Extracts edge information from the input graph.
the input graph, of any type.
a data frame with the following variables:
v name of the start node.
w name of the end node. For symmetric edges (bidirected and undirected), the order of start and end node is arbitrary.
e type of edge. Can be one of
x X coordinate for a control point. If this is not
NA, then the edge
is drawn as an
xspline through the start point, this control point,
and the end point. This is especially important for cases where there is more than
one edge between two variables (for instance, both a directed and a bidirected edge).
y Y coordinate for a control point.
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