Hello,
I tried to read the source file related to variograms in the "spatial"
package.
I copied part of the source file of "spatial" package as follows,
in the follwing lines, I want to read "VR_variogram" function, from
wrapped in .C(), I suppose it is a C function..
I searched in various sub directories of R, but I could not seem to find
it..
DOes anyone know where can I find it?
thanks a lot in advance!
yan
-----------------------------------
315 variogram <- function(krig, nint, plotit=TRUE, ...)
316 {
317 z <- .C("VR_variogram",
318 xp = double(nint),
319 yp = double(nint),
320 nint = as.integer(nint),
321 as.double(krig$x),
322 as.double(krig$y),
323 if(krig$np > 0) as.double(krig$wz) else
as.double(krig$z),
324 as.integer(length(krig$x)),
325 cnt = integer(nint),
326 PACKAGE = "spatial"