[R] vertex labels in igraph from adjacency matrix

[Mark W Kimpel]

I am getting some unexpected results from some functions of igraph and 
it is possible that I am misinterpreting the vertex numbers. Eg., the 
max betweenness measure seems to be from a vertex that is not connected 
to a single other vertex. Below if my code snippet:

require(igraph)
my.graph <- graph.adjacency(adjmatrix = my.adj.matrix, mode=c("undirected"))

most.between.vert <- colnames(my.adj.matrix)[which(betweenness(graph = 
my.graph, v=V(my.graph), directed = FALSE) == max(betweenness(graph = 
my.graph, v=V(my.graph), directed = FALSE))) + 1]

sum(my.adj.matrix[most.between.vertext,])
0


Is there a way to automatically set the vertex name attributes from the 
row and colnames of the inputted adjacency matrix to graph.adjacency? 
This would seem like an intuitive feature, but I can't find it 
documented. In the absence of this feature, how can I make sure that I 
am setting the vertex name attributes correctly?
-- 

Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

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