[R] isolate elements in vector that match one of many possible values

[Rolf Turner]

On 9/09/2008, at 1:55 PM, Andrew Barr wrote:

> Hi all,
>
> I want to get the index numbers of all elements of a vector which  
> match any
> of a long series of possible values.  Say x <- c(1,2,3,4) and I  
> want to know
> which values are equal to 1, 2 or 4.  I could do
>
> which(x == 1 | x==2 | x==4)
> [1] 1 2 4
>
> This gets really ugly though, when the list of values of interest  
> is really
> long.  Is there a nicer way to do this?

which(x%in%c(1,2,4))

	cheers,

		Rolf Turner

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