[R] grep

[Thomas Lumley]

On Thu, 24 Jan 2002, R. Heberto Ghezzo wrote:

> Hello, I have a problem with 'grep'
> I read several lines from a file
>  p <- readLines(pfile,n=8)
> now I have to check that a key word "JABBERWOCKY" is not in that segment
>
> a <- grep("JABBERWOCKY",p)
> which gives a 1 if the key is in the text or 'numeric(0)
> how can I test it

if (length(a))
	a is 1
else
	a is numeric(0)



	-thomas

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