R: Nearest neighbour distances as used by Fhat()

nndistF {splancs} | R Documentation

## Nearest neighbour distances as used by Fhat()

### Description

Calculate nearest neighbour distances as used by `Fhat()`

### Usage

    nndistF(pts1,pts2)

### Arguments

`pts1` | A points data set
`pts2` | A points data set

### Value

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

### 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: http://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")

[Package splancs version 2.01-40 Index]