[R] about isoMDS method

[stephen sefick]

Are you using euclidean distances?

On Sun, Aug 30, 2009 at 7:33 AM, Grzes<gregorio99 at gmail.com> wrote:
>
> Hi,
> For example:
> I built a half matrix "w" using a daisy(x, metric = c("euclidean"))
>
> http://www.nabble.com/file/p25211016/1.jpg
>
> And next I transformed this matrix "w" using isoMDS function, for example
> isoMDS(w, k=2) and as result I got:
> http://www.nabble.com/file/p25211016/2.jpg
> And now I have two questions:
>
> 1. If number in matrix  w[2, 1]  (= 0.41538462) match  two points (below) in
> matrix created by isoMDS [1,1:2] and [2,1:2] ?
> http://www.nabble.com/file/p25211016/3.jpg
>
> Is this the same point?
>
> 2. If it's true why I can't check my euclidean distance by using this
> equation:
> d<-
> ((0.511396296-(-0.129372871))^2+((-0.0171714934)-(-0.2759703494))^2)^(1/2)
>
> I thought that "d" should be 0.41538462 but unfortunately I get d=0.6910586.
> Why?
> --
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>
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-- 
Stephen Sefick

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods.  We are mammals, and have not exhausted the
annoying little problems of being mammals.

								-K. Mullis