On Thu, Nov 4, 2010 at 10:18, Benjamin Sanderse <B.Sanderse at cwi.nl> wrote:
> I am not sure if I understand you correctly. During initialization, several > matrices are formed by kronecker products, and the resulting matrices have > the size of the number of unknowns; i.e. if n is the number of unknowns then > the matrices are n x n, although they typically have only a*n nonzero > elements, with a around 10-20. > I'm curious about the structure of these kronecker products. For example, you may have K = A \otimes B Is either one of A or B dense? Are they both large and distributed, or is one much smaller than the other? If they are both distributed, what distribution do you want the vector to have? A different question is, what problem are you solving? E.g. if this is a Galerkin method for stochastic PDE, it gives us some idea about the structure, and the natural follow-up question is what is the size of the (reduced how?) stochastic space, and do the stochastic basis functions have local or global support. Jed -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20101104/99a83c02/attachment.htm>
