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Model Poles and Zeros Using the System Identification App

To create a pole-zero plot for parametric linear models in the System Identification app, select theZeros and polescheck box in theModel Viewsarea. For general information about creating and working with plots, seeWorking 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.

下面的表总结了0和两极plot settings.

Zeros and Poles Plot Settings

Action Command
Display the confidence interval.

  • To display the dashed lines on either side of the nominal pole and zero values, selectOptions>Show confidence intervals. Select this option again to hide the confidence intervals.

  • To change the confidence value, selectOptions>Set % confidence level, and choose a value from the list.

  • To enter your own confidence level, selectOptions>Set confidence level>Other. Enter the value as a probability (between 0 and 1) or as the number of standard deviations of a Gaussian distribution.
Show real and imaginary axes. SelectStyle>Re/Im-axes. Select this option again to hide the axes.
Show the unit circle. SelectStyle>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 theChannelmenu.

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