R Under development (unstable) (2024-04-29 r86495 ucrt) -- "Unsuffered Consequences"
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> options("rgdal_show_exportToProj4_warnings"="none")
> library(sp)
> 
> # open polygon:
> print(point.in.polygon(1:10,1:10,c(3,5,5,3),c(3,3,5,5)))
 [1] 0 0 3 1 3 0 0 0 0 0
> # closed polygon:
> print(point.in.polygon(1:10,rep(4,10),c(3,5,5,3,3),c(3,3,5,5,3)))
 [1] 0 0 2 1 2 0 0 0 0 0
> 
> proc.time()
   user  system elapsed 
   0.34    0.14    0.45