R Under development (unstable) (2023-09-30 r85239 ucrt) -- "Unsuffered Consequences"
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> options("rgdal_show_exportToProj4_warnings"="none")
> library(sp)
The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
which was just loaded, were retired in October 2023.
Please refer to R-spatial evolution reports for details, especially
https://r-spatial.org/r/2023/05/15/evolution4.html.
It may be desirable to make the sf package available;
package maintainers should consider adding sf to Suggests:.
> 
> # 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 
   0.25    0.04    0.28