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\description{
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\description{
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  Produce box-and-whisker plot(s) of the given (grouped) values using
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  Produce box-and-whisker plot(s) of the given (grouped) values using
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  formula notation.
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  formula notation.
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}
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}
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\usage{
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\usage{
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\method{boxplot}{formula}(formula, data = NULL, \dots, subset, na.action)
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\method{boxplot}{formula}(formula, data = NULL, \dots, subset)
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}
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}
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\arguments{
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\arguments{
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  \item{formula}{a formula, such as \code{y ~ x}.}
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  \item{formula}{a formula, such as \code{y ~ x}.}
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  \item{data}{a data.frame (or list) from which the variables in
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  \item{data}{a data.frame (or list) from which the variables in
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    \code{formula} should be taken.}
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    \code{formula} should be taken.}
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  \item{\dots}{arguments to the default boxplot method and graphical
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  \item{\dots}{arguments to the default boxplot method and graphical
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    parameters may also be passed as arguments, see \code{\link{par}}.}
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    parameters may also be passed as arguments, see \code{\link{par}}.}
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  \item{subset}{an optional vector specifying a subset of observations
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  \item{subset}{an optional vector specifying a subset of observations
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    to be used for plotting.}
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    to be used for plotting.}
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  %% <FIXME>
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  %% Remove in 1.4.0.
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  \item{na.action}{deprecated.}
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  %% </FIXME>
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}
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}
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\details{
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\details{
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  This is a method of the generic function \code{\link{boxplot}}.  It
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  This is a method of the generic function \code{\link{boxplot}}.  It
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  operates by setting up the data from the formula specification, and
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  operates by setting up the data from the formula specification, and
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  then calling \code{\link{boxplot.default}}.
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  then calling \code{\link{boxplot.default}}.