graph - How can I plot a tree on R with several parents for a node? -


i'm trying plot tree-like graph on r

this expect

here goes code (i'm using library "data.tree"):

library(data.tree)  <- node$new("a") b <- node$new("b") c <- node$new("c") d <- node$new("d")  a$addchildnode(b) a$addchildnode(c)  b$addchildnode(d) c$addchildnode(d)  plot(a)

but got


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