eigenvalues - determining the three major eigenvalues from a matrix

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Bran
Bran on 10 Jul 2013
Is there a code or program I can download which will determine the three main eigenvalues,; t1 t2 and t3 of a matrix as I really am not sure how to go about this?

Accepted Answer

Muthu Annamalai
Muthu Annamalai on 10 Jul 2013
Take a look at the >> doc eigs >> doc eig as @Jan Simon has suggested.
For example with eigs
So if A is your matrix and you want the first 3 eigenvalue-vector pairs, you just use,
>> [v,d] = eigs(A,3)
>> d = diag(d)
should solve your problem explicitly

More Answers (2)

Jan
Jan on 10 Jul 2013
Is your matrix large and sparse, then use eigs. Otherwise eig is sufficient. Both are builtin functions.

Bran
Bran on 10 Jul 2013
Well I actually would like to work out the principal Eigen vector for a ODF which is in the form of a vector but I'm not really sure how to go about that. would something like princomp be suitable?

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