R help - Jan 2004 - cca in vegan

Hello all,

I'm hoping this is a simple problem.

I'm trying to do cca of my data.  I have my plant data and environmental
data as 2 separate files.  I have 3 years of data, stacked vertically, within
these files.  I want to conduct the cca for each year and am trying to create
separate year files using the following:

cnts94 <- cnts[1:27,]
env94 <- env[1:27,]

when I run

cca(cnts94, env94)

I get the following error message:

Error in cca.default(cnts94, env94): All row and column sums must be >0 in
the community matrix

There are no missing data points in the data set.

If I run the whole data set:

cca(cnts, env)

it works, and I can plot and do all the associated stuff.

Why not work if I specify a smaller data set?  Am I specifying it wrong?

Thanks,
Suzanne

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Curious.
> I get the following error message:
> 
> Error in cca.default(cnts94, env94): All row and column sums 
> must be >0 in the community matrix
Check the row and column sums if you haven't:
colSums(cnts94)
rowSums(cnts94)

There is probably a veg plot (row) that has all zeros in it.

Just a thought.
-Andy