[Scott]: As an aside, do you know of good sparse matrix implementions and/or one that used prefix matching techniques? Never used it myself, but I heard good things about
Colt back when it came out, years ago. (Not about sparse matrices in particular, but the library in general.) Haven't heard much since - I haven't done much resembling real math in some time. No idea about prefix matching techniques in matrices, sorry. Though it sounds like you're in good shape now anyway...