The values of x at which to compute the kernel function.
ygr
The values of y at which to compute the kernel function.
tgr
The values of t at which to compute the kernel function.
hxy
The quartic kernel width in the x and y direction.
ht
The quartic kernel width in the temporal direction.
Value
A list is returned. Most of the components are just copies of the
input parameters, except for the $v parameter.
This is a three dimensional array containing the kernel-smoothed
values. Its dimension is
[length(xgr),length(ygr),length(tgr)].
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.