We should write a FAQ question that addresses all theses issues. I admit I
don't really want to add these scalings to PETSc it makes the code more
complicated, unless we really need it.
Barry
On Apr 5, 2011, at 1:24 AM, Jed Brown wrote:
> On Tue, Apr 5, 2011 at 06:10, Barry Smith <bsmith at mcs.anl.gov> wrote:
> They are done to change the relative importance of different entries in the
> vector to determine stopping conditions and search directions in Newton's
> method.
>
> Note that weighting fields differently is equivalent to choosing units for
> the different fields. I think it is generally a good idea to make the units a
> runtime option anyway since it lets you check that the code is dimensionally
> correct.
