&CELL: PERIODICITY
The direction in which the cell is infinitely repeated. Repetition
in r is not permitted because of the method used to calculate the
potentials in cylindrical geometry.
Cylindrical geometries are handled via a conformal mapping onto a
Cartesian coordinate system. An r-periodicity would becomes an
x-periodicity with non-constant intervals, which is technically
difficult to deal with. Contact the author if there is a need for
such a periodicity.
The length of one full period in cm for x and y periodicities and
in degrees for periodicity in phi.
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Formatted on 0100-09-02 at 06:56.