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  \code{is.integer(x)} does \bold{not} test if \code{x} contains integer
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  \code{is.integer(x)} does \bold{not} test if \code{x} contains integer
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  numbers!  For that, use \code{\link{round}}, as in the function
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  numbers!  For that, use \code{\link{round}}, as in the function
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  \code{is.wholenumber(x)} in the examples.
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  \code{is.wholenumber(x)} in the examples.
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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{
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\seealso{
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  \code{\link{numeric}}, \code{\link{storage.mode}}.
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  \code{\link{numeric}}, \code{\link{storage.mode}}.
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  \code{\link{round}} (and \code{ceiling} and \code{floor} on that help
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  \code{\link{round}} (and \code{ceiling} and \code{floor} on that help