Please have a look at the geostatistics packages refered to from
http://sal.agecon.uiuc.edu/csiss/Rgeo/
BTW -- is this page referenced from the R or CRAN home pages? I couldn't find a link a few days ago.
Most of them may do what you want. I assume they can all be fooled by providing one-dimensional data having a constant second coordinate. Package gstat allows explicit specification of one-dimensional data sets, but has no special provisions for 1D data in terms of efficiency, compared to 2D data. -- Edzer
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