Once the x-direction length of the new device is defined, the user have, obviously, to define the number of cells in the x-direction. This is done in order to solve every equations of the simulation in the finite-difference approximation context. The bigger is the number of cells in the x-direction the best will be the accuracy in that direction (at least for the specific equations the author have implemented in this actual version of **GNU Archimedes**), but the user will pay the better accuracy in a more long run-time. So, pay attention in the choice of this number of cells. Usually, a grid of
is enough for the majority of devices, but it strongly depends on the device structure and the requirements of the user. To specify, for example,
cells in the x-direction, the following line have to be typed in the input file

XSPATIALSTEP 100

Didier Link 2007-05-18