[Numpy-discussion] sort bug

Matthieu Brucher matthieu.brucher@gmail....
Sun Apr 29 16:04:12 CDT 2007


2007/4/29, Anton Sherwood <anton.sherwood@gmail.com>:
>
> > Anton Sherwood wrote:
> > > I'm using eigenvectors of a graph's adjacency matrix as "topological"
> > > coordinates of the graph's vertices as embedded in 3space (something I
> > > learned about just recently).  Whenever I've done this with a graph
> that
> > > *does* have a good 3d embedding, using the first eigenvector results
> in
> > > a flat model: apparently the first is not independent, at least in
> such
> > > cases.  . . .
>
> Charles R Harris wrote:
> > . . . the embedding part sounds interesting,
> > I'll have to think about why that works.
>
> It's a mystery to me: I never did study enough matrix algebra to get a
> feel for eigenvectors (indeed this is the first time I've had anything
> to do with them).
>
> I'll happily share my code with anyone who wants to experiment with it.
>

Seems to me that this is much like Isomap and class multidimensional
scaling, no ?

Matthieu
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