libpysal.weights.ODW¶

libpysal.weights.ODW(Wo, Wd, transform='r', silence_warnings=True)[source]¶

Constructs an o*d by o*d origin-destination style spatial weight for o*d flows using standard spatial weights on o origins and d destinations. Input spatial weights must be binary or able to be sutiably transformed to binary.

Parameters:

WoW object for origin locations: o x o spatial weight object amongst o origins
WdW object for destination locations: d x d spatial weight object amongst d destinations
transformTransformation for standardization of final OD spatial weight; default: is ‘r’ for row standardized

Returns:

wwspatial contiguity W object for assocations between flows: o*d x o*d spatial weight object amongst o*d flows between o origins and d destinations

Examples

>>> import libpysal
>>> O = libpysal.weights.lat2W(2,2)
>>> D = libpysal.weights.lat2W(2,2)
>>> OD = libpysal.weights.ODW(O,D)
>>> OD.weights[0]
[0.25, 0.25, 0.25, 0.25]
>>> OD.neighbors[0]
[5, 6, 9, 10]
>>> OD.full()[0][0]
array([0.  , 0.  , 0.  , 0.  , 0.  , 0.25, 0.25, 0.  , 0.  , 0.25, 0.25,
       0.  , 0.  , 0.  , 0.  , 0.  ])