vegdist producing empty result object
Dave, The vegdist function of the vegan package produces an object of class "dist" similarly to the dist function in stats. It can be converted into a symmetric matrix by as.matrix(x). The help page of dist will give you details about the structure of "dist" objects. Cheers, Peter
On Wed, Apr 7, 2010 at 12:02 PM, Chagaris, Dave <Dave.Chagaris at myfwc.com> wrote:
I have a dataframe of abundances with 385 rows (samples) and 82 columns (species). ?I am trying to compute the Bray-Curtis dissimilarity between samples. ?For some reason, the resulting distance object output by vegdist is empty and when I dim the object the result is NULL. ?I don't get any error messages. ?The same dataset works in matlab and ?Primer. Does anybody know what might be causing this? ?The output is below. ?Thanks.
? dim(guts)
[1] 385 ?82
? disBray <- vegdist(guts, method="bray")
? dim(disBray)
NULL
? is.matrix(disBray)
[1] FALSE Dave David Chagaris Associate Research Scientist Florida Fish and Wildlife Conservation Commission Florida Fish and Wildlife Research Institute 100 8th Ave SE St. Petersburg, FL ?33701 (727) 896-8626 ext. 4305 (727) 893-1374 fax ? ? ? ?[[alternative HTML version deleted]]
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