Discrete-Time Numeric Models

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Create Discrete-Time Transfer Function Model

This example shows how to create a discrete-time transfer function model using tf.

Create the transfer function G(with)=withwith2−2z−6 with a sample time of 0.1 s.

num = [1 0];
den = [1-2 -6];
Ts = 0.1;
G = tf (num, den, Ts)

num and den are the numerator and denominator polynomial coefficients in descending powers of z. G is a tf model object.

The sample time is stored in the Ts property of G. Access the sample time Ts, using dot notation:

G.Ts

Other Model Types in Discrete Time Representations

Create discrete-time zpk, ss, and frd models in a similar way to discrete-time transfer functions, by appending a sample time to the input arguments. For examples, see the reference pages for those commands.

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