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Layout as a circle_tree
as_circle_tree()
A two-column matrix, each row giving the coordinates of a vertex, according to the ids of the vertex ids.
Other layout: as_arc(), as_line(), as_polyarc(), as_polycircle(), as_polygon(), c_net_layout()
as_arc()
as_line()
as_polyarc()
as_polycircle()
as_polygon()
c_net_layout()