Dear R wizes,
I have a data.frame of species abundances with column names consisting
of 4 letter codes then an underscore and a number like this:
abco_1, abco_2, abco_3, psm_1, psme_2, psme_3, etc.
I would like to get an identifier for all the abco, and psme and other
species etc.
I used
spec.fact<-substring(names(spec.count),1,4)
To make a vector of the first 4 letters of each name. I tried using
spec.groups <- unique(spec.fact)
and then matching
pmatch(spec.groups[1],spec.fact)
to get out the indexes of all the columns that match the second unique
value, i.e what are the column number for all the abco columns. Then I
could make a temporary data.frame of just the abco columns. I could loop
through the unique vector spec.groups to do this for each group and
perform the operations I need to on each individual mini-dataframe.
Unfortunately the matching doesn't work. Any suggestions?
Ken
Kenneth B. Pierce Jr.
Research Ecologist
Landscape Ecology, Modeling, Mapping and Analysis Team
PNW Research Station - USDA-FS
3200 SW Jefferson Way, Corvallis, OR 97331
[EMAIL PROTECTED]
541 750-7393
http://www.fsl.orst.edu/lemma/gnnfire
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