On Thu, Jul 9, 2009 at 6:12 PM, Kitty Lee<lee.ki...@yahoo.com> wrote:
>
> Hi. I have a dataset of unique coordinates (no missing coordinates). When I
> did the following:
>
> lonlat<-mydata[, c("lon, "lat")]
> sp1<-corSpatial(1,form=~lon+lat,type="g")
> scor<-Initialize(sp1, lonlat , nugget=FALSE)
>
> I got a value for sp1 (2.67). But got an error message for scor--Error in
> getCovariate.corSpatial(object, data = data) :
> Cannot have zero distances in "corSpatial"
>
> I find that puzzling since I have unique coordinates and there should not be
> any zero distances. Any idea?
The error does suggest the function thinks there are duplicates in
lonlat. Have you tried, for example, sum(duplicated(lonlat))? Or you
could add a small amount of random noise to one of the coordinates and
then see if Initialize will run...
hth,
Kingsford Jones
>
> Thanks!
>
> K.
>
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