plot.factor {graphics}R Documentation

Plotting Factor Variables

Description

This method is used for factor arguments of the generic plot function, possibly called from the formula method.

If y is missing a 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 class '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), annotation arguments passed to title, and axes = FALSE. None accept type.

See Also

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

Examples

require(grDevices)

plot(state.region)

## called from the formula method
plot(~ group, data = PlantGrowth)
plot(weight ~ group, data = PlantGrowth)           # numeric ~ 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
[Package graphics version 4.6.0 Index]