2011/4/6 Gong Ding <gdiso at ustc.edu> > Ok, I will investigate matrix null space problem. > The matrix comes from nonlinear problem, I wonder if I need to calculate > the eigenvector each time. >
Possibly, but it is more likely that the null space is something simple like a constant. > > Several months ago, some one committed DGMRES implementation, which also > dropped smallest eigen value. > It it possible to use (slightly modified) DGMRES as flexable tool for > sigular problem? > I'm not familiar with DGMRES. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110406/b752348a/attachment.htm>
