Re: [R] NA=NA

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From: ripley@stats.ox.ac.uk
Date: Sat 29 Jun 2002 - 18:54:50 EST 

Message-id: <Pine.LNX.4.31.0206290952480.23376-100000@gannet.stats>

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@maf.vu.lt
>
>
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-- 
Brian D. Ripley,                  ripley@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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