Thank you very much. It works now.
Am Mittwoch, den 06.04.2011, 23:18 +0800 schrieb D. S. McNeil:
> > I want to show a tree with edge labels. I tried out
> >
> > G1 = Graph({1:{5:0},2:{5:1},3:{6:1},4:{7:0},5:{6:0},6:{7:1}})
> > show(G1,edge_labels=true)
> > show(G1,layout="tree",edge_labels=true)
> >
> > In the first graphic the labels are positioned on the edges but in the
> > second one they are not. Why is this? How can I get it right?
>
> I think this is related to
> http://trac.sagemath.org/sage_trac/ticket/10124, or at least my
> patched version seems to work. The basic problem is that
> graph_plot.py has problems with integer positions because integer
> division is truncating in Python 2 and it's easy to forget to handle
> the integer case when your inputs are typically floats. (This problem
> goes away in Python 3.)
>
> You could either apply the posted patch, or -- as a hack which doesn't
> require any rebuilding -- you could type the following before you plot
> G1:
>
>
> # trac #10124 partial monkeypatch
> def set_pos(self):
> self._pos = self._graph.layout(**self._options)
> self._pos = dict((k,(float(v[0]), float(v[1]))) for k,v in
> self._pos.iteritems())
>
> import sage.graphs.graph_plot
> sage.graphs.graph_plot.GraphPlot.set_pos = set_pos
>
>
> which should work around the problem in the meantime, unless this
> coffee hasn't kicked in yet..
>
>
> Doug
>
> --
> Department of Earth Sciences
> University of Hong Kong
>
--
Prof. Dr. Ulrich Tipp
FB 03 Elektrotechnik und Informatik
Hochschule Niederrhein
Reinarzstr. 49
47805 Krefeld
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