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  \code{is.nan} tests if a numeric value is \code{NaN}.  Do not test
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  \code{is.nan} tests if a numeric value is \code{NaN}.  Do not test
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  equality to \code{NaN}, or even use \code{\link{identical}},
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  equality to \code{NaN}, or even use \code{\link{identical}},
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  since systems typically have many different NaN values.
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  since systems typically have many different NaN values.
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  In most ports of \R one of these is used for the numeric missing
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  In most ports of \R one of these is used for the numeric missing
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  value \code{NA}.  It is generic: you can write methods to handle
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  value \code{NA}.  It 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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}
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}
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\note{
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\note{
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  In \R, basically all mathematical functions (including basic
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  In \R, basically all mathematical functions (including basic
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  \code{\link{Arithmetic}}), are supposed to work properly with
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  \code{\link{Arithmetic}}), are supposed to work properly with
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  \code{+/- Inf} and \code{NaN} as input or output.
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  \code{+/- Inf} and \code{NaN} as input or output.
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}
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}
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\references{
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\references{
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%%- better ones ?!??
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%%- better ones ?!??
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    ANSI/IEEE 754 Floating-Point Standard.
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    ANSI/IEEE 754 Floating-Point Standard.
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- 
 
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 This link does not work any more (2003/12)
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    Currently (6/2002), Bill Metzenthen's \email{billm@suburbia.net} tutorial
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    Currently (6/2002), Bill Metzenthen's \email{billm@suburbia.net} tutorial
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    and examples at \cr \url{http://www.suburbia.net/~billm/}
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    and examples at \cr \url{http://www.suburbia.net/~billm/}
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}
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}
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\examples{
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\examples{
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pi / 0 ## = Inf a non-zero number divided by zero creates infinity
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pi / 0 ## = Inf a non-zero number divided by zero creates infinity