On Wed, 16 Aug 2006 08:08:16 -0700 "David Grant" <[EMAIL PROTECTED]> wrote: > On 8/16/06, Nils Wagner <[EMAIL PROTECTED]> >wrote: >> >> Keith Goodman wrote: >> > On 8/15/06, David Grant <[EMAIL PROTECTED]> wrote: >> > >> > >> >> My idea is (if I have time) to write an eigs-like >>function in python >> >> that will only perform a subset of what Matlab's eigs >>does for. It >> >> will, for example, compute a certain number of >>eigenvalues and >> >> eigenvectors for a real, sparse, symmetric matrix >>(the case I'm >> >> interested in) >> >> >> > >> > >> AFAIK, pysparse (in the sandbox) includes a module that >>implements a >> Jacobi-Davidson >> eigenvalue solver for the symmetric, generalised matrix >>eigenvalue >> problem (JDSYM). >> Did someone test pysparse ? >> >> I did try pysparse a few years ago (I think right before >>sparse stuff came > into scipy). I think there is probably an old post >asking the list about > sparse stuff and I think Travis had just written it and >told me about it... > can't remember. Can JDSYM just return the k lowest >eigenvalues/eigenvectors? > > -- > David Grant > http://www.davidgrant.ca
Yes. See http://people.web.psi.ch/geus/pyfemax/pysparse_examples.html for details. Nils ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
