R Under development (unstable) (2024-09-04 r87094 ucrt) -- "Unsuffered Consequences"
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> library(gstat)
> d=expand.grid(x=c(-.5,.5), y=c(-.5,.5))
> d$z=1:4
> vv=vgm(model = "Tab",  covtable = 
+ 	variogramLine(vgm(1, "Sph", 1), 1, n=1e4,min = 0, covariance = TRUE))
> vv
  model psill maxdist
1   Tab    NA       1
covariance table:
[1] 1.0000000 0.7039712 0.4319496 0.2080384 0.0560108 0.0000000
> krige(z~1,~x+y,d,data.frame(x=0,y=0),vgm(1, "Sph", 1))
[using ordinary kriging]
  x y var1.pred var1.var
1 0 0       2.5 1.017767
> krige(z~1,~x+y,d,data.frame(x=0,y=0),vv)
[using ordinary kriging]
  x y var1.pred var1.var
1 0 0       2.5 1.017863
> krige(z~1,~x+y,d[1:2,],data.frame(x=0,y=0),vgm(1, "Sph", 1))
[using ordinary kriging]
  x y var1.pred var1.var
1 0 0       1.5 1.267767
> krige(z~1,~x+y,d[1:2,],data.frame(x=0,y=0),vv)
[using ordinary kriging]
  x y var1.pred var1.var
1 0 0       1.5 1.267863
> 
> proc.time()
   user  system elapsed 
   1.07    0.17    1.20