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  \item{\dots}{a sequence of numeric, character or logical
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  \item{\dots}{a sequence of numeric, character or logical
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    vectors, all of the same length, or a classed \R object.}
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    vectors, all of the same length, or a classed \R object.}
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}
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}
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\details{
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\details{
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  The function partially sorts the elements so that identical values are
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  The function partially sorts the elements so that identical values are
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  adjacent. \code{NA} values come first.  This is guaranteed to be
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  adjacent. \code{NA} values come last.  This is guaranteed to be
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  stable, so ties are preserved, and if the data are already
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  stable, so ties are preserved, and if the data are already
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  grouped/sorted, the grouping is unchanged.  This is useful for
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  grouped/sorted, the grouping is unchanged.  This is useful for
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  aggregation and is particularly fast for character vectors.
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  aggregation and is particularly fast for character vectors.
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  Under the covers, the \code{"radix"} method of \code{\link{order}} is
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  Under the covers, the \code{"radix"} method of \code{\link{order}} is
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  used, and the same caveats apply, including reduced precision when
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  used, and the same caveats apply, including restrictions on character
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  comparing real values, restrictions on character encodings and lack of
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  encodings and lack of support for long vectors (those with
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  support for long vectors (those with \eqn{2^{31}}{2^31} or more elements).
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  \eqn{2^{31}}{2^31} or more elements). Real-valued numbers are slightly
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  rounded to account for numerical imprecision.
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  Like \code{order}, for a classed \R object the grouping is based on
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  Like \code{order}, for a classed \R object the grouping is based on
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  the result of \code{\link{xtfrm}}.
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  the result of \code{\link{xtfrm}}.
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}
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}
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