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On Fri, 9 Feb 2001, John S. Denker wrote
At 08:12 AM 2/9/01 -0500, Ludwik Kowalski wrote:
>1) Is it appropriate to perform simple averaging for usual
>cylindrical cells (dr=const)?
and went on to give the essential theory. To put it into practice
here's what I did (and, I assume, what others are doing as well.)
The key difference is the first derivative term in the cylindrical
Laplacian which involves r itself. This means that we need a
radial coordinate which can be simply generated as an index along
the side of the "universe."
27 ^ (+ r direction)
24 d a b -> (+z direction
21 <-(radial index)