fenics team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, Jun 28, 2010 at 03:05:18PM +0200, Lorenzo Isella wrote:
> Hi Johannes,
> I had missed that.
> Just for the record, the snippet at the end of the email now works as it
> is supposed to.
> Last question about the example script: did anyone find a more
> up-to-date version of the tutorial you can download at
>
> http://www.fenics.org/pub/documents/fenics/tutorial/fenics-tutorial.pdf  ?

I don't think there's an updated tutorial but it will be available in
the "near" future, both as part of the FEniCS book and online in HTML
format.

--
Anders


> Cheers
>
> Lorenzo
>
>
>
> ##########################################################
>
> from dolfin import *
> # Create mesh and define function space
> mesh = UnitSquare(6, 4)
> V = FunctionSpace(mesh, "CG", 1)
> # Define boundary conditions
> u0 = Expression("1 + x[0]*x[0] + 2*x[1]*x[1]")
>
> class Boundary(SubDomain): # define the Dirichlet boundary
>     def inside(self, x, on_boundary):
>         return on_boundary
>
> u0_boundary = Boundary()
> bc = DirichletBC(V, u0, u0_boundary)
> # Define variational problem
> v = TestFunction(V)
> u = TrialFunction(V)
> f = Constant( -6.0)
> a = dot(grad(u), grad(v))*dx
> L = f*v*dx
> # Compute solution
> problem = VariationalProblem(a, L, bc)
> u = problem.solve()
> # Plot solution and mesh
> plot(u)
> plot(mesh)
> # Dump solution to file in VTK format
> file = File("poisson.pvd")
> file << u
> # Hold plot
> interactive()
>
>
> On Mon, 2010-06-28 at 13:21 +0200, Johannes Ring wrote:
> > Hi Lorenzo,
> >
> > On Mon, Jun 28, 2010 at 12:39 PM, Lorenzo Isella
> > <lorenzo.isella@xxxxxxxxx> wrote:
> > > Apologies for the tremendous delay but I have been unwell.
> > > After a fresh installation of ubuntu 10.04 and fenics, I still have
> > > troubles in running the script.
> > > Any suggestions?
> >
> > Did you try what Johan was suggesting? You will also need to remove
> > the "mesh" argument from the call to Constant in line 15.
> >
> > Johannes
>
>
>
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