tf

Constructs a transfer function model.

Syntax

• sys = tf()
• sys = tf('s')
• sys = tf(numerator, denominator)
• sys = tf(numerator, denominator, Ts)

Input argument

• numerator - polynomial coefficients: a row vector or as a cell array of row vectors.
• denominator - polynomial coefficients: a row vector or as a cell array of row vectors.
• Ts - Sampling time Ts, default: in seconds
• sysIn - LTI model.

Output argument

• sys - Output tranfer function system model.

Description

sys = tf(numerator, denominator) is used to create a continuous-time transfer function model.

It is defined by specifying numerator and denominator of the transfer function.

When you include the Ts parameter, it allows you to create a discrete-time transfer function.

Setting Ts to -1 indicates an unspecified sampling time, and, in this scenario, the input arguments are treated as if they pertain to a continuous-time system.

Examples

numerator = 10;
denominator = [20, 33, 44];
sys = tf(numerator, denominator)

numerator = 10;
denominator = [20, 33, 44];
Ts = 1.5;
sys = tf(numerator, denominator, Ts)

See also

ss.

History

Author

Allan CORNET