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pzoptions

Create list of pole/zero plot options

Syntax

P = pzoptions
P = pzoption('cstprefs')

Description

P = pzoptions returns a list of available options for pole/zero plots (pole/zero, input-output pole/zero and root locus) with default values set.. You can use these options to customize the pole/zero plot appearance from the command line.

P = pzoption('cstprefs') initializes the plot options with the options you selected in the Control System Toolbox™ Preferences Editor. For more information about the editor, see Toolbox Preferences Editor in the User's Guide documentation.

This table summarizes the available pole/zero plot options.

OptionDescription
Title, XLabel, YLabelLabel text and style
TickLabelTick label style
Grid Show or hide the grid
Specified as one of the following strings: 'off' | 'on'
Default: 'off'
XlimMode, YlimMode Limit modes
Xlim, YlimAxes limits
IOGrouping Grouping of input-output pairs
Specified as one of the following strings: 'none' |'inputs'|'output'|'all'
Default: 'none'
InputLabels, OutputLabels Input and output label styles
InputVisible, OutputVisibleVisibility of input and output channels
FreqUnits

Frequency units, specified as one of the following strings:

  • 'Hz'

  • 'rad/second'

  • 'rpm'

  • 'kHz'

  • 'MHz'

  • 'GHz'

  • 'rad/nanosecond'

  • 'rad/microsecond'

  • 'rad/millisecond'

  • 'rad/minute'

  • 'rad/hour'

  • 'rad/day'

  • 'rad/week'

  • 'rad/month'

  • 'rad/year'

  • 'cycles/nanosecond'

  • 'cycles/microsecond'

  • 'cycles/millisecond'

  • 'cycles/hour'

  • 'cycles/day'

  • 'cycles/week'

  • 'cycles/month'

  • 'cycles/year'

Default: 'rad/s'

You can also specify 'auto' which uses frequency units rad/TimeUnit relative to system time units specified in the TimeUnit property. For multiple systems with different time units, the units of the first system are used.

TimeUnits

Time units, specified as one of the following strings:
  • 'nanoseconds'

  • 'microseconds'

  • 'milliseconds'

  • 'seconds'

  • 'minutes'

  • 'hours'

  • 'days'

  • 'weeks'

  • 'months'

  • 'years'

Default: 'seconds'

You can also specify 'auto' which uses time units specified in the TimeUnit property of the input system. For multiple systems with different time units, the units of the first system is used.

ConfidenceRegionNumberSD

Number of standard deviations to use when displaying the confidence region characteristic for identified models (valid only iopzplot).

Examples

In this example, you enable the grid option before creating a plot.

 P = pzoptions; % Create set of plot options P
 P.Grid = 'on'; % Set the grid to on in options
 h = rlocusplot(tf(1,[1,.2,1,0]),P); 

The following root locus plot is created with the grid enabled.

See Also

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