grid.xaxis {grid} | R Documentation |
These functions create and draw an x-axis.
grid.xaxis(at = NULL, label = TRUE, main = TRUE, edits = NULL, name = NULL, gp = gpar(), draw = TRUE, vp = NULL) xaxisGrob(at = NULL, label = TRUE, main = TRUE, edits = NULL, name = NULL, gp = gpar(), vp = NULL)
at |
A numeric vector of x-value locations for the tick marks. |
label |
A logical value indicating whether to draw the labels
on the tick marks, or an expression or string vector which
specify the labels to use. If not logical, must be the same
length as the at argument. |
main |
A logical value indicating whether to draw the axis
at the bottom (TRUE ) or at the top (FALSE ) of the
viewport. |
edits |
A gEdit or gEditList containing edit operations
to apply (to the children of the axis)
when the axis is first created and during redrawing
whenever at is NULL .
|
name |
A character identifier. |
gp |
An object of class gpar , typically the output
from a call to the function gpar . This is basically
a list of graphical parameter settings. |
draw |
A logical value indicating whether graphics output should be produced. |
vp |
A Grid viewport obect (or NULL ). |
Both functions create an xaxis grob (a graphical object describing an
xaxis), but only grid.xaxis
draws the xaxis (and then only if draw
is TRUE
).
An xaxis grob. grid.xaxis
returns the value invisibly.
If the at
slot of an xaxis grob is not NULL
then
the xaxis will have the following children:
If the at
slot is NULL
then there are no children
and ticks are drawn based on the current viewport scale.
Paul Murrell