NB. 'tree' always generates random tree with a root 0. NB. 'rtee' generates random tree with random root. NB. 'qtree' is also known as 'function digraph'
rtree =: tree ({ /: ]) ?~
edgelist from predecessor
edgelist=: ,. [EMAIL PROTECTED]
NB. example
edgelist p=.rtree 10
show p
edgelist p=.qtree 10
show p
NB. <root is self-loop>
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