Hello,
I am attempting to use nonmetric dimensional scaling (metaMDS) in vegan
(1.17.2).
My data are 105 samples in rows and 1271 variables (peak positions for
community fingerprinting) in columns.
When starting metaMDS in the default settings, the analysis goes past
Run 0 but after Run 1, I get the error message:
Error in class(S) <- "scores" : attempt to set an attribute on NULL
I tried several other dissimilarity indices (e.g. euclidean) and the
analysis goes through various runs but eventually always crashes with
the same error message.
I have also tried the example from ?metaMDS which also failed. This made
me think that there may be some kind of conflict between packages. And
voilà, after closing and restarting R, just using vegan and MASS, the
example worked fine.
For aligning the community fingerprints, I use StatFingerprints which
depends on a ton of other packages.
Does anybody know how to read the error message? What is it pointing at
and how could I find out which package is causing me trouble?
Thanks a lot in advance for any help,
Kim
Package: vegan
Title: Community Ecology Package
Version: 1.17-2
R version 2.10.0 (2009-10-26)
--
________________________________________________
Kim Milferstedt, PhD
Postdoctoral Researcher
INRA
Laboratoire de Biotechnologie de l'Environnement
Avenue des Etangs
F-11100 Narbonne
France
phone: (+33) 04 68 42 51 87
fax: (+33) 04 68 42 51 60
email: [email protected]
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