On Sat, 5 Jun 2010, stephen sefick wrote:
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
Or use one of the built in datasets - there are several that pertain to
trees. Try
??tree
But yes, Adrienne, you should (as per Posting Guide) "provide commented,
minimal, self-contained, reproducible code".
For example:
?Orange # find out about 'Orange' tree dataset
## rows with more than one tree of a given circumference:
subset( Orange, xtabs(~circumference)[ as.character(circumference) ] > 1
)
Tree age circumference
1 1 118 30
4 1 1004 115
6 1 1372 142
13 2 1372 203
14 2 1582 203
15 3 118 30
19 3 1231 115
29 5 118 30
33 5 1231 142
# more detail to suggest why this works:
with( Orange, xtabs(~circumference)[as.character(circumference)] > 1 )
[output deleted]
Chuck
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
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--
Stephen Sefick
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so little or so large that all they really do for us is puff us up and
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annoying little problems of being mammals.
-K. Mullis
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
