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  \code{NULL} represents the null object in \R: it is a \link{reserved}
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  \code{NULL} represents the null object in \R: it is a \link{reserved}
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  word.  \code{NULL} is often returned by expressions and functions
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  word.  \code{NULL} is often returned by expressions and functions
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  whose value is undefined.
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  whose value is undefined.
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  \code{as.null} ignores its argument and returns the value \code{NULL}.
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  \code{as.null} ignores its argument and returns the value \code{NULL}.
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  \code{is.null} returns \code{TRUE} if its argument
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  \code{is.null} returns \code{TRUE} if its argument
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  is \code{NULL} and \code{FALSE} otherwise.
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  is \code{NULL} and \code{FALSE} otherwise.
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}
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}
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\arguments{
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\arguments{
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  \item{x}{an object to be tested or coerced.}
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  \item{x}{an object to be tested or coerced.}