How to compute in R eigenvalues and respective multiplicities of an adjacency matrix?

Question

I have a symmetric adjacency matrix with binary values (0, 1) in R. Let's say:

library(igraph)
g <- erdos.renyi.game(10, 10, type="gnm", directed = FALSE, loops = TRUE)
m <- get.adjacency(g)

I need to do spectrum analysis of this graph, by producing a list of sublists of eigenvalues with their respective multiplicities. I am aware of functions like eigen(m). This previous question used it, but did not explain any automatic way for counting multiplicities:

number of distinct eigenvectors in R

Currently, I am using igraph package. – Duca d'Auge Oct 28 '15 at 10:13 — Duca d'Auge, Oct 28 '15 at 10:13

score 0 · Accepted Answer · answered Oct 28 '15 at 15:58

0

If the multiplicity of an eigenvalue is n, it appears n times in eigen(m)$values.

answered Oct 28 '15 at 15:58

mra68

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How to compute in R eigenvalues and respective multiplicities of an adjacency matrix?

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