Re: [igraph] labelling vertices using python

[Tamas Nepusz]

Hi,

I checked your code and I think I found the error. When you create  
your graph using igraph.Graph(), the created graph already contains a  
vertex. When you add your vertices by g.add_vertices(...), there will  
be an extra vertex without a label. Its "label" attribute will be  
None, which is not a string -- that's why the call to  
Context.text_extents() fails.

Note that you can supply the number of vertice directly to the  
constructor:

g = igraph.Graph(len(nodeList), directed=False)

--
Tamas


On 2008.07.15., at 15:47, <address@hidden> <address@hidden 
> wrote:

> Hi Tamas, thanks for looking at this. Ive attached the files its about
> 28k. Not sure if the mailing list supports attachments but if it  
> doesn't
> work, could you send me your email address for direct email?
>
> Thanks,
> Venura
>
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden On  
> Behalf
> Of Tamas Nepusz
> Sent: 15 July 2008 14:11
> To: Help for igraph users
> Subject: Re: [igraph] labelling vertices using python
>
> > create with this label. This all seems to be ok and when I plot the
> > graph without labels everything is fine (igraph.plot(g, "g.png",
> > vertex_label=None). However with labels I get the following errors,
> Very strange indeed. Can you please send me an example list from which
> you try to construct the graph? I would need a serialized (pickled)
> variant of your nodeList variable; you can save it in a file called
> pickled_nodelist.dat as follows:
>
> import pickle
> f = open("pickled_nodelist.dat", "w")
> pickle.dump(nodeList, f)
> f.close()
>
> Please send me the generated pickled_nodelist.dat and I'll try to dig
> deeper into this issue.
>
> --
> Tamas
>
>
>
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