Hi Maura,
> Is there any R package which implements non-linear dimensionality reduction
(LLE, ISOMAP, GTM, and so on) ?and/or intrinsic dimensionality estimation ?
I am not exactly sure what is meant by non-linear dimensionality
reduction but there is an isomap function in vegan. This is the isomap
of Tenenbaum et al. 2000 and De'ath 1999.
library(vegan)
?isomap
De'ath, G. (1999) Extended dissimilarity: a method of robust
estimation of ecological distances from high beta diversity data.
Plant Ecology 144, 191?199
Tenenbaum, J.B., de Silva, V. & Langford, J.C. (2000) A global network
framework for nonlinear dimensionality reduction. Science 290,
2319?2323.
Hope this helps,
Michael
> Thank you,
> Maura
>
>
> tutti i telefonini TIM!
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Michael Denslow
I.W. Carpenter Jr. Herbarium [BOON]
Department of Biology
Appalachian State University
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