$CellNumber
Format
$CellNumber Nx Ny Nz // where Nx, Ny, Nz are integers.
This defines the total number of nodes in x, y, and z directions. Note that this function is not include the layer of PML. That is, the total number of nodes in simulation may NOT be .
NOTE 1: The priority of this function is below the function -- $Deltaxyz, i.e., the program abandons $CellNumber while using $Deltaxyz.
NOTE 2: Since the position of the last point would not be beyond the boundary we set in $SpaceRegion, the mesh size may be different with what we think on intuition. For instance, if Nx=101 from x=0~100e-9 (m), dx = 100e-9/(101-1+0.5) ~9.95e-10 (m).
Example
$CellNumber 201 201 201
Thus, without PML, there is 201 nodes in x direction, so as the number of nodes are in y and z direction.