On Thu, Aug 9, 2012 at 10:59 PM, Matthew Knepley <knepley at gmail.com> wrote:
> On Thu, Aug 9, 2012 at 9:56 PM, Yifei Li <yifli82 at gmail.com> wrote: > >> Matt, >> >> I'm new to PETSC, can you pls explain what you mean by 'keep it in >> unassembled form'? >> > > Just keep two vectors, u^T v, instead of the dense matrix. > > But I need the result of the outer product (e.g, A) for further calculation (e.g., A*W). > > > Matt > > >> A small example would be nice too. Thanks >> >> Yifei >> >> On Thu, Aug 9, 2012 at 9:15 PM, Matthew Knepley <knepley at gmail.com>wrote: >> >>> On Thu, Aug 9, 2012 at 5:39 PM, Yifei Li <yifli82 at gmail.com> wrote: >>> >>>> Hi, >>>> >>>> I did not find any function doing this in the manual. Could someone >>>> suggest a good way to do this? >>>> >>> >>> That gives a dense matrix. You would never want to do this. You would >>> keep it in unassembled form. >>> >>> Matt >>> >>> >>>> >>>> Thanks >>>> >>>> Yifei >>>> >>> >>> >>> >>> -- >>> What most experimenters take for granted before they begin their >>> experiments is infinitely more interesting than any results to which their >>> experiments lead. >>> -- Norbert Wiener >>> >> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120809/b5d848e4/attachment.html>
