Salut Nicolas et Vincent,
I am trying to use the graphviz functionalities you added in ticket
#7004. So, I installed graphviz and the dot2tex spkg as explained in
the documentation of layout_graphviz method, but I get the following
error when I use it :
sage: g = Graph({2:[3,4]})
sage: g.layout_graphviz()
Traceback (most recent call last):
...
UnboundLocalError: local variable 'positions' referenced before assignment
Are you able to make this (or any) example to work? How should I use it?
Thank you,
Sébastien
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