To create a pole-zero plot for parametric linear models in the System Identification Tool GUI, select the Zeros and poles 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 Tool GUI. Active models display a thick line inside the Model Board icon.
The following table summarizes the Zeros and Poles plot settings.
Zeros and Poles Plot Settings
|Display the confidence interval.|
|Show real and imaginary axes.||Select Style > Re/Im-axes. Select this option again to hide the axes.|
|Show the unit circle.||Select Style > Unit circle. Select this option again to hide the unit circle. The unit circle is useful as a reference curve for discrete-time models.|
|(Multiple-output system only)|
Select an input-output pair to view the poles and zeros corresponding to those channels.
|Select the output by name in the Channel menu.|