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Can I find nonnegative eigenvalues using eigs

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mim
mim 2014-1-13
评论： mim 2014-1-13
In a very large sparse matrix I want to use eigs function to find all non-negative eigenvalues and corresponding eigenvectors, is it possible?

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Paul
Paul 2014-1-13
Yes it is. At least if its a symmetric matrix. Else you can only get n-2 eigenvalues, where (n,n) is the size of the matrix. Just output all the eigenvalues and then get the non-negative ones.
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Paul
Paul 2014-1-13
So I guess you're asking if there is an option to set to get only non-negative eigenvalues, which there isn't. Why isn't doing it in more steps not good enough if I may ask?

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