R Under development (unstable) (2024-02-11 r85891 ucrt) -- "Unsuffered Consequences"
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> library(pcalg)
> suppressWarnings(RNGversion("3.5.0"))
> set.seed(123)
> 
> ## expl 1
> g1 <- randomDAG(5,0.5)
> g2 <- randomDAG(5,0.5)
> res1 <- (shd(g1,g2)==4)
> 
> ## expl 2
> g3 <- dag2cpdag(g1)
> res2 <- (shd(g3,g1)==3)
> 
> if(!all(c(res1,res2))) {
+   stop("Test of shd: Theoretical value not matched!")
+ }
> 
> proc.time()
   user  system elapsed 
   1.26    0.29    1.51