libpysal.weights.
lat2SW
(nrows=3, ncols=5, criterion='rook', row_st=False)[source]¶Create a sparse W matrix for a regular lattice.
number of rows
number of columns
type of contiguity. Default is rook.
If True, the created sparse W object is row-standardized so every row sums up to one. Defaults to False.
instance of a scipy sparse matrix
Notes
Observations are row ordered: first k observations are in row 0, next k in row 1, and so on. This method directly creates the W matrix using the strucuture of the contiguity type.
Examples
>>> from libpysal.weights import lat2SW
>>> w9 = lat2SW(3,3)
>>> w9[0,1] == 1
True
>>> w9[3,6] == 1
True
>>> w9r = lat2SW(3,3, row_st=True)
>>> w9r[3,6] == 1./3
True