We currently have no way to compute svd of sparse matrices. Scipy has an experimental wrapper of arpack
http://www.caam.rice.edu/software/ARPACK/ which can computes eigenvalues of sparse matrices and svd which is now built with sage, however, only the eigenvalue functionality is wrapped. Sparse svd would be great. If we use swig we would need to either include swig with sage or pregenerate the swig wrappers and just include that. Josh On Dec 14, 10:35 pm, "David Roe" <[EMAIL PROTECTED]> wrote: > My housemates have been writing a Python wrapper for SVDLIBC (a C library > that does SVDs for sparse and dense matrices over the reals) using Swig. I > suggested that they use Cython instead and thought that this might make a > good spkg. I've asked a few people about sparse SVDs, and I think Sage > currently has no mechanism to do this. Thoughts? At some point I'll > probably ask for help on IRC in making an spkg since I've only been involved > in writing library code and not at all on the spkg side of things. > > The website for SVDLIBC:http://tedlab.mit.edu/~dr/SVDLIBC/ > > David --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
