libpysal.weights.hexLat2W

libpysal.weights.hexLat2W(nrows=5, ncols=5, **kwargs)

Create a W object for a hexagonal lattice.

Parameters:

nrowsint

number of rows

ncolsint

number of columns

**kwargskeyword arguments

optional arguments for pysal.weights.W

Returns:

wW

instance of spatial weights class W

Notes

Observations are row ordered: first k observations are in row 0, next k in row 1, and so on.

Construction is based on shifting every other column of a regular lattice down 1/2 of a cell.

Examples

>>> from libpysal.weights import lat2W, hexLat2W
>>> w = lat2W()
>>> w.neighbors[1]
[0, 6, 2]
>>> w.neighbors[21]
[16, 20, 22]
>>> wh = hexLat2W()
>>> wh.neighbors[1]
[0, 6, 2, 5, 7]
>>> wh.neighbors[21]
[16, 20, 22]