On Mon, Feb 7, 2011 at 22:19, Barry Smith <bsmith at mcs.anl.gov> wrote:
> It uses U0 but never explains what it is. It also calls a the "shift" but > never explains what it is. Perhaps some notes explaining this stuff would > make the solver more transparent. And a reference to further material that > uses this approach would be great if it exists. Suppose we have f(x,y). There are two ways to express the derivative we need 1. f_x(x,y) + a*f_y(x,y) 2. g_x where g(x) = f(x,z+a*x) I used version 2 in the man page because I think 1 looks arbitrary and is less obvious how it arises from a time integrator. There is a note later in the page about the equivalence. I suppose the name "shift" is more natural for version 1. Do you think I should make version 1 primary (or remove any mention of 2)? Do you have a better name for "shift", or just want more text (I felt like elaborating would be describing a simple equation in words)? -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20110207/40dce995/attachment.html>
