Re: [igraph] MAtlab/igraph conflict?

[Tamas Nepusz]

Dear Alessandro,

Matlab is using its own copy of the C runtime library and its version  
number is different from the C runtime you used when compiling igraph.  
When you try system('python script.py'), it tries to link to Matlab's  
C runtime with the igraph module and of course it won't succeed.  
Judging from the fact that it works with 'sudo python script.py', I  
guess that Matlab modifies the library search path using some  
environment variable and this variable is cleared in the subshell  
launched by sudo. So, I'd suggest you to try the following:

system('/usr/bin/env python script.py')

env clears the environment variables just like sudo, but it won't  
switch to the superuser account. I hope it helps.

--
Tamas

On 2009.02.23., at 13:02, Alessandro Antonucci wrote:

> Dear Igraphers,
>
> I'm running a Python script based on (Python)igraph
> in a linux environment. This script should interact with
> Matlab, but, if I try to run the script from Matlab, by a
> (Matlab) command like:
>
> system('python script.py')
>
> I receive the following error:
>
> ____________________________
>
> File "/home/alessandro/Lab/
> ImpreciseGraphicalProbabilisticModels/__init__.py", line 1, in  
> <module>
> from igraph import *
> File "build/lib.linux-i686-2.5/igraph/__init__.py", line 30, in  
> <module>
> ImportError: /opt/matlab/sys/os/glnx86/libstdc++.so.6: version  
> `GLIBCXX_3.4.9' not found (required by /usr/lib/libigraph.so.0)
> ____________________________
>
> I've also noticed that if I run the script as a superuser, which means
> if I run Matlab as a normal user, but I run the command:
>
> system('sudo python script.py')
>
> everything works fine.
>
> Any idea about what is going wrong?
>
> Best,
>
> Alessandro
> _______________________________________________
> igraph-help mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/igraph-help