R Under development (unstable) (2024-04-29 r86495 ucrt) -- "Unsuffered Consequences"
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> options("rgdal_show_exportToProj4_warnings"="none")
> library(sp)
> 
> g = SpatialGrid(GridTopology(c(0,0), c(1,1), c(3,3)))
> p = as(g, "SpatialPolygons")
> over(g,g)
1 2 3 4 5 6 7 8 9 
1 2 3 4 5 6 7 8 9 
> 
> 
> 
> proc.time()
   user  system elapsed 
   0.29    0.12    0.40