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Extracting the dominant eigenvector


From: Stefan Jonsson
Subject: Extracting the dominant eigenvector
Date: Thu, 28 Mar 2002 00:37:40 +0000

 
 
Hello octave users
 
I have what I hope is a simple problem
 
I have a square matrix, A, currently 10by10, may at later time have different dimensions.
 
asking for eigenvalues and eigen vectors
 
[vect, val] =eig(A); 
 
I need the dominant eigenvalue and corresponding eigenvector
 
When the matrix was 3by3 I did the following, which I find tedious
 
 
 
if (max(max(val)) == val(1,1))
V = vect(1:3,1);
elseif  (max(max(val)) == val(2,2));
V = vect(1:3,2);
else
V = vect(1:3,3);
endif 
 
the dominant eigen value was similarily extracted by
ld=max(max(val))
 
My question is, as you may have guessed by now, is there any simpler way to get a eigenvector that mathces the dominant eigenvalue?  I am thinking to somehow getting the postion where the dominant eigenvalue is and locate the eigenvector based on the position.
 
In my application the dominant eigenvalue is allways positive.
 
Thanks,
Stefan
 
 


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