That is what is am doing and it still complains about Mismatching Function Spaces.. So what I have now is, let's say u1_ = Function(V) u2_ = Function(V) w = Function(W), where W = V*V v = TestFunction(W) u1, u2 = split(w) v1, v2 = split(v) *Here I also tried defining instead v1, v2 = TestFunctions(W).* F = fn(u1, u2, u1_, u2_; v1) G = fn(u1, u2, u1_, u2_; v2) u1, u2 = w.split() *OR does this need to be after the variational problem is solved?* *I tried both with the same outcome.* solve(F == 0, w) u1_.assign(u1) u2_.assign(u2). On 26/11/14 12:45, Lawrence Mitchell wrote:
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On 26/11/14 12:24, Anna Kalogirou wrote:
Do I still need to define u1, u2, u3 = Functions(V), where V is in original space? After the variational problem is solved I split w as
u1, u2, u3 = split(w)
and try to print u1, u2, u3 in files, but I get
AttributeError: 'Indexed' object has no attribute 'function_space'. Aha, you run into the split(w) vs. w.split() problem.
When you're defining your variational form, you need to use the former. For output purposes (and assignment in a timestepping loop) you need to use the latter.
e.g.
u1, u2 = split(w)
F = fn(u1, u2; v)
u1, u2 = w.split()
solve(F == 0, w)
u1_.assign(u1) u2_.assign(u2)
etc...
Also, I can't interpolate or assign. In the end, I want to pass u1, u2, u3 to some other functions u1_, u2_, u3_, which also appear in the residual expressions. But this produces a 'Mismatching function spaces' error. I hope the above should also clear up this problem.
Cheers,
Lawrence -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/
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-- Dr Anna Kalogirou Research Fellow School of Mathematics University of Leeds