Someone has pointed out that my question was not clear. With a clear danger of
sounding really stupid, I will try to clarify
Say I have a polygon, which I convert to raster format so each cell is n by n.
For some reason I select a set of cells
and have a neat rectangle such as below. To get a neighbor list for such a grid
I could use cell2nb(3, 8) would be fine
1 1 1 0 0 1 0 1
0 1 1 0 1 1 1 0
1 1 0 0 1 1 1 1
However say my grid came from the full map and looked something like this
0 1 0 0 1
0 1 1 0 1 1 1
0 0 1 1 1
0 0 1 0 1
1 1 0 1 1 1
1 0 0 1
1 1 1 0 0
0 1 1
The number of rows is clear, however, what is the number of columns (and
anyway, what R function do you use to get the
dimensions of a SpatialGridDataFrame object.
Ronnie
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