I: [R] results from sammon()

From: Domenico Cozzetto <domenico.cozzetto_at_uniroma1.it>
Date: Wed 20 Apr 2005 - 20:15:10 EST


Thanks for the attention paid to my rpoblem. Please find enclosed the matrix with my dissimilarities. This is the only case in which sammon(), from the MASS package, gives me this kind of problems. Domenico

>
> > -----Messaggio originale-----
> > Da: Jari Oksanen [mailto:jarioksa@sun3.oulu.fi]
> > Inviato: mercoledý 20 aprile 2005 11.53
> > A: Domenico Cozzetto
> > Cc: R-News
> > Oggetto: Re: [R] results from sammon()
> >
> >
> > 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 <jarioksa@sun3.oulu.fi>
> >



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Received on Wed Apr 20 21:04:50 2005

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