graph eigenspaces (with default settings, maybe they can be tweaked?) are quite adequate for up to 25-30 vertices, then it get very slow, indeed...
For the kind of computations you have in mind, I prefer using cvxopt (a Sage package); although it's primarily for optimization, it has a nice sparse matrices support, and nice LAPACK interface: http://abel.ee.ucla.edu/cvxopt/userguide/index.html its interface to Sage is quite rudimentary, but still... Dima -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
