[BioC] [igraph] Rgraphviz: how to read a \"dot\" file?

Gábor Csárdi csardi at rmki.kfki.hu
Tue Oct 16 21:18:14 CEST 2012

On Tue, Oct 16, 2012 at 12:41 PM, Sam Steingold <sds at gnu.org> wrote:
>> * Kasper Daniel Hansen <xunafra at wufcu.rqh> [2012-10-16 11:23:35 -0400]:
>>> 2. when I manually expand the path, it segfaults:
>>>  *** caught segfault ***
>>> address 0x18, cause 'memory not mapped'
>>> Traceback:
>>>  1: graphLayout(g)
>>>  2: agread("/home/sds/xgraph/share-click/2012-10-09/country-graph.dot")
>> Can you send me the dot file?  The segfault probably comes from
>> Graphviz, suggesting that igraph has produced an invalid file.  It
>> would of course be nice for us to catch the exception, but I am not
>> sure I have resources to fix this.

Yes, it might be an igraph bug, as
http://www.graphviz.org/doc/info/lang.html says that node ids cannot
start with numbers and the files igraph exports they are just numbers.
I am wondering how this ever worked.



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