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...m 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.