Kendra,
Are you sure that it was a factor? I am unable to trigger an error with a
one-level factor in vegan 2.0-9. Moreover, the error message you sent was from
vectorfit and factors (also one-level factors) are not handled in that function
but they go to factorfit, and error should come from f
My offending variable was correctly imported as a factor, but since I was
subsetting the data to look only at one zone at a time it was a factor with
only one level
--
Kendra Maas Mitchell, Ph.D.
Post Doctoral Research Fellow
University of British Columbia
604-822-5646
Phillip,
You approach to using factors misses an important consideration; the
class that was observed in the full dataset should not disappear just
because you subsetted the data in some manner. Also, `droplevels()` is
a useful function to call on a factor or data frame if subsetting
produces leve
On 05/12/2013, at 18:42 PM, Dixon, Philip M [STAT] wrote:
>
> I wonder if the problem is a factor level with no observations. One of the
> frustrating things about factors (class variables) in R is that the list of
> levels is stored separately from the data. This can cause all sorts of
> pr
