splancs (version 2.01-45)

nndistF: Nearest neighbour distances as used by Fhat()

Description

Calculate nearest neighbour distances as used by Fhat()

Usage

nndistF(pts1,pts2)

Value

The set of distances from each of the points in pts2 to the nearest point in pts1 is returned as a vector.

Arguments

pts1

A points data set

pts2

A points data set

References

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.

See Also

nndistG, Fhat, Ghat, Fzero

Examples

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")