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}
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}
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\value{
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\value{
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  \code{numeric} creates a real vector of the specified length.  The
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  \code{numeric} creates a real vector of the specified length.  The
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  elements of the vector are all equal to \code{0}.
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  elements of the vector are all equal to \code{0}.
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  \code{as.numeric} attempts to coerce its argument to numeric type
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  \code{as.numeric} attempts to coerce its argument to a numeric \link{type}
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  (either integer or real).
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  (either integer or real).
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  \code{as.numeric} for factors yields the codes underlying the factor
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  \code{as.numeric} for factors yields the codes underlying the factor
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    levels, not the numeric representation of the labels.
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  levels, not the numeric representation of the labels.
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  \code{is.numeric} returns \code{TRUE} if its argument is of type numeric
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  \code{is.numeric} returns \code{TRUE} if its argument is of
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  \link{mode} \code{"numeric"} (\link{type} \code{"double"} or type
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  or type integer and \code{FALSE} otherwise.
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  \code{"integer"}) and not a factor, and \code{FALSE} otherwise.
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}
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}
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\note{
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\note{
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  \emph{\R has no single precision data type.  All real numbers are
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  \emph{\R has no single precision data type.  All real numbers are
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    stored in double precision format}.
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    stored in double precision format}.