Still have not solved this problem with package 'spdep'. It appears localG()
cannot handle either SpatialPoints or a matrix of point coordinates that are
not in a rectangular matrix when plotted. It cannot take NaN values and,
after I successfully used dnearnigh() to create an "nb" object for ONLY
Northeast land points and converted to a 'listw' object, it still returned
the same error. See below ("points" is a 2-column matrix of lat-long point
coordinates; diffD is my data matrix):
/ > neigh2 = dnearneigh(points,0,5,longlat=TRUE)
> mylist = nb2listw(neigh2,style="B")
> stats = localG(diffD,mylist)
Error in matrix(0, nrow = nrow(x), ncol = ncol(x)) :
invalid 'ncol' value (too large or NA)/
Again, if anyone thinks this analysis is incorrect, please let me know. If
not, I'll just abandon R for this portion of the project, as it is taking
far too long to use this this package with Getis-Ord statistics, which
should run fairly easily.
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