[R] Cross-variograms

Edzer J. Pebesma e.pebesma at geog.uu.nl
Tue Aug 17 11:18:34 CEST 2004

Jacques, provided that X and Y are colocated (i.e., have
exactly the same observation locations), you get the
cross variogram right; the definition of this cross
variogram is however:

gamma(h)= E[(X(s)-X(s+h))*(Y(s)-Y(s+h))]

also, where you select:

cv <- v$gamma[1:14]

you may be better off using the more general

v$gamma[v$id == "X.Y"]

Best regards,

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