Can I find nonnegative eigenvalues using eigs

mim
2014 1 13
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更新时间：2014 1 13
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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

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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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mim
mim 2014-1-13
Thanks for your answer, but it is obvious that I can obtain all then choose non negative, but I want to do it in only one step. The matrix is real symmetric
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?
mim
mim 2014-1-13
just because I want to do it faster

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2014-1-13

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