Ubuntu first configuration - Price Network example

Hello,
I'm really really new to Ubuntu and Python, so be gentle with me, and
moreover don't give anything for granted with me, thank you!
I installed graph tool via 'sudo apt-get install graph-tool', and everything
seemed to go fine.
I'm now trying to run the example code from the documentation (Price Network
example), but I cannot make it work  
These are the steps I followed:
1 - sudo gedit first.py
2 - copy and paste of example code
3 - save (so it gets in my home)
4 - python first.py
Here I get the following error:
/Traceback (most recent call last):
File "first.py", line 10, in <module>
from graph_tool.all import *
ImportError: No module named graph_tool.all/

I tried the following:
1: reissue the installing command, but it says that graph-tool is already
installed with last version
2: if I write 'graph-tool --help' it says command not found
3: gcc -v says

/Target: i686-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
4.6.1-9ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++,go --prefix=/usr
--program-suffix=-4.6 --enable-shared --enable-linker-build-id
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext

Re: Ubuntu first configuration - Price Network example

Hi Fabio,

On 02/11/2012 10:35 PM, Fabio wrote:
> These are the steps I followed:
> 1 - sudo gedit first.py

You do not need to run "sudo", since there is no need to edit the
program as the superuser.

> 2 - copy and paste of example code
> 3 - save (so it gets in my home)
> 4 - python first.py
> Here I get the following error:
> /Traceback (most recent call last):
> File "first.py", line 10, in <module>
> from graph_tool.all import *
> ImportError: No module named graph_tool.all/

Is the trailing slash "/" really in the error message?

Try the following to see if graph-tool was properly installed: 1. Type
"python"; 2. inside the python prompt, type "import graph_tool". If not
error is given, then graph-tool was properly installed.

> 6: If I look for python on the computer, I see there is both python2.6
> and python2.7 and python3 under usr/lib

Try the same command as before, but with "python2.6" instead of "python".

Cheers,

Re: Ubuntu first configuration - Price Network example

Hi Tiago,
thank you very much for the very quick reply!

Tiago Peixoto wrote
> 
>> 4 - python first.py
>> Here I get the following error:
>> /Traceback (most recent call last):
>> File "first.py", line 10, in <module>
>> from graph_tool.all import *
>> ImportError: No module named graph_tool.all/
> 
> Is the trailing slash "/" really in the error message?
> 

No, I'm sorry, it's just a typo... no slash :D

Tiago Peixoto wrote
> 
> Try the following to see if graph-tool was properly installed: 1. Type
> "python"; 2. inside the python prompt, type "import graph_tool". If not
> error is given, then graph-tool was properly installed.
> 

It says:
/Python 2.7.2+ (default, Oct 4 2011, 20:03:08)
[GCC 4.6.1] on linux2/
etc etc... and at import graph_tool it says
/Traceback (most recent call last):
File "<stdin>", line 1, in <module>

Re: Ubuntu first configuration - Price Network example

On 02/12/2012 08:41 PM, Fabio wrote:
>>> 6: If I look for python on the computer, I see there is both python2.6
>>> and python2.7 and python3 under usr/lib
>>
>> Try the same command as before, but with "python2.6" instead of "python".
>>
>
> It says:
> /Python 2.6.7 (r267:88850, Aug 11 2011, 12:16:10)
> [GCC 4.6.1] on linux2/
> etc etc... and at import graph_tool it seems to work, meaning that no error
> appears, and the prompt is ready for another command!
> 
> So I tried the following command:
> python2.6 first.py
> and it worked! It created the PDF graph, as expected!
> 
> So, the error is that graph_tool is installed in a python version that is
> not the default one, is that right?
> Which version should graph_tool be installed on? 2.6 or 2.7?

It seems graph-tool is installed against python 2.6 on ubuntu, so you
have to use that version. In the next version I will make sure it is
installed against the latest version.

Cheers,
Tiago

--

-- 
Tiago de Paula Peixoto <tiago <at> skewed.de>

Configure error python development version needed??

I'm running centos 6.0

Using python 2.7 and boost 1.44 installed numpy scipy, expat and other
dependencies

when I run configure

./configure --prefix=/opt LDFLAGS=-L/opt/lib CPPFLAGS=-I/opt/include
CXXFLAGS=-I/opt/include 

I am producing an error: (I have Python.h installed since I compiled
python2.7 from source)

checking consistency of all components of python development environment...
no
configure: error:
  Could not link test program to Python. Maybe the main Python library has
been
  installed in some non-standard library path. If so, pass it to configure,
  via the LDFLAGS environment variable.
  Example: ./configure LDFLAGS="-L/usr/non-standard-path/python/lib"

============================================================================
   ERROR!
   You probably have to install the development version of the Python
package
   for your distribution.  The exact name of this package varies among them.

============================================================================

ImportError: No module named graph_tool.all

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Re: ImportError: No module named graph_tool.all

SOLVED:

I added this to .bashrc

export PYTHONPATH=/usr/local/lib/python2.7/site-packages/

(previosuly I added 
export PYTHON_VERSION=2.7

to compile successfully.
)

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Re: ImportError: No module named graph_tool.all

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paths output from search algorithms?

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Re: paths output from search algorithms?

On 03/02/2012 09:02 AM, Matthias Ekman wrote:
> Hi,
>
> is there a way to get the actual paths itself - instead of the
> distance - from the search algorithms like e.g. dijkstra_search?

You can use the shortest_path() function.

    http://projects.skewed.de/graph-tool/doc/topology.html#graph_tool.topology.shortest_path

Otherwise you can write your own search visitor which records the path
for you.

> As a related question, in a weighted adjacency matrix, how are the
> weights interpreted for dijkstra and centrality functions (pagerank,
> betweenness centrality) that rely on it. Is it low weight = easier to
> "travel", or is it the other way around?

The weights are always _minimized_, unless otherwise stated. Note that
in Pagerank the weights are used differently, since there is no shortest
path computation in this case (see its documentation for more details).

Cheers,
Tiago

--

-- 
Tiago de Paula Peixoto <tiago <at> skewed.de>

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