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|Real||norm (const BoxLayoutData< FArrayBox > &A, const Interval &interval, const int &p=2)|
not actually L-p norms, since it doesn't take into account the dx of the system. A user can take that into account or not.
For p != 0, returns pth root of sum of pth powers over all points in all fabs and all components in the interval:
( sum [ |A[i][pt,var]|^p : FArrayBox A[i], point pt in A[i].box(), var in interval ] )^(1/p)
To turn into an L-p norm, one needs to multiply this by dx^(SpaceDim/p).
For p == 0, returns global max over all points in all fabs and all components in the interval:
max [ |A[i][pt,var]| : FArrayBox A[i], point pt in A[i].box(), var in interval ]
Some people don't like that this norm is not normalized based on number of points in A. Normalization is your problem.