[R-sig-eco] vegdist producing empty result object

[Peter Solymos]

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
>
>
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