Control System Toolbox Function Reference

gensig

Generate test input signals for lsim

Syntax

[u,t] = gensig(type,tau)
[u,t] = gensig(type,tau,Tf,Ts)

Description

[u,t] = gensig(type,tau) generates a scalar signal u of class type and with period tau (in seconds). The following types of signals are available.

type = 'sin'	Sine wave.
type = 'square'	Square wave.
type = 'pulse'	Periodic pulse.

gensig returns a vector t of time samples and the vector u of signal values at these samples. All generated signals have unit amplitude.

[u,t] = gensig(type,tau,Tf,Ts) also specifies the time duration Tf of the signal and the spacing Ts between the time samples t.

You can feed the outputs u and t directly to lsim and simulate the response of a single-input linear system to the specified signal. Since t is uniquely determined by Tf and Ts, you can also generate inputs for multi-input systems by repeated calls to gensig.

Example

Generate a square wave with period 5 seconds, duration 30 seconds, and sampling every 0.1 seconds.

[u,t] = gensig('square',5,30,0.1)

Plot the resulting signal.

plot(t,u)
axis([0 30 -1 2])

See Also
lsim        Simulate response to arbitrary inputs

freqresp

get