| kernel3d {splancs} | R Documentation |
Compute the space-time kernel
kernel3d(pts, times, xgr, ygr, tgr, hxy, ht)
pts |
A matrix of event coodinates x,y. |
times |
A vector of event times, t. |
xgr |
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. |
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)].
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.