Puts the lowest id node among every dyad as source (and the other as target)
Details
edge.list transforms the input into a two-elements list containing a
dataframe of nodes (with columns “id” and “label”) and a
dataframe of edges. The last one is numeric (with columns “source”
and “target”) and based on auto-generated nodes' ids.
See also
Other manipulation:
check.dpl.edges()