[R] Beginning Eigen System question.

[Joris Meys]

Which other Linear Algebra system, and which function did you use in R?
Cheers
Joris

On Thu, Jun 24, 2010 at 12:32 AM,  <rkevinburton at charter.net> wrote:
> Forgive me if I missunderstand a basic Eigensystem but when I present the following matrix to most any other LinearAlgebra system:
>
>  1  3  1
>  1  2  2
>  1  1  3
>
> I get an answer like:
>
> //$values
> //[1]  5.000000e+00  1.000000e+00 -5.536207e-16
>
> //$vectors
> //           [,1]       [,2]       [,3]
> //[1,] 0.5773503 -0.8451543 -0.9428090
> //[2,] 0.5773503 -0.1690309  0.2357023
> //[3,] 0.5773503  0.5070926  0.2357023
>
> But R gives me:
>
> //$values
> //[1]  5.000000e+00  1.000000e+00 -5.536207e-16
>
> //$vectors
> //           [,1]       [,2]       [,3]
> //[1,] -0.5773503 -0.8451543 -0.9428090
> //[2,] -0.5773503 -0.1690309  0.2357023
> //[3,] -0.5773503  0.5070926  0.2357023
>
> The only difference seems to be the sign on the first eigen vector. What am I missing?
>
> Kevin
>
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-- 
Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

tel : +32 9 264 59 87
Joris.Meys at Ugent.be
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