R: Draw a Y-Axis

grid.yaxis {grid}

R Documentation

Draw a Y-Axis

Description

These functions create and draw a y-axis.

Usage

grid.yaxis(at = NULL, label = TRUE, main = TRUE, name = NULL, gp  =gpar(),
           draw = TRUE, vp = NULL)
yaxisGrob(at = NULL, label = TRUE, main = TRUE, name = NULL, gp  =gpar(),
          vp = NULL)

Arguments

`at`	A numeric vector of y-value locations for the tick marks.
`label`	A logical value indicating whether to draw the labels on the tick marks.
`main`	A logical value indicating whether to draw the axis at the left (`TRUE`) or at the right (`FALSE`) of the viewport.
`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`).

Details

Both functions create a yaxis grob (a graphical object describing a yaxis), but only grid.yaxis draws the yaxis (and then only if draw is TRUE).

Value

A yaxis grob. grid.yaxis returns the value invisibly.

Children

If the at slot of an xaxis grob is not NULL then the xaxis will have the following children:

major: representing the line at the base of the tick marks.
ticks: representing the tick marks.
labels: representing the tick labels.

If the at slot is NULL then there are no children and ticks are drawn based on the current viewport scale.

Author(s)

Paul Murrell