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  Using this for lists is potentially slow, especially if the elements
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  Using this for lists is potentially slow, especially if the elements
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  are not atomic vectors (see \code{\link{vector}}) or differ only
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  are not atomic vectors (see \code{\link{vector}}) or differ only
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  in their attributes.  In the worst case it is \eqn{O(n^2)}.
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  in their attributes.  In the worst case it is \eqn{O(n^2)}.
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}
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}
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\references{
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\references{
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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\seealso{\code{\link{unique}}.}
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\seealso{\code{\link{unique}}.}
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\examples{
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\examples{
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x <- c(9:20, 1:5, 3:7, 0:8)
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x <- c(9:20, 1:5, 3:7, 0:8)
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## extract unique elements
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## extract unique elements