For some preconditioners it is simply not easily possible to apply the transpose of the preconditioner. Even multigrid requires some work to do this.
Barry On Thu, 11 Oct 2007, Keita Teranishi wrote: > Hi, > > > > I'd like to make sure preconditioners supported for bicg. I found bicg only > accepts preconditioners that is interfaced through PCApplyTranspose. > > For this reason, I see several preconditioners fails with bicg. > > > > Thanks, > > ================================ > Keita Teranishi > Math Software Group > Cray Inc. > keita at cray.com > ================================ > > > >
