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  \code{as.double} attempts to coerce its argument to be of double
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  \code{as.double} attempts to coerce its argument to be of double
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  type: like \code{\link{as.vector}} it strips attributes including names.
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  type: like \code{\link{as.vector}} it strips attributes including names.
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  \code{is.double} returns \code{TRUE} or \code{FALSE} depending on
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  \code{is.double} returns \code{TRUE} or \code{FALSE} depending on
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  whether its argument is of double type or not.  It is generic:
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  whether its argument is of double type or not.  It is generic:
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  you can write methods to handle of specific classes of objects,
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  you can write methods to handle specific classes of objects,
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  see \link{InternalMethods}.
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  see \link{InternalMethods}.
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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}.  The functions \code{as.single}
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    stored in double precision format}.  The functions \code{as.single}