a numeric vector of length 2 specifying the minimum and maximum
value to be plotted.
style
a character indicating the style of axis, as in the
par command.
Possible values are
"r",
"i",
"e", or
"s".
n.ticks
a numeric vector indicating the approximate desired tick marks at
each of the
tick.levels.
tick.levels
a vector of character strings indicating which
tick marks are to be displayed.
Up to three types of tick marks are supported:
"small",
"medium", and
"big".
label.level
a character string (length 1) indicating at which
type of tick mark the tick labels are to be displayed.
The possible choices are the elements of
tick.levels.
las
a number indicating the orientation of the labels with respect to the
axis:
las=0 corresponds to always parallel to the axis,
las=1 corresponds to always horizontal,
and
las=2 corresponds to always perpendicular to the axis.
side
an integer specifying the side on which the axis is to be placed:
1 for bottom, 2 for left, 3 for top or 4 for right.
digits
the number of digits in the formatted label.
reference.grids
if
TRUE, reference grids are generated.
log.axis
if
TRUE, make a logarithmic axis, making
the tick, label, and grid placements in
log coordinates, and the spacing "pretty" in log space.
pi.divide
if
TRUE, make axis labels be e.g.
"2 pi" instead of
6.28,
and place them at "pretty" pi values.
at
if not
NULL, put ticks and labels
for the tick level given by
level.label
at these values, instead of calculating "pretty" values. Note that this
does not override
ylim,
so your ticks are not guaranteed to fall inside the plot.
labels
if not
NULL, and
at != NULL as well,
this character vector is used for the labels instead of formatting the
tick positions.
VALUE:
a list with components
ticks
information for rendering the tick marks.
labels
information for rendering the tick labels.
grid
information for rendering the reference grid lines.