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psm1
2006 Sep 20
1
problem coercing truncated character vector to levels
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 the...