[R] isoMDS and dist

[Prof Brian Ripley]

On Thu, 4 Sep 2008, Carolyn A. Pucko wrote:

>
> I am starting with a matrix in which rows are vegetation plots and columns 
> are various characteristics including ID# and elevation. I removed elevation 
> and ID columns to avoid having those characteristics influence the distances 
> between points which I calculated using the "dist" command. The resulting 
> distance file was then used in isoMDS.
>
> What I want to know is whether I can reattach the ID and elevation onto the 
> point location information given from isoMDS? or is it possible that the 
> order given in the isoMDS output is not the same as the order of the original 
> data used to calculate distances?

The order is the same.  From the help page

Value:

      Two components:

   points: A k-column vector of the fitted configuration.
...

and see how it describes 'the fitted configuration'.

BTW, it is regarded as basic courtesy to credit the work of others: isoMDS 
is from package MASS.



>
> Thanks,
> Carrie Pucko
> University of Vermont
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595