I can also reproduce this, but this code has not been changed in several
years.

I consider graphviz_draw() to be largely deprecated (in favor of
graph_draw()), since the graphviz interface is fairly buggy and
inconvenient.

I'm planning to remove this function altogether in new releases, and I'm
not very inclined to debug it.

Best,
Tiago

Am 17.08.20 um 17:44 schrieb Jeff Trull:
> I can reproduce this.
>
> On Mon, Aug 17, 2020 at 1:29 AM Rolf Sander <rolf.sander@mpic.de
> <mailto:rolf.sander@mpic.de>> wrote:
>
>     Hello,
>
>     I get a segmentation fault when trying to plot a loop with
>     graphviz_draw(). Here is a minimal example to reproduce the error:
>
>     import graph_tool.all as gt
>     g = gt.Graph()
>     v0 = g.add_vertex()
>     v1 = g.add_vertex()
>     e01 = g.add_edge(v0,v1)
>     e11 = g.add_edge(v1,v1) # loop
>     gt.graphviz_draw(g)
>
>     I have version 2.33 of python3-graph-tool installed on my computer which
>     runs on Linux Mint 19.2 Tina (based on Ubuntu 18.04 LTS, bionic). My
>     graphviz version is 2.40.1-2.
>
>     It works fine if I don't add the loop e11 to the graph.
>
>     It works fine if I use gt.graph_draw() instead of gt.graphviz_draw()
>
>     It works fine if I use graphviz directly (via a .dot file).
>
>     It did work fine in earlier versions of graph_tool.
>
>     Can anyone reproduce this?
>
>     Best regards
>     Rolf
>
>     --
>     -----------------------------------------------------------------------
>        Rolf Sander                              phone: [+49] 6131/305-4610
>        Max-Planck Institute of Chemistry        email:
>     rolf.sander@mpic.de <mailto:rolf.sander@mpic.de>
>        PO Box 3060, 55020 Mainz, Germany     homepage:
>     www.rolf-sander.net <http://www.rolf-sander.net>
>     -----------------------------------------------------------------------
>                    https://www.encyclopedia-of-geosciences.net
>                  https://www.geoscientific-model-development.net
>     -----------------------------------------------------------------------
>     _______________________________________________
>     graph-tool mailing list
>     graph-tool@skewed.de <mailto:graph-tool@skewed.de>
>     https://lists.skewed.de/mailman/listinfo/graph-tool
>
>
> _______________________________________________
> graph-tool mailing list
> graph-tool@skewed.de
> https://lists.skewed.de/mailman/listinfo/graph-tool
>


--
Tiago de Paula Peixoto <tiago@skewed.de>

_______________________________________________
graph-tool mailing list
graph-tool@skewed.de
https://lists.skewed.de/mailman/listinfo/graph-tool