Specifications

step
16-215
16step
Purpose Step response of LTI systems
Syntax step(sys)
step(sys,t)
step(sys1,sys2,...,sysN)
step(sys1,sys2,...,sysN,t)
step(sys1,'PlotStyle1',...,sysN,'PlotStyleN')
[y,t,x] = step(sys)
Description step calculates the unit step response of a linear system. Zero initial state is
assumedin thestate-spacecase.When invokedwithnooutputarguments,this
function plots the step response on the screen.
step(sys) plots the step response of an arbitrary LTI model sys.Thismodel
can be continuous or discrete, and SISO or MIMO. The step response of
multi-input systems is the collection of step responses for each input channel.
The duration of simulation is determined automatically based on the system
poles and zeros.
step(sys,t) sets the simulation horizon explicitly. You can specify either a
final time
t = Tfinal (in seconds), or a vector of evenly spaced time samples
of the form
t = 0:dt:Tfinal
For discrete systems, the spacing dt should match the sample period. For
continuous systems,
dt becomes the sample time of the discretized simulation
model (see “Algorithm”), so make sure to choose
dt small enough to capture
transient phenomena.
To plot the step responses of several LTI models
sys1,..., sysN on a single
figure, use
step(sys1,sys2,...,sysN)
step(sys1,sys2,...,sysN,t)