[R] Write lower half of distance matrix only

[pgseye]

Hi,

I'm very new to R. I want to know if there is any way to write only the
lower half of a distance matrix created in R to a csv file for example.  I
get the 'cannot coerce class "dist" into a data.frame' message when I try. 
I have used as.matrix and can write to a file this way, but as a full
matrix. 

The reason I only want the lower half is that I've been doing some Mantel
correlations with distance matrices (of Procrustes distances) generated by
other (geometric morphometric) software that are in this format. However,
I'm needing to use an alternative such as R to calculate distance matrices
of Fourier coefficients which the other software can't do.  So far, the
Mantel correlations calculated from these two matrices (with R and also
another software (Mantel for Windows)) are slightly different (when they
should be exactly the same) and I'm wondering whether it's because the input
format is different (ie one full, one half).

Thanks,

Paul


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