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

[Tamas Nepusz]

Hi,

Note that you don't need sysadmin permissions to upgrade. You can set  
up a Python virtual environment inside your home directory using  
python-virtualenv, compile and install igraph locally into your home  
directory and then use that. A few tweaks are required, though, the  
whole process is roughly as follows:

1. Get the igraph source code
2. Configure it using ./configure --prefix=/home/marco (or wherever  
your home directory is)
3. make && make install (it will put the necessary files in /home/ 
marco/include and /home/marco/lib)
4. Set up your library path to include /home/marco/lib (otherwise  
Fedora won't find the igraph libs): export LD_LIBRARY_PATH=/home/marco/ 
lib
5. Create a Python virtual environment (see, e.g., http://peak.telecommunity.com/DevCenter/EasyInstall#creating-a-virtual-python 
 )
6. Make sure that "python" points to your virtual environment (i.e.,  
type "which python" in your shell and check the path).
7. Install easy_install into your virtual environment using http://peak.telecommunity.com/dist/ez_setup.py 
 .
8. easy_install python-igraph into your virtual environment

Note that the changes in step #4 should be done whenever you plan to  
use the locally installed igraph (that's in your home directory). Your  
best bet is probably to add it to your .profile or .bashrc.

--
T.


On 2009.06.26., at 11:35, Marco 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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