  Compressed manifold modes are locally supported analogues of eigenfunctions
of the Laplace-Beltrami operator of a manifold. In this paper we describe an
algorithm for the calculation of modes for discrete manifolds that, in
experiments, requires on average 47% fewer iterations and 44% less time than
the previous algorithm. We show how to naturally order the modes in an
analogous way to eigenfunctions, that is we define a compressed eigenvalue.
Furthermore, in contrast to the previous algorithm we permit unlumped mass
matrices for the operator and we show, unlike the case of eigenfunctions, that
modes can, in general, be oriented.
