[R] How to subset() from data frame using specific rows

[R. Michael Weylandt]

No, that was just a typo on my end:

the correct order of arguments should have been

ff <- grepl("BC-", ff)

On Tue, Oct 4, 2011 at 3:07 PM, Rich Shepard <rshepard at appl-ecosys.com> wrote:
> On Tue, 4 Oct 2011, R. Michael Weylandt wrote:
>
>> This isn't going to be the most elegant, but it should work:
>> ## Get the factors as characters
>> ff <- as.character(chemdata$site)
>>>
>>> ## Identify those that match what you want
>>
>> ff <- grepl(ff, "BC-")
>
> Michael,
>
>  Apparently grep works differently in R than it does on the command line:
>
> bf <- grep(ff, "BC-")
> Warning message:
> In grep(ff, "BC-") :
>  argument 'pattern' has length > 1 and only the first element will be used
>
>  I understand what you suggest but it does not appear to work for me.
>
> Thanks,
>
> Rich
>
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