Usage
panel.barchart(x, y, box.ratio = 1, box.width,
horizontal = TRUE,
origin = NULL, reference = TRUE,
stack = FALSE,
groups = NULL,
col = if (is.null(groups)) plot.polygon$col
else superpose.polygon$col,
border = if (is.null(groups)) plot.polygon$border
else superpose.polygon$border,
lty = if (is.null(groups)) plot.polygon$lty
else superpose.polygon$lty,
lwd = if (is.null(groups)) plot.polygon$lwd
else superpose.polygon$lwd,
...)Arguments
x
Extent of Bars. By default, bars start at left of panel,
unless origin is specified, in which case they start there
y
Horizontal location of bars, possibly factor
box.ratio
ratio of bar width to inter-bar space
box.width
thickness of bars in absolute units; overrides
box.ratio. Useful for specifying thickness when the
categorical variable is not a factor, as use of box.ratio
alone cannot achieve a thickness greater than 1.
horizontal
logical. If FALSE, the plot is transposed in the sense that
the behaviours of x and y are switched. x is now the
factor. Interpretation of other arguments change
accordingly. See documentation of
origin
the origin for the bars. For grouped displays with
stack = TRUE, this argument is ignored and the origin set to
0. Otherwise, defaults to NULL, in which case bars start at
the left (or bottom) end of a panel. This
reference
logical, whether a reference line is to be drawn at
the origin
stack
logical, relevant when groups is non-null. If
FALSE (the default), bars for different values of the
grouping variable are drawn side by side, otherwise they are
stacked.
groups
optional grouping variable
col, border, lty, lwd
Graphical parameters for the bars. By default, the trellis parameter
plot.polygon is used if there is no grouping variable, otherwise
superpose.polygon is used. col gives the fill color,
border
...
extra arguments will be accepted but ignored