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  defined by \code{f}.  The assignment forms replace values
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  defined by \code{f}.  The assignment forms replace values
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  corresponding to such a division.  Unsplit reverses the effect of
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  corresponding to such a division.  Unsplit reverses the effect of
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  \code{split}.
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  \code{split}.
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}
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}
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\usage{
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\usage{
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split(x, f, drop = FALSE)
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split(x, f, drop = FALSE, ...)
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split(x, f, drop = FALSE) <- value
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split(x, f, drop = FALSE, ...) <- value
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unsplit(value, f, drop = FALSE)
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unsplit(value, f, drop = FALSE)
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}
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}
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\arguments{
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\arguments{
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  \item{x}{vector or data frame containing values to be divided into groups.}
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  \item{x}{vector or data frame containing values to be divided into groups.}
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  \item{f}{a \dQuote{factor} in the sense that \code{\link{as.factor}(f)}
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  \item{f}{a \dQuote{factor} in the sense that \code{\link{as.factor}(f)}
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    interaction is used for the grouping.}
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    interaction is used for the grouping.}
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  \item{drop}{logical indicating if levels that do not occur should be dropped
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  \item{drop}{logical indicating if levels that do not occur should be dropped
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    (if \code{f} is a \code{factor} or a list).}
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    (if \code{f} is a \code{factor} or a list).}
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  \item{value}{a list of vectors or data frames compatible with a
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  \item{value}{a list of vectors or data frames compatible with a
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    splitting of \code{x}. Recycling applies if the lengths do not match.}
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    splitting of \code{x}. Recycling applies if the lengths do not match.}
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  \item{\dots}{further potential arguments passed to methods.}
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}
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}
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\details{
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\details{
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  \code{split} and \code{split<-} are generic functions with default and
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  \code{split} and \code{split<-} are generic functions with default and
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  \code{data.frame} methods.
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  \code{data.frame} methods.
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