[R] selecting only specific rows in R

[stephen sefick]

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.keller at 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
>
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> and provide commented, minimal, self-contained, reproducible code.
>



-- 
Stephen Sefick
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