On Tue, May 22, 2012 at 6:10 AM, Klaij, Christiaan <C.Klaij at marin.nl> wrote:
> In src/ksp/ksp/examples/tutorials/ex42.c.html the Stokes system > is solved and KSPBuildResidual is used to compute the residuals > for the velocity components and pressure individually. Are these > the preconditioned residuals or the true residuals? The true residual. > And how to > get both? > Precondition it. Note that if you only want norms, GMRES will compute one (preconditioned by default). -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20120522/d639206b/attachment.html>
