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Re: different eigenvectors

• To: mathgroup at smc.vnet.net
• Subject: [mg83904] Re: different eigenvectors
• From: dh <dh at metrohm.ch>
• Date: Tue, 4 Dec 2007 04:21:42 -0500 (EST)
• References: <fj0rjv$per$1@smc.vnet.net>

Hi Vicky,

imagine what an Eigenvector is and you will understand that if x is an 

EV, so is -x. That explains the different signs. Similar, if c is a 

constant, then  c x is also an EV, the EV is only determined up to a 

constant factor. Further, the order of EV is arbitrary. Mathematica sorts the EV 

  in order of decreasing absolute value of their eigenvalues.

hope this helps, Daniel



vicky Al Aisa wrote:

> hello

> 

> I am using Eigenvectors function to calculate eigenvectors in

> mathematica 5.2.

> while comparing the results with the eigenvectors (of same matrix)

> computed in another system, i found that both the results are bit different

> with some values having opposite sign and coloumns rearranged.

> 

> thank you

> viky al aisa

>