Nearest neighbour distances as used by Fhat()
Calculate nearest neighbour distances as used by Fhat()
nndistF(pts1,pts2)
pts1 |
A points data set |
pts2 |
A points data set |
The set of distances from each of the points in pts2 to the nearest
point in pts1 is returned as a vector.
Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern analysis code in S-Plus. Computers and Geosciences, 19, 627-655; the original sources can be accessed at: https://www.maths.lancs.ac.uk/~rowlings/Splancs/. See also Bivand, R. and Gebhardt, A. 2000 Implementing functions for spatial statistical analysis using the R language. Journal of Geographical Systems, 2, 307-317.
data(uganda) boxplot(nndistF(as.points(uganda), as.points(csr(uganda$poly, length(uganda$x))))) plot(ecdf(nndistF(as.points(uganda), as.points(csr(uganda$poly, length(uganda$x))))), main="Fhat ecdf Uganda volcano data")
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