Re: [igraph] how to add disconnected nodes to a graph?

[Tamás Nepusz]

Okay, I made a booboo when I linked Gephi’s page on the GML format. The 
“official” GML specification says that the node IDs can only be integers:  

http://www.fim.uni-passau.de/fileadmin/files/lehrstuhl/brandenburg/projekte/gml/gml-technical-report.pdf

So, the solution is to use numeric IDs in your GML file and put the node names 
in the label attribute (within quotes). The PDF file linked above shows some 
examples.  

--  
T.


On Friday, 6 December 2013 at 17:37, Ahmed Abdeen Hamed wrote:

> Thank you!
>  
>  
> I tried this graph example in GML format:
>  
>  
> graph
> [
> node
> [
> id A
> ]
> node
> [
> id B
> ]
> node
> [
> id C
> ]
> edge
> [
> source B
> target A
> ]
> edge
> [
> source C
> target A
> ]
> ]
>  
>  
>  
>  
> This is how I call my reader :  
> g = igraph.Graph.Read_GML("test.gml")
>  
> Now getting this error:
>  
> python graph-stats.py  
> Assertion failed: (v != 0), function igraph_vector_destroy, file 
> ../../../src/vector.pmt, line 374.
> Abort trap: 6
>  
>  
> Any idea what I am doing wrong?
>  
> -Ahmed
>  
>  
>  
>  
>  
> On Fri, Dec 6, 2013 at 5:06 AM, Tamás Nepusz <address@hidden 
> (mailto:address@hidden)> wrote:
> > > How do you add nodes to a graph without connecting from to others via an 
> > > edge?
> >  
> >  
> > Use a different file format that supports disconnected edges. Pajek 
> > (https://gephi.org/users/supported-graph-formats/pajek-net-format/) or GML 
> > (https://gephi.org/users/supported-graph-formats/gml-format/) are probably 
> > the easiest to create.
> >  
> > T.
> >  
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>  
>  
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