This is a bug. Thank you for reporting it.
On Sat, Oct 8, 2011 at 11:19 AM, Zheng <zh.han...@gmail.com> wrote:
> 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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