On Wed, Dec 14, 2011 at 13:50, Mark F. Adams <mark.adams at columbia.edu>wrote:
> What I am doing is classic inexact Newton (or it looks like these folks > are doing Picard). It appears that they are doing Picard in one-shot mode instead of in defect correction mode. If you write it as a defect correction, then the initial guess will be zero and the standard tolerance is the correct one. I maintain that defect correction is better in every way for solvers, and it naturally gives you a nonlinear residual so that you can use a reliable nonlinear solver tolerance. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20111214/4cef83c9/attachment.html>
