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3.9 Graphics Functions 355
PlotRange
The meaning of the PlotRange option is the same as for other Mathematica graphics functions, but
the option has slightly different formats.
{{xmin, xmax}, {ymin, ymax}}
{{xmin, xmax}}
value
Automatic or All
specify individual limits for all axes directions
specify plot range for the x-axis.
equivalent to {{−value, value}, {−value, value}}
determine plot range automatically
Values for the PlotRange option.
PoleStyle
With the option PoleStyle −> style, you can change the appearance of the symbol RootLocusPlot
uses to mark poles. The following styles are available:
CrossMark[size, colorfunc, grstyle]
marks a root with a cross
PlusMark[size, colorfunc, grstyle]
marks a root with a plus
CircleMark[size, colorfunc, grstyle]
marks a root with a circle
SquareMark[size, colorfunc, grstyle]
marks a root with a square
PointMark[size, colorfunc, grstyle]
marks a root with a point
Styles for the PoleStyle and ZeroStyle options.
In the above table, size denotes the size of a root marker in scaled coordinates, colorfunc a pure
function that returns a color value for an argument between 0 and 1, and grstyle an additional list of
graphics styles for the root marker. The color function is used to visualize the parameter dependency
of the root.
ZeroStyle
With the option ZeroStyle −> style, you can change the appearance of the symbol RootLocusPlot
uses to mark zeros. For a list of available styles see the description of the PoleStyle option.