search for: isomap

Hello I will be applying MDS (actually Isomap) to make a psychological "concept map" of the similarities between N concepts. I would like to scale to a large number of concepts, however, the resulting N*(N-1) pairwise similarities is prohibitive for a user survey. I'm thinking of giving people random subsets of the pairwise simi...

Is there any R package which implements non-linear dimensionality reduction (LLE, ISOMAP, GTM, and so on) and/or intrinsic dimensionality estimation ? Thank you, Maura tutti i telefonini TIM! [[alternative HTML version deleted]]

Hi, there: I am wondering if anyone here can provide an example using pca doing dimension reduction for a dataset. The dataset can be n*q (n>=q or n<=q). As to dimension reduction, are there other implementations for like ICA, Isomap, Locally Linear Embedding... Thanks, weiwei -- Weiwei Shi, Ph.D "Did you always know?" "No, I did not. But I believed..." ---Matrix III [[alternative HTML version deleted]]

...son was that rgl can cause problems in several platforms and even prevent installing vegan. Indeed, when I tested these functions, they crashed in this Mac laptop. We have now a separate vegan3d package for these functions https://github.com/vegandevs/vegan3d . In addition to ordirgl + friends, rgl.isomap and rgl.renyiaccum it also has oriplot3d package. This package has now the same functionality as these functions had in vegan, and our purpose is to release that concurrently with vegan 2.2-0. I recently suggested to remove these functions from vegan, but we haven't made that change yet so that...