Re: [igraph] igraph 0.5 and Graph.Tree()

[Marco]

Hi Gabor,

what I don't understand is why, with always "directed 1", sometimes
plotting the graph results in directed graphs (with the almighty nice
arrows) and sometimes not, in the same machine.
Might it depend on the fact that when I see the directed graphs all
the nodes have attributes and when I see the undirected ones they have
not?

Also, I noticed that sometimes when I to a to_undirected() on one of
those graphs with attributes, I lose the attributes. Is this ok, or am
I seeing something not ok?

igraph was installed using some rpm found on the net, of the 0.5
version for Fedora 8.

Thank you, as always,

My best,

marco
--
restituiremo il riso ai salici



On Fri, Jun 26, 2009 at 12:44 PM, Gábor Csárdi<address@hidden> wrote:
> Marco, this was not a bug, but I just followed the GML specification that
> said that directed is 1 for undirected graphs.
>
> In the current igraph version this is "corrected", directed is 1 for
> directed graphs. We made this change to be consistent with the many software
> packages that use GML format.
>
> Best,
> Gabor
>
> On Fri, Jun 26, 2009 at 12:35 PM, Marco <address@hidden> wrote:
>>
>> Hello all igraphers!
>>
>> I am using an old version of the library on an old Fedora machine.
>>
>> When I build a tree, using:
>>
>> g=igraph.Graph.Tree(100,3)
>>
>> and then write the graph to a file (GML format) the result is a
>> directed graph: the GML file reads:
>>
>> Creator "igraph version 0.5 Fri Jun 26 12:31:25 2009"
>> Version 1
>> graph
>> [
>>  directed 1
>> ....
>>
>> Which is not obvious, since the Tree() should default to
>> "type=TREE_UNDIRECTED".
>>
>> Is that a glitch in the old version I am using, or it's a bug?
>> And if it is the latter, has it been fixed in more recent versions?
>> Is there a fix without updating?
>>
>> I guess I should update, but I don't know if the admin will let me :)
>>
>> Thanks,
>>
>> marco
>>
>> --
>> restituiremo il riso ai salici
>>
>>
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>
>
>
> --
> Gabor Csardi <address@hidden>     UNIL DGM
>
>
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