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  \code{is.integer} returns \code{TRUE} or \code{FALSE} depending on
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  \code{is.integer} returns \code{TRUE} or \code{FALSE} depending on
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  whether its argument is of integer type or not.
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  whether its argument is of integer type or not.
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  \code{is.integer} is generic: you can write methods to handle
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  \code{is.integer} is generic: you can write methods to handle
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  of specific classes of objects, see \link{InternalMethods}.
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  of specific classes of objects, see \link{InternalMethods}.
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  Note that factors are true for \code{is.integer} but false for
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  \code{\link{is.numeric}}.
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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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  Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
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  \emph{The New S Language}.
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  \emph{The New S Language}.
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  Wadsworth \& Brooks/Cole.
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  Wadsworth \& Brooks/Cole.