Reproducible dummy example, as to the posting guide. look at unique- you want to subset the data frame on all of the non-unique entries in the species column...
x[x!=unique(x[,"species"]),] Something like that, maybe. If I had some data then I could probably figure it out. Use dput() or fake data to make a cut and paste-able example. HTH, Stephen On Sat, Jun 5, 2010 at 10:00 AM, Adrienne Keller <adrienne.kel...@umontana.edu> wrote: > Hi, I have a data frame with columns as follows: tree species (independent > variable) and several dependent variables (e.g. carbon, nitrogen, > phosphorus). Each row represents one tree sample. Some tree samples are > unique species in the data frame while other species were replicated (i.e. > rows 1,2,3 may be identical for the "tree species" column but have different > values for the other dependent variable columns). I want to create a new > data frame that selects only the tree species that have replicates. In other > words, I want to select all rows that have at least one replicate in the > column "tree species". > > Ideas on how to write such a function? > > Thanks, > > Adrienne Keller > > ______________________________________________ > 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. > -- Stephen Sefick ____________________________________ | Auburn University | | Department of Biological Sciences | | 331 Funchess Hall | | Auburn, Alabama | | 36849 | |___________________________________| | sas0...@auburn.edu | | http://www.auburn.edu/~sas0025 | |___________________________________| Let's not spend our time and resources thinking about things that are so little or so large that all they really do for us is puff us up and make us feel like gods. We are mammals, and have not exhausted the annoying little problems of being mammals. -K. Mullis ______________________________________________ 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.
