R Under development (unstable) (2024-02-05 r85863 ucrt) -- "Unsuffered Consequences"
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> library(pcalg)
> 
> ## expl 1
> amat1 <- cbind(c(0,1),c(1,0))
> g1 <- as(amat1,"graphNEL")
> d1 <- pdag2dag(g1)
> res1 <- all(cbind(c(0,0),c(1,0))==wgtMatrix(d1$graph))
> 
> ## expl2
> amat2 <- cbind(c(0,0,1),c(1,0,1),c(0,1,0))
> g2 <- as(amat2,"graphNEL")
> d2 <- pdag2dag(g2)
> amatT2 <- cbind(c(0,1,0),c(0,0,0),c(1,1,0))
> res2 <- all(amatT2==wgtMatrix(d2$graph))
> 
> ## expl3 - not extendable
> amat3 <- cbind(c(0,1,0,1),c(1,0,1,0),c(0,1,0,1),c(1,0,1,0))
> g3 <- as(amat3,"graphNEL")
> d3 <- pdag2dag(g3)
> res3 <- !d3$success
> 
> ## expl4 - labels (bug: 24Mar2015)
> amatT4 <- cbind(c(0,0,0), c(1,0,0), c(1,1,0))
> colnames(amatT4) <- rownames(amatT4) <- c("cxs", "def", "dfe")
> m <- rbind(c(0,1,1), c(1,0,1), c(1,1,0))
> colnames(m) <- rownames(m) <- c("cxs", "def", "dfe")
> g <- as(m, "graphNEL")
> res4 <- identical(wgtMatrix(pdag2dag(g)$graph), amatT4)
> 
> if (!all(c(res1,res2,res3,res4))) {
+   stop("Test of pdag2dag: Problem when extending PDAG!")
+ }
> 
> proc.time()
   user  system elapsed 
   1.14    0.15    1.28