On Sun, Oct 26, 2008 at 8:06 PM, Duncan Murdoch <[EMAIL PROTECTED]>wrote:
> On 26/10/2008 11:54 AM, John Lande wrote:
>
>> dear all,
>>
>> I have a little problem I am doing a loop, witha grep function. sometimes
>> it
>> happens that have the following results
>>
>> tmp <- grep("x", y)
>>> tmp
>>>
>> integer(0)
>>
>>
>> how can I recognise this outcome? is.na is not working of course, so what
>> else?
>>
>
> length(integer(0)) is zero. If you get any matches, you'll get a longer
> result.
>
> Duncan Murdoch
thank you all,
both the strategies works fine
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
