Zembower, Kevin wrote: > Robert and Gabor, thanks so much for writing and helping me. Both > suggestions will be very helpful. > > Robert, with regard to RBGL, I didn't consider this because I'm not very > knowledgeable about projects in the Bioconductor system. In fact, my > only interest was caused by Googling 'krackhardt' and discovering his > data in the SNAData package. I've never heard of RBGL, but Googling it > just now returns a page with "Description: demo of interface with full > copy of all hpp defining boost." From this description, I don't think > that I would have known that this has anything to do with Social Network > Analysis. I've printed the manual for RBGL and will investigate it for > my use. Thanks for suggesting this. Very good point, I had not noticed that the DESCRIPTION file had not changed since we began - hopefully it is now somewhat more descriptive. You should be able to virtually everything in Wasserman and Faust from RBGL - I would be happy to hear about things that do not work, or where the implementation is not obvious. best wishes Robert > > I also didn't know that 'as' was an alias for 'coerce.' Thank you so > much for pointing this out, and for your example. All of this is really > helpful. > > -Kevin > > -----Original Message----- > From: Robert Gentleman [mailto:rgentlem at fhcrc.org] > Sent: Thursday, April 24, 2008 9:29 AM > To: Zembower, Kevin > Cc: bioconductor at stat.math.ethz.ch > Subject: Re: [BioC] Example of converting graphNEL object to ajacency > matrix? > > Hi, > > Zembower, Kevin wrote: >> I'm interested in converting the graphNEL objects in the package > SNAData >> into adjacency matrices, so that I can convert them into 'network' >> objects and use the R package 'sna' to analyze them. I'm working > through >> the examples in Wasserman and Faust, Social Network Analysis, and > these >> datasets will save me considerable typing. > > Why not just analyze them with the tools in RBGL (which are a bit > more extensive than those in sna)? > >> I think that this is possible because of references to the 'coerce' >> method on the graphNEL-class and graphAM-class help pages, but I > haven't >> been successful. I've tried commands like: >> coerce(friendship, fs-mat) >> coerce(friendship, fsmat) >> as.matrix(friendship) >> as.graphAM(friendship) >> coerce(from="friendship", to="fsmat") > > I am a bit confused about how you got to any of these incantations. > The man page for coerce (as) is pretty explicit about needing to specify > > the input, and the name of the desired class, so my first guess would > have been: > > as(friendship, "matrix") > > which does indeed seem to work. > > Robert > >> Can anyone give me an example of converting a graphNEL object to a >> regular matrix, such as an adjacency matrix? I think with just one >> example, I could work things out. >> >> Thanks for your advice and suggestions. >> >> -Kevin >> >> Kevin Zembower >> Internet Services Group manager >> Center for Communication Programs >> Bloomberg School of Public Health >> Johns Hopkins University >> 111 Market Place, Suite 310 >> Baltimore, Maryland 21202 >> 410-659-6139 >> >> _______________________________________________ >> Bioconductor mailing list >> Bioconductor at stat.math.ethz.ch >> https://stat.ethz.ch/mailman/listinfo/bioconductor >> Search the archives: > http://news.gmane.org/gmane.science.biology.informatics.conductor > -- Robert Gentleman, PhD Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M2-B876 PO Box 19024 Seattle, Washington 98109-1024 206-667-7700 rgentlem at fhcrc.org