Consider two functions u \in U and v \in V, where V is a subspace of U.
I would like to copy a number of DOfs from v to u:
uVec = u.vector()
vVec = v.Vector()
uVec[indexDOFs] = vVec
(indexDOFs is a vector containing the DOFs to be copied)
How can I do that in parallel with MPI?