[R] matlab eigs function in R
dwinsemius at comcast.net
Tue Jun 3 16:04:12 CEST 2008
"Jorge Ivan Velez" <jorgeivanvelez at gmail.com> wrote in
news:317737de0806030529t50fdced9r49156de606a0d198 at mail.gmail.com:
> Dear kayteck,
> Function eigen (see ?eigen) will do what you want.
He had looked, but since eigen returns both eigenvalues and
eigenvectors, and does so in a list, perhaps he needs advice about how
to extract his values from the list structure.
x <- matrix(c(1:5, (1:5)^2, (1:5)^(1/2), 0,0,0,1,0, 0,0,0,0,1),5, 5)
#List of 2
# $ values : cplx [1:5] 7.43+0i 1.00+0i 1.00+0i ...
# $ vectors: cplx [1:5, 1:5] 0.0699+0i 0.1600+0i 0.2894+0i ...
d <- 3
 7.431675+0i 1.000000+0i 1.000000+0i
#no need to sort since eigen does that by default.
Not sure we can help him out regarding the "slight difference" btwn
Matlab values and R values due to the unnecessary vagueness of his
> On Tue, Jun 3, 2008 at 5:42 AM, kayteck_master
> <kayteck_master at o2.pl> wrote:
>> Does anybody know how one can compute d largest
>> eigenvalues/eigenvectors in R, like in MATLAB eigs function ? eigen
>> function computes all eigenvectors/eigenvalues, and they are
>> slightly different than those generated by matlab eigs.
>> Thanks in advance
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