R Under development (unstable) (2024-02-11 r85891 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(pcalg)
> 
> m <- matrix(FALSE, 3,3)
> tmp <- list(NULL, NULL, NULL)
> 
> (pag0 <- udag2pag(m, sepset = rep(tmp, 3)))
     [,1] [,2] [,3]
[1,]    0    0    0
[2,]    0    0    0
[3,]    0    0    0
> stopifnot(is.numeric(pag0))
> 
> 
> proc.time()
   user  system elapsed 
   1.29    0.21    1.50