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swissroll(N=1000)
Balasubramanian M, Schwartz EL. The isomap algorithm and topological stability. Science 2002;295(5552):7.
Roweis ST, Saul LK. Nonlinear dimensionality reduction by locally linear embedding. Science 2000;290(5500):2323-6.
helicoid
dinisurface
spirals
require("rgl") x=swissroll() open3d() plot3d(x, col=rainbow(1050)[-c(1:50)],box=FALSE,type="s",size=1)
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