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&CELL: PERIODICITY

direction

The direction in which the cell is infinitely repeated. Can have one of the following 3 values:

Direction Meaning Coordinate system
X Cell repeats in x Cartesian
Y Cell repeats in y Cartesian
PHI Axial periodicity around the origin Polar or Tube

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 in which an r-periodicity would be equivalent to an x-periodicity with non-constant intervals. This is technically difficult to deal with. Contact the author if there is a genuine need for such a periodicity.

length

The length of one full period, expressed in cm for x and y periodicities and in degrees for periodicity in phi.
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Formatted on 15/01/01 at 23:07.