Plot Impulse and Step Response Using the System Identification App
To create a transient analysis plot in the System Identification app, select the Transient resp check box in the Model Views area. For general information about creating and working with plots, see Working with Plots.
To include or exclude a model on the plot, click the corresponding model icon in the System Identification app. Active models display a thick line inside the Model Board icon.
The following table summarizes the Transient Response plot settings.
Transient Response Plot Settings
|Display step response for linear or nonlinear model.|
Select Options > Step response.
|Display impulse response for linear model.|
Select Options > Impulse response.
Not available for nonlinear models.
Display the confidence interval.
Only available for linear models.
Change time span over which the impulse or step response is calculated. For a scalar time span T, the resulting response is plotted from -T/4 to T.
To change the time span of models you estimated using correlation analysis models, select Estimate > Correlation models and reestimate the model using a new time span.
Toggle between line plot or stem plot.
Use a stem plot for displaying impulse response.
Select Style > Line plot or Style > Stem plot.
(Multiple-output system only)
Select an input-output pair to view the noise spectrum corresponding to those channels.
Select the output by name in the Channel menu.
If the plotted models include a noise
model, you can display the transient response properties associated
with each output channel. The name of the channel has the format
(Step response for nonlinear models only)
Set level of the input step.
For multiple-input models, the input-step level applies only to the input channel you selected to display in the plot.
Select Options > Step Size, and then chose from two options: