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[Johan Hake <question153689@xxxxxxxxxxxxxxxxxxxxx>]

Question #153689 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/153689

    Status: Open => Answered

Johan Hake proposed the following answer:
This looks like a bug in Viper for plotting of 1D functions. If you switch 
your mesh to a square it works.

Consider filing a bug (in dolfin) for this and attach the script.

Johan


On Thursday April 21 2011 01:16:44 Bento wrote:
> New question #153689 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/153689
> 
> Hi,
> 
> I try to solve a time-dependent problem, however the plotting does not show
> the change of the function over time. The plot window always shows the
> function in that timestep in which the plot command was first called. What
> am I doing wrong? The time-dependent example look similar, but they work.
> Here is the simplest example that goes wrong:
> 
> from dolfin import *
> 
> T_initial = Constant(293.0)
> 
> dt = 1.0
> t = dt
> 
> mesh = Interval(200, 0, 20.0)
> 
> V = FunctionSpace(mesh, "CG", 1)
> 
> T = TrialFunction(V)
> v = TestFunction(V)
> 
> def inflow(x, on_boundary):
>     return on_boundary and x[0] < 1.0
> 
> BC = DirichletBC(V, 800.0, inflow)
> T_prev = interpolate(T_initial, V)
> 
> a = (T*v + dt*T.dx(0)*v.dx(0))*dx
> L = T_prev*v*dx
> 
> f = Function(V)
> 
> 
> while t < 1000:
>     A = assemble(a)
>     l = assemble(L)
>     BC.apply(A,l)
>     solve(A,f.vector(), l)
>     plot(f)
>     T_prev.assign(f)
>     t += dt

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