Anders Logg wrote:
> FFC is now fully functional w.r.t. compilation of UFL forms, at least
> judging by the demos in FFC which now all produce correct results.
>
> The Poisson demo in DOLFIN has also been moved to UFL.
>
> I therefore suggest we make new releases of FFC, UFL and DOLFIN:
>
> DOLFIN 0.9.2
> FFC 0.6.2
> UFL 0.1.0 ?
> SyFi/SFC?
>
> This batch of releases will support both the old .form format and the
> new .ufl format. After the release, we can get started on cleaning up
> and removing the .form format.
>
> In it's simplest form, the UFL form language looks very much like the
> FFC form language. Here's a comparison for the Poisson demo:
>
> FFC
> ---
>
> element = FiniteElement("Lagrange", "triangle", 1)
>
> v = TestFunction(element)
> u = TrialFunction(element)
> f = Function(element)
>
> a = dot(grad(v), grad(u))*dx
> L = v*f*dx
>
> UFL
> ---
>
> element = FiniteElement("Lagrange", triangle, 1)
>
> v = TestFunction(element)
> u = TrialFunction(element)
> f = Function(element)
>
> a = inner(grad(v), grad(u))*dx # dot also works
> L = v*f*dx
>
> However, UFL does much more, like treatment of tensor expressions,
> nonlinear operators like sin, cos, exp, sqrt, differentiation of forms
> w.r.t. variables etc. For more information, look at Martin's summary:
>
> http://www.fenics.org/wiki/UFL
>
> UFL includes a script form2ufl that can be used to convert from the
> old FFC form language to the new UFL form language. The script is not
> foolproof but it may help in converting to the new format.
>
> So, let's make a new release now (after getting the buildbot green
> again for DOLFIN) and then make the full transition after the release.
>
> It's also time to promote UFL from a development project (/dev) to a
> proper project (/hg) since now FFC, SFC and DOLFIN will depend on it.
> Any objections?
>
It would be worth checking with Kristian how far away the quadrature
optimisations are for FFC + UFL. If it's only a few days, it would be
good to wait on the FFC release since the new quadrature code is quite a
bit slower than the old code (around a factor of 5 in some of my tests).
Garth
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> UFL-dev mailing list
> [email protected]
> http://fenics.org/mailman/listinfo/ufl-dev
_______________________________________________
DOLFIN-dev mailing list
[email protected]
http://www.fenics.org/mailman/listinfo/dolfin-dev
