> Among the definitions that are commonly used, you will find:
>
> L1 norm: equals(a, b, tolerance) = sum(abs(a-b)) < tolerance
> L2 norm: equals(a, b, tolerance) = sqrt(sum((a-b)^2)) < tolerance
> L-infinity norm: equals(a, b, tolerance) = max(abs(a-b)) < tolerance
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I was thinking of that one. [Actually, I use it in unit tests...]
[The L2-norm is already available through the "distance" method.]
Gilles
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