ANOSIM in Vegan is not working

问题:

I am trying to perform an anosim analysis in Vegan, but it doesn't seem to work... It doesn't give an error after the anosim function, but when I try to see the summary it says:

Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) :
'x' must be atomic

My data looks like a simple community matrix with sites and species (identical to the Dune data set).

I've tried this:

dist.com <- vegdist(data, method = "bray")
an = anosim(dist.com, env)
summary(an)

The class of data is a data.frame , the class of env is factor and the class of dist.com is dist.

It is identical to the example in help...

How can I fix this problem?

回答1:

There is nothing reproducible here, but I can generate this error message if the factor has only one level:

summary(anosim(vegdist(dune), rep("a", nrow(dune))))