eigenvalues - determining the three major eigenvalues from a matrix

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Bran
Bran 2013-7-10
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?

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Muthu Annamalai
Muthu Annamalai 2013-7-10
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

更多回答（2 个）

Jan
Jan 2013-7-10
Is your matrix large and sparse, then use eigs. Otherwise eig is sufficient. Both are builtin functions.
Bran
Bran 2013-7-10
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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