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\name{plot.factor}
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\title{Plotting Factor Variables}
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\usage{
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\method{plot}{factor}(x, y, legend.text = NULL, \dots)
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}
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\alias{plot.factor}
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\arguments{
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    \item{x, y}{numeric or factor. \code{y} may be missing.}
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    \item{legend.text}{character vector for annotation of y axis,
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      defaults to \code{levels(y)}. Can be used instead of \code{yaxlabels}
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      (for backward compatibility).}
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    \item{\dots}{Further arguments to \code{\link{plot}}, see also
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        \code{\link{par}}.}
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}
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\description{
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  This functions implements a \dQuote{scatterplot} method for
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  \code{\link{factor}} arguments of the \emph{generic}
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  \code{\link{plot}} function.
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  Actually, \code{\link{boxplot}} is used when \code{y} is numeric
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  and a \code{\link{spineplot}} when \code{y} is a factor. For
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  a single factor \code{x} (i.e., with \code{y} missing) a simple
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  \code{\link{barplot}} is produced.
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}
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\seealso{
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    \code{\link{plot.default}}, \code{\link{plot.formula}},
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    \code{\link{barplot}}, \code{\link{boxplot}}, \code{\link{spineplot}}.
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}
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\examples{
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require(grDevices)
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plot(PlantGrowth)                                # -> plot.data.frame
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plot(weight ~ group, data = PlantGrowth)         # numeric vector ~ factor
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plot(cut(weight, 2) ~ group, data = PlantGrowth) # factor ~ factor
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## passing "..." to spineplot() eventually:
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plot(cut(weight, 3) ~ group, data = PlantGrowth,
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     col = hcl(c(0, 120, 240), 50, 70))
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plot(PlantGrowth$group, axes=FALSE, main="no axes")# extremely silly
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}
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\keyword{hplot}