pzoptions
Options for pole-zero plots
Description
Use the pzoptions
command to create a
PZOptions
object to customize the appearance of pole-zero plots. Use this
object to customize the appearance of plots created using pzplot
, iopzplot
, or rlocusplot
and override the plot preferences
for the MATLAB® session in which you create the pole-zero plot.
The options you specify for a PZOptions
object correspond to properties
of the PZPlot
, IOPZPlot
, or
RLocusPlot
chart
object.
Creation
Description
returns a default
set of plot options for use with plotoptions
= pzoptionspzplot
, iopzplot
, and rlocusplot
. You can use these options to
customize the pole-zero plot appearance using the command line. This syntax is useful when
you want to write a script to generate plots that look the same regardless of the
preference settings of the MATLAB session in which you run the script.
initializes
the plot options with the options you selected in the Control System Toolbox™ and System Identification Toolbox™ preferences editor. For more information about the editor, see Specify Toolbox Preferences for Linear Analysis Plots. This syntax is useful when you
want to change a few plot options but otherwise use your default preferences. A script
that uses this syntax can generate results that look different when run in a session with
different preferences.plotoptions
= pzoptions("cstprefs")
Properties
Confidence Region
ConfidenceRegionNumberSD
— Number of standard deviations to use to plot the confidence region
1
(default) | scalar
Number of standard deviations to use to plot the confidence region, specified as a
scalar. This is applicable to identified models only. This option is ignored by
pzplot
and rlocusplot
.
This option corresponds to the
Characteristics.ConfidenceRegion.NumberOfStandardDeviations
property of the chart object.
Units
FreqUnits
— Frequency units
'rad/s'
(default) | 'Hz'
| 'rpm'
| 'auto'
| ...
Frequency units, specified as one of the following values:
'Hz'
'rad/s'
'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'
You can also specify 'auto'
which uses frequency
'rad/TimeUnit'
, where TimeUnit
is the
TimeUnit
property of the input system.
This option corresponds to the FrequencyUnit
property of the chart object.
TimeUnits
— Time units
'seconds'
(default) | 'milliseconds'
| 'minutes'
| 'auto'
| ...
Time units, specified as one of the following values:
'nanoseconds'
'microseconds'
'milliseconds'
'seconds'
'minutes'
'hours'
'days'
'weeks'
'months'
'years'
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 are used.
This option corresponds to the TimeUnit
property of the chart
object.
Inputs and Outputs
Input and output options are supported only for iopzmap
plots.
IOGrouping
— Grouping of input-output pairs
'none'
(default) | 'inputs'
| 'outputs'
| 'all'
Grouping of input-output (I/O) pairs, specified as one of the following:
'none'
— Do not group inputs or outputs.'inputs'
— Group only inputs.'outputs'
— Group only outputs.'all'
— Group all input-output pairs.
This option corresponds to the IOGrouping
property of the
chart object.
InputLabels
— Input label style
structure
Input label style, specified as a structure with the following fields:
FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or'italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is dark grey with the RGB triplet[0.4,0.4,0.4]
.Interpreter
— Text interpreter, specified as one of these values:'tex'
— Interpret characters using a subset of TeX markup. This is the default value ofInterpreter
.'latex'
— Interpret characters using LaTeX markup.'none'
— Display literal characters.
OutputLabels
— Output label style
structure
Output label style, specified as a structure with the following fields:
FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or ''italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is dark grey with the RGB triplet[0.4,0.4,0.4]
.Interpreter
— Text interpreter, specified as one of these values:'tex'
— Interpret characters using a subset of TeX markup. This is the default value ofInterpreter
.'latex'
— Interpret characters using LaTeX markup.'none'
— Display literal characters.
InputVisible
— Option to display inputs
{'on'}
(default) | {'off'}
| cell array
Option to display inputs, specified as {'on'}
,
{'off'}
, or a cell array with multiple elements.
This option corresponds to the InputVisible
property of the
chart object.
OutputVisible
— Option to display outputs
{'on'}
(default) | {'off'}
| cell array
Option to display outputs, specified as {'on'}
,
{'off'}
, or a cell array with multiple elements.
This option corresponds to the OutputVisible
property of the
chart object.
Title and Axis Labels
Title
— Title text and style
structure
Title text and style, specified as a structure with the following fields:
String
— Label text, specified as a character vector. By default, the plot is titled 'Bode Diagram'.FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or'italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is black specified by the RGB triplet[0,0,0]
.Interpreter
— Text interpreter, specified as one of these values:'tex'
— Interpret characters using a subset of TeX markup. This is the default value ofInterpreter
.'latex'
— Interpret characters using LaTeX markup.'none'
— Display literal characters.
