[R--gR] R data structure for network graphs?

I wonder:  has this group defined an R data structure for
representing network graphs, with nodes and edges (and
perhaps with node and edge attributes as well)?  I wish
to include this view of our data along side our experimental
data.

Dear Paul

I think that the only structure available in R for graphs
is class graph defined in package graph by 
Robert Gentleman.  It is a Bioconductor package. 
Look at http://www.bioconductor.org/

Package: graph

 

 Description: A package that implements some simple graph handling 
capabilities.
 Version: 1.1.9
 Author: R. Gentleman, Elizabeth Whalen
 Maintainer: R. Gentleman 
 Dependencies: R (>= 1.7), cluster, XML
 SystemRequirements: NA
 License: LGPL

Giovanni

< Giovanni M. Marchetti >
Dipartimento di Statistica, Univ. di Firenze   Phone:  +39 055 4237 204
viale Morgagni, 59                             Fax:    +39 055 4223 560
I 50134 Firenze, Italy                         email:  gmm at ds.unifi.it