Re: [igraph] RuntimeWarning when reading GraphML

[Chris Wj]

I've looked at a bunch of examples and the GraphML docs/tutorials. I have only seed the form <node id="n0"> to specify the id. 

Also, igraph outputs only: 
...
<node id="n0">
    </node>
    <node id="n1">
    </node>
...
when there are no other attributes specified. It comes out in the attributes list as soon as you add any attribute value.

If it is used like this everywhere, I'd say the <node id="n0"> format should be the primary method of specifying node number. My only other question is will a node ever have a value other than 'n#' as the id, and if so, will it not be read correctly by igraph?

-Chris

On Fri, Feb 6, 2009 at 12:52 PM, Gábor Csárdi <address@hidden> wrote:

So, as I see it, this would be almost exactly the current behavior,
except for renaming 'id' to "GraphML:id" when reading the graph. Oh,
and perhaps using "GraphML:id" as <node id="n3"> ids when writing out
the graph.

G.

On Fri, Feb 6, 2009 at 6:36 PM, Tamas Nepusz <address@hidden> wrote:
>> 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.
>
> I think we should read them anyway, but renaming the auto-generated "id"
> attribute to "GraphML:id" seems a good idea; chances are that some of our
> users will use the "id" attribute for other purposes, but it's unlikely with
> "GraphML:id".
>
>> 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.
>
> I agree; in general, nothing guarantees that the "id" attributes are unique
> and although igraph will happily save the graph as GraphML in this case, it
> won't be able to read it back.
>
> --
> Tamas
>
>
>
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--
Gabor Csardi <address@hidden>     UNIL DGM


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