Hi Lawrence, yes, I use the mixed function spaces only in the preconditioner, so I went for your alternative solution. However, now I get: L = ufl.replace(r_p, {TestFunction(self._W3), self._mptest}) \ File "/Users/eikemueller/PostDocBath/EllipticSolvers/ufl/build/lib/ufl/algorithms/replace.py", line 61, in replace mapping2 = dict((k, as_ufl(v)) for (k, v) in iteritems(mapping)) File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/six.py", line 484, in iteritems return iter(getattr(d, _iteritems)(**kw)) AttributeError: 'set' object has no attribute ‘iteritems’ Thanks, Eike -- Dr Eike Hermann Mueller Research Associate (PostDoc) Department of Mathematical Sciences University of Bath Bath BA2 7AY, United Kingdom +44 1225 38 5803 e.mueller@bath.ac.uk http://people.bath.ac.uk/em459/
On 22 Jan 2015, at 15:27, Lawrence Mitchell <lawrence.mitchell@imperial.ac.uk> wrote:
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On 22/01/15 15:17, Eike Mueller wrote:
Dear firedrakers,
assume I want to do the following solve of a mixed system:
V1 = FunctionSpace(mesh, 'RT', 1) V2 = FunctionSpace(mesh, 'DG', 0)
W = V1 * V2 lmbda = 1 u, p = TrialFunctions(W) v, q = TestFunctions(W) f = Function(V1) g = Function(V2)
a = (p*q - q*div(u) + lmbda*inner(v, u) + div(v)*p)*dx
L = (dot(u,f)+p*g)*dx
u = Function(W) solve(a == L, u, solver_parameters=...)
But now I take out the line
L = (dot(u,f)+p*g)*dx
and assume that somewhere I calculate instead:
L1 = dot(TestFunction(V1),f)*dx L2 = TestFunction(V2)*g*dx
Can you define these two forms using the test functions v and q respectively (rather than building new test functions on the subspaces)? Then everything should "just work".
Alternately, if you haven't already assembled L1 and L2, you could (to get L), do:
v1 = TestFunction(V1) v2 = TestFunction(V2)
L1 = dot(v1, f)*dx L2 = v2*g*dx
import ufl L1p = ufl.replace(L1, {v1, v}) L2p = ufl.replace(L2, {v2, v})
L = L1p + L2p
but that's effectively the same as just defining L1 and L2 using v and q rather v1 and v2. I guess you're separately using L1 and L2 somewhere in a non-mixed solve?
Cheers,
Lawrence
Cheers,
Lawrence -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ <http://www.enigmail.net/>
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