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[Nuno David Lopes <ndl@xxxxxxxxxxxxxx>]

Isn't the code:
......................
Matrix A;
Vector b,x;
assemble(A,a,mesh);
assemble(b,L,mesh);
solver.solve(A,x,b);
Function up(mesh,x,a); //up=(u,p) velocities and pressure
Function u=up[0];
Function p=up[1]; 
........................... 
supposed to work?
this gives an error:
----------------------
conversion from 'dolfin::SubFunction' to non-scalar type 'dolfin::Function' 
requested
--------------------

On the other hand I know that this works:
Function u(up[0]);
Function p(up[1]);

-- 
Nuno David Lopes