Re: [igraph] question about node attribute

[Tamas Nepusz]

Dear Weijia,

> How to save the info of attributes? how to access the attributes? how to 
> change them?  Can I manipulate the node by node's attribute?
See the following webpage for more information about setting/retrieving 
attributes:
http://www.cs.rhul.ac.uk/home/tamas/development/igraph/tutorial/tutorial.html#setting-and-retrieving-attributes
Attributes are handled by the GraphML and GML formats at the moment; if you 
have only string and numeric attributes, you can safely use these two formats 
to save your graphs. If your attributes contain any other Python objects (e.g., 
user-defined classes), you may pickle the graph using Python's pickle module 
and read it back later.

This section might also be useful, it describes how to select a set of vertices 
or edges based on attributes:
http://www.cs.rhul.ac.uk/home/tamas/development/igraph/tutorial/tutorial.html#querying-vertices-and-edges-based-on-attributes

-- 
Tamas