Re: [R] results from sammon()

From: Jari Oksanen <>
Date: Wed 20 Apr 2005 - 19:52:48 EST

On Wed, 2005-04-20 at 10:35 +0200, Domenico Cozzetto wrote:
> Dear all,
> I'm trying to get a two dimensional embedding of some data using different
> meythods, among which princomp(), cmds(), sammon() and isoMDS(). I have a
> problem with sammon() because the coordinates I get are all equal to NA.
> What does it mean? Why the method fails in finding the coordinates? Can I do
> anything to get some meaningful results?

I'm sorry, but I can't reproduce your problem. I have tried hard with different tricks, but sammon() always gives good numeric results, or reports on the problems with the input and refuses to continue. For a starter: which sammon did you use. I think there may be three or four implementations in R with that name alone (and some variants may be names differently). I used sammon() in MASS (Venables & Ripley), and could not get NA. You need to give more details if you want to get help.

cheers, jari oksanen

Jari Oksanen <>

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Received on Wed Apr 20 20:14:44 2005

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