[R] logical and NA

[Thomas Lumley]

On Wed, 4 Sep 2002, Christian Hoffmann wrote:

> Hi there, (sorry Martin, ich habe den falschen Empfaenger erwischt :-(  )
>
> Is there a function in the base package or elsewhere which returns TRUE and
> not NA, even if NA is involved: (I did not find in the help system :-(  )
>
> if ( x==something & !is.na(something))
>
> or
>
> if ( x==something & !is.na(x==something))
>

x %in% something
is TRUE if x is an element of something and FALSE otherwise, so your first
example could be
   if (x %in% something)

	-thomas

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