ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

Good suggestion, I'll add cross(), trace() and probably mult()
so you can multiply with permutation matrices/tensors.

/Anders

On Fri, Sep 09, 2005 at 08:10:35AM +0200, Garth N. Wells wrote:
> Hi Anders,
> 
> Looks great. I'll try it out and let you know. One useful non-differential
> operator (for me at least) would the cross product. Perhaps the most generic way
> to allow for it would be to add the permutation tensor when you're ready for
> higher-order tensors.
> 
> Garth
> 
> 
> 
> Quoting Anders Logg <logg@xxxxxxxxx>:
> 
> > The new operators are now in place:
> > 
> >     dot  - scalar product
> >     grad - gradient
> >     div  - divergence
> >     rot  - rotation (curl works also)
> > 
> > One can now write things like
> > 
> >     a = div(grad(dot(rot(v), u)))*dx
> > 
> > Please try them out and tell me if they work. Suggestions for
> > modifications of the behavior of these operators as well as
> > suggestions for new (standard) operators that might make life easier
> > for you are also welcome. Remember, these operators are defined
> > independently from and on top of the form algebra so adding a new
> > operator does not add to the complexity of the form language (this
> > comment is for you Rob ;-).
> > 
> > /Anders
> > 
> > _______________________________________________
> > FFC-dev mailing list
> > FFC-dev@xxxxxxxxxx
> > http://www.fenics.org/cgi-bin/mailman/listinfo/ffc-dev
> > 
> 

-- 
Anders Logg
Research Assistant Professor
Toyota Technological Institute at Chicago
http://www.tti-c.org/logg/