eigs {ConnMatTools}  R Documentation 
This function computes a limited number of eigenvalues and eigenvectors of a
matrix. It uses arpack
function from the
igraph package. If this package is not available, it will use
the standard eigen
function to do the calculation, but will
issue a warning.
eigs( M, nev = min(dim(M)[1]  1, 1), sym = sum(abs(M  t(M)))/sum(abs(M)) < 1e10, which = "LM", use.arpack = TRUE, options.arpack = NULL )
M 
a matrix. 
nev 
number of eigenvalues and eigenvectors to return 
sym 
A boolean indicating if matrix is symmetric or not. Defaults to checking if this is the case or not. 
which 
A character string indicating which eigenvalues to return.
Defaults to "LM", meaning largest magnitude eigenvalues. If not using

use.arpack 
Boolean determining if calculation is to be done with

options.arpack 
Additional options for 
A list with at least the following two items:
values 
A set of eigenvalues 
vectors 
A matrix of eigenvectors 
David M. Kaplan dmkaplan2000@gmail.com
See also arpack