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[Kent Andre <kent-and@xxxxxxxxx>]

Hi, it seems that when I 
have one GenericVector and one Vector I can 
only add these together, not subtract them. 

I'd like to subtract them as well :) 

The following illustrate the problem:  


from dolfin import *


mesh = UnitSquare(12,12)
V = FunctionSpace(mesh, "CG", 1)
v = TestFunction(V)
f = Function(V)
s = Constant(mesh, 1.0)

L = s*v*dx  

b = assemble(L)


x = b + f.vector()
x = b - f.vector()