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}
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}
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\note{
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\note{
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  \code{is.null} is a \link{primitive} function.
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  \code{is.null} is a \link{primitive} function.
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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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  \bibshow{R:Becker+Chambers+Wilks:1988}
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  \emph{The New S Language}.
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  Wadsworth & Brooks/Cole.
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}
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}
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\value{
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\value{
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  \code{as.null} ignores its argument and returns \code{NULL}.
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  \code{as.null} ignores its argument and returns \code{NULL}.
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  \code{is.null} returns \code{TRUE} if its argument's value
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  \code{is.null} returns \code{TRUE} if its argument's value