Find dof indices in a mixed function space

Question

Hello
I have a mixed function space

V = VectorFunctionSpace(mesh, 'CG', 2)
W = FunctionSpace(mesh, 'CG', 1)
X = MixedFunctionSpace([V, W])

u = Function(X)

How can get the indices of the dofs in u corresponding to the space W ?

Thanks

Answer 1

Hi, use

dofs_W = X.sub(1).dofmap().dofs()
print u.vector()[dofs_W].array()