Calculate the theoretical nearest neighbour distribution function.
The density of the point pattern, i.e. the number of points per unit area.
A vector of distances at which to evaluate Fzero
Fzero returns the nearest neighbour distribution for a homogeneous planar
Poisson process. In fortran notation, Fzero(s) is
FZERO = 1-EXP(-PI*DENSITY*(S**2)).
A vector of the same length as
s, containing the value of Fzero at the
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.
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