> Is the actual ‘intrinsic’ vector space uncomputable? Too slow to find? OMG yes. It's also an unsolved problem, once can approximate it. I've written sever

> Is the actual ‘intrinsic’ vector space uncomputable? Too slow to find? OMG yes. It's also an unsolved problem, once can approximate it. I've written several non-parametric blind arbitrary dimension DR algorithms and been obsessed with the space most of my life. If you think O(n^2) feels slow, try O(n^3)...:) For more, read about mean shift clustering, or the new hot stuff: topological data analysis/bar codes/mapper algorithm.