[R-sig-Geo] Data grid in kriging?

[riaarinda]

You say that data.grid can be any spatial object for which I would like
predictions. How could I create it? 
I have successfully done sp1 = SpatialPointsDataFrame(coordinates(sp0), data
= sp0 at data),
but when I tried gridded(sp1) = TRUE, an error came; "suggested tolerance
minimum: 0.0764967. Error in points2grid(points, tolerance, round) :
dimension 1 : coordinate intervals are not constant"
And when I tried fullgrid(sp1) <- TRUE, another error came ; "Error in
function (classes, fdef, mtable)  : 
  unable to find an inherited method for function "fullgrid<-", for
signature "SpatialPointsDataFrame", "logical""

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