I stumbled across this today: https://github.com/leopd/geometric-intuition accompanied by an assertion that you can find the eigenvectors for a hermitian matrix from its eigenvalues and the eigenvalues of its submatrices. I have not yet worked through the details of that, but it sounds plausible and might be of interest to some of you, here.
But the repository itself covers a lot more ground than that. Anyways, the code is python, but a lot of it is fairly straightforward to re-implement, and there's good english descriptions and illustrations, also. So this looks like fun. FYI, -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
