dolfin team mailing list archive

[Johan Jansson <jjan@xxxxxxxxxxx>]

On Tue, Sep 19, 2006 at 07:35:28PM +0200, Anders Logg wrote:

...

> ok. I guess there are cases when you need to operate on the vector
> (like computing 1/u or |u| or things FFC can't do) but otherwise,
> you should never need to look at the vector.
> 
> /Anders

In this case it's that we have components of a function which do not
need space discretization, such as the wave equation:

dot(u_1) = u_2
(dot(u_2) * v) * dx = -(grad(u_1) * grad(v)) * dx

I don't know if FFC should be involved with the first equation at all
since it's not a form. Or what do you think?

  Johan