> > I am not sure Injection is going to "do the right thing" when you move > between spaces. At least my memory of the implementation > was that it just did local interpolation, which is not right when injecting > P0 into P1.
Ah, that could be the case. For discontinuous things I think what you want is the L2 projection of the fine function into the coarse space (which on nested meshes you can compute locally), this is what I implemented in Firedrake IIRC. I agree that point interpolating won't work, and I guess in that case some kind of scaling of a dual thing is approximating the L2 projection. Lawrence
