Re: [igraph] RuntimeWarning when reading GraphML

[Gábor Csárdi]

On Fri, Feb 6, 2009 at 6:26 PM, Chris Wj <address@hidden> wrote:
> <data key="id">n3</data>
> -> Is the data line for id common? Do you see it used often without the 'id'
> attribute in the 'node' tag?

Personally, I don't see many GraphML files.

> As it stands now, will the 'id' attribute of the 'node' (<node id="n3">) tag
> always take priority over the 'data' tag?

It is the opposite, I believe.

G.

> -Chris
>
> On Fri, Feb 6, 2009 at 11:14 AM, Gábor Csárdi <address@hidden> wrote:
>>
>> I don't know. I am not sure what to do with 'id' attributes. Basically
>> there are two questions here:
>>
>> 1) Whether to read the <node id="n3"> type of ids from the graph, or
>> not. It they are not read, then we might lose some information. If
>> they are read, that could lead to confusion.
>> 2) Whether to use the "id" (igraph) vertex attribute as <node id="n3">
>> type of ids, when we write out a GraphML file. Perhaps not.
>>
>> What we could do is to read the <node id="n3"> type of ids into an
>> attribute called "GraphML:id" and use "GraphML:id" for the same
>> purpose when we write GraphML files.
>> (Or maybe some similar name, without a ":".)
>>
>> G.
>>
>> On Fri, Feb 6, 2009 at 2:41 PM, Chris Wj <address@hidden> wrote:
>> > I assigned graph, vertex, and edge attributes to a graph and saved it to
>> > GraphML. When I read it in again, I get this message:
>> >
>> >
>> > /usr/lib/python2.5/site-packages/python_igraph-0.6-py2.5-linux-x86_64.egg/igraph/__init__.py:1106:
>> > RuntimeWarning: Could not add vertex ids, there is already an 'id'
>> > vertex
>> > attribute at foreign-graphml.c:370
>> >
>> > The GraphML file gets the 'id' data element for each node:
>> >
>> > <node id="n3">
>> >   <data key="eigenvector_centrality">0.135955</data>
>> >   <data key="id">n3</data>
>> >   <data key="degree">2</data>
>> >   <data key="betweenness_centrality">0</data>
>> > </node>
>> >
>> > Why is it added as a data element?
>> >
>> > -Chris
>> >
>> > _______________________________________________
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>> > http://lists.nongnu.org/mailman/listinfo/igraph-help
>> >
>> >
>>
>>
>>
>> --
>> Gabor Csardi <address@hidden>     UNIL DGM
>>
>>
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-- 
Gabor Csardi <address@hidden>     UNIL DGM