Hi,
I created a simple graph by commanding:
a=Graph({0:[1,2],2:[3,4],1:[5,6]})
and plot it in tree layout:
a.plot(layout='tree',tree_root=0,tree_orientation='down')
However, the tree ploted will arrange the vertices unexpectedly
because the edges for instance (1,5) and (2,4) are intersected. It
seems sage will position the vertices of the same level according to
their labels. Is there anyway to override it and keeps the edge from
crossing another one? Thx.
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