This option corresponds to the Title
property of the chart object.
XLabel
— X-axis label text and style
structure
X-axis label text and style, specified as a structure with the following fields:
String
— Label text, specified as a character vector. By default, the axis is titled based on the frequency unitsFreqUnits
.FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or'italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is black specified by the RGB triplet[0,0,0]
.Interpreter
— Text interpreter, specified as one of these values:'tex'
— Interpret characters using a subset of TeX markup. This is the default value ofInterpreter
.'latex'
— Interpret characters using LaTeX markup.'none'
— Display literal characters.
This option corresponds to the XLabel
property of the chart object.
YLabel
— Y-axis label text and style
structure
Y-axis label text and style, specified as a structure with the following fields:
String
— Label text, specified as a cell array of character vectors. By default, the axis label is a 1x2 cell array with 'Magnitude' and 'Phase'.FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or'italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is black specified by the RGB triplet[0,0,0]
.Interpreter
— Text interpreter, specified as one of these values:'tex'
— Interpret characters using a subset of TeX markup. This is the default value ofInterpreter
.'latex'
— Interpret characters using LaTeX markup.'none'
— Display literal characters.
This option corresponds to the YLabel
property of the chart object.
TickLabel
— Tick label style
structure
Tick label style, specified as a structure with the following fields:
FontSize
— Font size, specified as a scalar value greater than zero in point units. The default font size depends on the specific operating system and locale. One point equals1/72
inch.FontWeight
— Character thickness, specified as'Normal'
or'bold'
. MATLAB uses theFontWeight
property to select a font from those available on your system. Not all fonts have a bold weight. Therefore, specifying a bold font weight can still result in the normal font weight.FontAngle
— Character slant, specified as'Normal'
or'italic'
. Not all fonts have both font styles. Therefore, the italic font might look the same as the normal font.Color
— Text color, specified as an RGB triplet. The default color is black specified by the RGB triplet[0,0,0]
.
Grid
Grid
— Toggle grid display
'off'
(default) | 'on'
Toggle grid display on the plot, specified as either 'off
' or 'on
'.
This option corresponds to the GridVisible
property of the chart object.
GridColor
— Color of the grid lines
[0.15 0.15 0.15]
(default) | RGB triplet
Color of the grid lines, specified as an RGB triplet. The default color is light grey specified by the RGB triplet [0.15 0.15 0.15]
.
Axis Limits
XLimMode
— X-axis limit selection mode
'auto'
(default) | 'manual'
| cell array
X-axis limit selection mode, specified as one of the following values:
'auto'
— Enable automatic limit selection, which is based on the total span of the plotted data.'manual'
— Manually specify the axis limits. To specify the axis limits, set theXLim
option.
This option corresponds to the XLimitsMode
property of the chart object.
YLimMode
— Y-axis limit selection mode
'auto'
(default) | 'manual'
| cell array
Selection mode for the y-axis limits, specified as one of these values:
'auto'
— Enable automatic limit selection, which is based on the total span of the plotted data.'manual'
— Manually specify the axis limits. To specify the axis limits, set theYLim
option.
This option corresponds to the YLimitsMode
property of the chart object.
XLim
— X-axis limits
'{[1,10]}'
(default) | cell array of two-element vectors of the form [min,max]
| cell array
X-axis limits, specified as a cell array of two-element vector of the form [min,max]
.
This option corresponds to the XLimits
property of the chart object.
YLim
— Y-axis limits
'{[1,10]}'
(default) | cell array of two-element vector of the form [min,max]
| cell array
Y-axis limits, specified as a cell array of two-element vector of the form [min,max]
.
This option corresponds to the YLimits
property of the chart object.
Object Functions
Examples
Pole-Zero Plot with Custom Options
Plot the poles and zeros of the continuous-time system represented by the following transfer function with a custom option set:
Create the custom option set using pzoptions
.
plotoptions = pzoptions;
For this example, specify the grid to be visible.
plotoptions.Grid = 'on';
Use the specified options to create a pole-zero map of the transfer function.
h = pzplot(tf([2 5 1],[1 3 5]),plotoptions);
Turning on the grid displays lines of constant damping ratio (zeta) and lines of constant natural frequency (wn). This system has two real zeros, marked by o
on the plot. The system also has a pair of complex poles, marked by x
.
Version History
Introduced in R2008a
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