R help - Jun 2013 - X-axis in meandist {vegan}

I am using vegan package for estimating dissimilarity within and between
clusters, and plotting them. The following code gives me a dendrogram
without X-axis. How would I add X axis to the plot? Below "dataEnv" is
a
matrix of my environmental variables. dataFact$Source_by_Type has the
levels that delineate clusters.

dataEnvDist <- vegdist(dataEnv, method="bray") ## bray curtis
dissimilarity
meanDist <- meandist(dataEnvDist, dataFact$Source_by_Type)
plot(meanDist, ylab="Mean dissimilarity")

Thanks in advance.

Kumar Mainali

-- 
Section of Integrative Biology
University of Texas at Austin
Austin, Texas 78712, USA

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Dear Kumar Mainali, 

On 03/06/2013, at 00:01 AM, Kumar Mainali wrote:
> I am using vegan package for estimating dissimilarity within and between
clusters, and plotting them. The following code gives me a dendrogram without
X-axis. How would I add X axis to the plot? Below "dataEnv" is a
matrix of my environmental variables. dataFact$Source_by_Type has the levels
that delineate clusters.
> 
> dataEnvDist <- vegdist(dataEnv, method="bray") ## bray curtis
dissimilarity
> meanDist <- meandist(dataEnvDist, dataFact$Source_by_Type)
> plot(meanDist, ylab="Mean dissimilarity")
> 
What should the X-axis show? 

You can add X-axis with command axis(1), but it hardly shows anything useful.

Cheers, Jari Oksanen

--
Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland