Re: [R] extracting the first few eigenvectors

On 02-05-2014, at 09:17, Mike Miller mbmille...@gmail.com wrote: I have a symmetric matrix, X, and I just want the first K eigenvectors (those associated with the K largest eigenvalues). Clearly, this works: eigs - eigen( X, symmetric=TRUE ) K_eigenvectors - eigs$vectors[ , 1:K ]

Re: [R] extracting the first few eigenvectors

Exactly. The syntax is intended to mimic eigs() in Matlab and Octave. library(rARPACK) eigs(X, 10) # If your X is of class dsyMatrix eigs_sym(X, 10) # If X is of class matrix Best, Yixuan 2014-05-02 4:48 GMT-04:00 Berend Hasselman b...@xs4all.nl: On 02-05-2014, at 09:17, Mike

Re: [R] extracting the first few eigenvectors

Thank you, and thanks for writing that code! That is the perfect answer to my question. I hope the R development team will consider expanding the functionality of eigen() to include the option to retain only the first few eigenvectors and/or eigenvalues. To me it seems very common in