plot.factor               package:base               R Documentation

Plotting Factor Variables

Description:

     This functions implements a ``scatterplot'' method for `factor'
     arguments of the generic `plot' function. Actually, `boxplot' or
     `barplot' are used when appropriate.

Usage:

     plot.factor(x, y, legend.text = levels(y), ...)

Arguments:

     x,y: numeric or factor.  `y' may be missing.

legend.text: a vector of text used to construct a legend for the plot.
          Only used if `y' is present and a factor.

     ...: Further arguments to `plot', see also `par'.

See Also:

     `plot.default', `plot.formula', `barplot', `boxplot'.

Examples:

     data(PlantGrowth)
     plot(PlantGrowth)                                # -> plot.data.frame
     plot(weight ~ group, data = PlantGrowth)         # numeric vector ~ factor
     plot(cut(weight, 2) ~ group, data = PlantGrowth) # factor ~ factor

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

