Hi, you can iterate over the vertices, but it'll be probably slow. The best solution is to create the graph directly from the data frame(s) containing all structure and attribute data. See the graph.data.frame() function for this.
Btw. it might be worth to post your igraph related questions to the igraph-help mailing list if you don't get an answer here, (sadly) I am not reading R-help frequently any more. See http://igraph.sf.net. Best, Gabor On Mon, Apr 23, 2012 at 6:26 AM, cwdillon <cwdil...@gmail.com> wrote: > Hi, > So I've been figuring out how to use igraph in R and like it for it's speed > and simplicity. Now I have a graph built from an edgelist where vectors have > a $name attribute. I have another dataframe with attributes tied to a > vector ID, which is the same as the $name attribute of vectors represented > in the graph. > > How can I iterate over the graph by V(g)$name and do set.vector.attributes > for the other attributes in the vector dataframe? Of course, the edgelist > for the graph contains each vector zero or many times and they are not > sorted in the same order as the vector dataframe. It's a large bit of data: > about 20m edges and 3m vectors. I can't do this by hand. > > Perhaps the answer is something like, > by V(g)[]$name in g { > i=get.index(V(g)$name) > if (V(g)[1]$name == dataframe$ID) { > V(g)[1]$newattribute1 <- dataframe$attribute1 > V(g)[1]$newattribute2 <- dataframe$attribute2 > V(g)[1]$newattribute3 <- dataframe$attribute3 > } > } > > R, > CW Dillon > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Add-attributes-to-igraph-vector-by-name-not-index-tp4580032p4580032.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. -- Gabor Csardi <csa...@rmki.kfki.hu> MTA KFKI RMKI ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
