R Under development (unstable) (2024-09-04 r87094 ucrt) -- "Unsuffered Consequences"
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> # test -- load data:
> library(sp)
> data(meuse)
> coordinates(meuse) = ~x+y
> data(meuse.grid)
> gridded(meuse.grid) = ~x+y
> 
> library(gstat)
> # test -- idw
> meuse.grid$idw <- idw0(zinc~1, meuse, meuse.grid)[,1]
> x <- idw(zinc~1, meuse, meuse.grid)
[inverse distance weighted interpolation]
> all.equal(x$var1.pred, meuse.grid$idw)
[1] TRUE
> spplot(meuse.grid["idw"],col.regions=bpy.colors())
> v = vgm(1, "Exp", 500)
> # test sk:
> x0 <- krige0(zinc~1, meuse, meuse.grid, v, beta = 500, computeVar = TRUE)
> rownames(x0$pred)=NULL
> x <- krige(zinc~1, meuse, meuse.grid, v, beta = 500)
[using simple kriging]
> all.equal(x$var1.pred, x0$pred[,1])
[1] TRUE
> all.equal(x$var1.var, x0$var)
[1] TRUE
> # test ok:
> x0 <- krige0(zinc~1, meuse, meuse.grid, v, computeVar = TRUE)
> rownames(x0$pred)=NULL
> names(x0$var)=NULL
> x <- krige(zinc~1, meuse, meuse.grid, v)
[using ordinary kriging]
> all.equal(x$var1.pred, x0$pred[,1])
[1] TRUE
> all.equal(x$var1.var, x0$var)
[1] TRUE
> # test uk:
> x0 <- krige0(zinc~sqrt(dist), meuse, meuse.grid, v, computeVar = TRUE)
> rownames(x0$pred)=NULL
> names(x0$var)=NULL
> x <- krige(zinc~sqrt(dist), meuse, meuse.grid, v)
[using universal kriging]
> all.equal(x$var1.pred, x0$pred[,1])
[1] TRUE
> all.equal(x$var1.var, x0$var)
[1] TRUE
> 
> proc.time()
   user  system elapsed 
   2.57    0.48    3.03