Something is wrong with sub-functions in Python. For the mixed-poisson
demo, doing
(sigma, u) = problem.solve().split()
plot(u)
the plot looks as expected. Doing
U = problem.solve()
plot(U[1])
the plot is wrong. Also, it's not possible to do
f = File("u.pvd")
f << U[1]
I get the message
TypeError: in method 'File___lshift__', argument 2 of type
'dolfin::FunctionPlotData const &'
Garth
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