-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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/ iQEcBAEBAgAGBQJUwRbFAAoJECOc1kQ8PEYvJHAH/17RtMO14gh60/jIOLFNPxJ0 AkYpR2T44g0oE0/5U2Kw3daLYl3cW1KKi9f5W2FpTy/qmCFL1pJu3qSf1hzIzktT bAdZPm1fxJXychDrZMwT+zPWDJtVHQONvX7ESBnsUmXbFz493J3nktL70DW2ovnM bdS1CDlWEBcqweQG6w7GGI/0bdrf3BYH8o9nt/PCq1Xcl6ItvUiktBwegFlRlaP/ HT0pMPKASdKgtCFqHgLolZW0oiUrnekqDePTz68rzn+FUp2llYwA+YnOFUTcJ0tB x4fbsnh4ktJIg06R3jtqpZFFQuOxwvNVEqALE0FWSjPcpTWVls/VHa/w9PdIBqQ= =tndm -----END PGP SIGNATURE-----