, and initialpot to obtain time-domain responses of discrete-time models. Obtaining time-domain responses of discrete-time models is the same as for continuous-time models, except that the time sample points are limited by the sampling time Ts of the model.

Create a discrete-time transfer function model and plot its response to a step input at t = 0.

H = tf([-0.06,0.4],[1,-1.6,0.78],0.1);
stepplot(H)

For discrete-time models, stepplot plots the response at multiples of the sampling period, assuming a hold between samples.

Compute the step response of H between 0.5 and 2.5 seconds.

[y,t] = step(H,0.5:0.1:2.5);

When you specify a time vector for the response of a discrete-time model, the time step must match the sampling time Ts of the discrete-time model. The vector t contains the time points between 0.5 and 2.5 seconds, at multiples of the sampling time of H, 0.1 s. The vector y contains the corresponding step response values.

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