ufl team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Nov 09, 2009 at 02:05:29PM +0100, Anders Logg wrote:
> On Mon, Nov 09, 2009 at 12:58:32PM +0000, Garth N. Wells wrote:
> >
> >
> > Marie Rognes wrote:
> > > Kristian Oelgaard wrote:
> > >> Quoting Anders Logg <logg@xxxxxxxxx>:
> > >>
> > >>
> > >>> This is something we've discussed before, but I want to discuss it
> > >>> again.
> > >>>
> > >>> Could we change the definition of the gradient of a vector to be the
> > >>> "normal" definition:
> > >>>
> > >>>   grad(u) = du_i / dx_j
> > >>>
> > >>> ?
> > >>>
> > >> I think this sounds like an excellent idea.
> > >>
> > >>
> > >
> > > Me too.
> > >
> >
> > Cowards!  ;)  You wait for Martin the leave and then jump on the bandwagon.
> >
> > I suggested this March/April, and Martin's argument against was for
> > consistency with other operations. I think that it's fine to change so
> > long that other operations do not break or lead to
> > unexpected/inconsistent results.
>
> :-)
>
> I've had this discussion with Martin at least twice and both times he
> managed to convince me of his definition. But I keep forgetting the
> arguments in favor of the current definition (and more so when it
> gets me into trouble).

I've created a blueprint:

https://blueprints.launchpad.net/ufl/+spec/redine-grad

Add your comments there. (Harish, add comments on div.)

We can let this sink in for a while and give Martin time to comment.

--
Anders

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