How to subset() from data frame using specific rows
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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