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Thread Subject:
Eig fun.

Subject: Eig fun.

From: huda nawaf

Date: 23 Dec, 2008 16:48:03

Message: 1 of 3

hi,
there is some ambiguity in eig function .
I would like to know : how have been extracted the eigen vector and eigen values?
i appreciate any response.
thanks in advance

Subject: Eig fun.

From: Matt

Date: 23 Dec, 2008 18:12:02

Message: 2 of 3

"huda nawaf" <halmamory@yahoo.com> wrote in message <gir4o3$f2o$1@fred.mathworks.com>...
> hi,
> there is some ambiguity in eig function .
> I would like to know : how have been extracted the eigen vector and eigen values?
> i appreciate any response.
> thanks in advance

See "doc eig"

From there, you will be linked to the LAPACK online documentation...

Subject: Eig fun.

From: Roger Stafford

Date: 23 Dec, 2008 18:46:02

Message: 3 of 3

"huda nawaf" <halmamory@yahoo.com> wrote in message <gir4o3$f2o$1@fred.mathworks.com>...
>.....
> there is some ambiguity in eig function .
> ......
  The eigenvectors and eigenvalues of a square matrix come as a set of matched pairs. There can be an ambiguity as to the order in which they are given as long as the pairing is preserved. Also when some eigenvalues are equal there can be an ambiguity as to how the corresponding eigenector space is spanned with eigenvectors. I know of no other ambiguities. These ambiguities are inherent in the very definition of eigenvectors and eigenvalues. What ambiguities do you have in mind?

Roger Stafford

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