On Thu, Feb 9, 2012 at 8:09 AM, Hui Zhang <buyong.huier at gmail.com> wrote:
> Hi, > > Is sparsity of Vec exploited in MatMult? I'm implementing some domain > decomposition > methods. The residual is non-zero or significant only at very few nodes. > Does > MatMult knows that most entries of the Vec are zeros? Is there a threshold > to > regard an value as zero? > No. Matt > Thanks, > Hui -- 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/20120209/486b5c06/attachment.htm>
