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  \code{is.numeric} returns \code{TRUE} if its argument is of type real
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  \code{is.numeric} returns \code{TRUE} if its argument is of type real
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  or type integer and \code{FALSE} otherwise.
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  or type integer and \code{FALSE} otherwise.
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}
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}
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\details{
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\details{
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  \code{is.numeric} is  generic: you can write methods to handle
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  \code{is.numeric} is  generic: you can write methods to handle
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  of specific classes of objects, see \link{InternalMethods}.
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  specific classes of objects, see \link{InternalMethods}.
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  Note that factors are false for \code{is.numeric} but true for
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  Note that factors are false for \code{is.numeric} but true for
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  \code{\link{is.integer}}.
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  \code{\link{is.integer}}.
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}
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}
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