[R] return value for grep

[Gabor Grothendieck]

On Sat, Oct 30, 2010 at 10:51 PM, Ulrich <ulrich.schlecht at stanford.edu> wrote:
> Hi,
>
> is it possible to easily change the return value for the grep function for
> cases where there is no match, for example the value 0 or "No" instead of
> integer (0) )?
>

Try this:

> Find(length, list(grep("X", letters), 0))
[1] 0
> Find(length, list(grep("X", LETTERS), 0))
[1] 24


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