[R] Write lower half of distance matrix only

jim holtman jholtman at gmail.com
Fri Jul 25 14:09:27 CEST 2008

How do you want the lower half written out?  can you give us an
example of the input matrix and then what you would expect to see on
the output.  Is it still a matrix with the upper half set to zero/NA?
Do you want it as a vector?  What is the other program expecting as

You need to provide more information so that we can provide suggestions.

On Fri, Jul 25, 2008 at 7:03 AM, pgseye <prseye at gmail.com> wrote:
> 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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Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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