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[Gideon Simpson <grs2103@xxxxxxxxxxxx>]

suppose I solve a PDE using dolfin and have my solution in

Function u;

Now suppose i want to do two things:

1. I want to compute and plot the pointwise error in the l2 norm:  so  
if I have a function u_exact, i want to compute

Function err = fabs(u-u_exact);

2. I want to compute the avg, min, max of the l2 error:  I gather I  
can do this using a Form with a functional, but is that the only way?