> > On Tue, 4 Oct 2011, Sarah Goslee wrote: > > > You asked for pointers, and didn't provide a reproducible example, so I > > offered a pointer. > > Sarah, > > I did not realize that your pointer was to the factor component of the > subset() command. > > I think the most parsimonious thing for me to do is to modify the database > table with a new column of the full stream name, then re-export and re-read > into R.
Hm. I seldom use such approach. In your original request you said you want split your data to smaller data frames based on sites ----- I need to create subsets (as data frames) based on sites, but including all sites on each stream. For example, using the initial site factor shown ------ >From what we know it is difficult to say if there is some common feature in site variable. If it is organised like XY-N you can simply make new variable from first two letters sites <- substr(chemdata$site,1,2) then you can split your data frame according to sites chem.spl <- split(chemdata, sites) and do anything with your splitted data frames organised in list Regards Petr > > Thanks, > > Rich > > ______________________________________________ > 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. ______________________________________________ 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.
