graphics (version 3.4.0)

plot.factor: Plotting Factor Variables

Description

This functions implements a scatterplot method for factor arguments of the generic plot function.

If y is missing barplot is produced. For numeric y a boxplot is used, and for a factor y a spineplot is shown. For any other type of y the next plot method is called, normally plot.default.

Usage

# S3 method for factor
plot(x, y, legend.text = NULL, …)

Arguments

x, y

numeric or factor. y may be missing.

legend.text

character vector for annotation of y axis in the case of a factor y: defaults to levels(y). This sets the yaxlabels argument of spineplot.

…

Further arguments to barplot, boxplot, spineplot or plot as appropriate. All of these accept graphical parameters (see par) and annotation arguments passed to title and axes = FALSE. None accept type.

See Also

plot.default, plot.formula, barplot, boxplot, spineplot.

Examples

require(grDevices)
<!-- % this does not call plot.factor! -->
<!-- % plot(PlantGrowth)                                # -> plot.data.frame -->
plot(weight ~ group, data = PlantGrowth)           # numeric vector ~ factor
plot(cut(weight, 2) ~ group, data = PlantGrowth)   # factor ~ factor
## passing "..." to spineplot() eventually:
plot(cut(weight, 3) ~ group, data = PlantGrowth,
     col = hcl(c(0, 120, 240), 50, 70))

plot(PlantGrowth$group, axes = FALSE, main = "no axes")  # extremely silly