[R] NA=NA

[ripley@stats.ox.ac.uk]

Use is.na().

Since NA denotes unknown, the result is always unknown.


On Sat, 29 Jun 2002, Remigijus Lapinskas wrote:

> Hello R-help,
>
> My vector aa has some NA's:
>
> > aa_c(NA,1)

Oh, please don't post ugly code like that.  If you must use `_' leave
spaces around it (and be aware that it will be deprecated in 1.6.0).

> > aa=="NA"
> [1]    NA FALSE
> > aa==NA
> [1]   NA   NA
>
> How can I detect NA's?
> In other words, I would like my answer to be TRUE  FALSE.
>
> Best regards,
>  Remigijus                          mailto:remigijus.lapinskas at maf.vu.lt
>
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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