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Diagonalizing a matrix for special matrix

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mim
mim 2012-10-11
In MATLAB can I find a specific package to diagonal my matrix, I have somehow an specific matrix in which all elements of diagonal are zer0 and there is nonzero( ver small numbers) numbers just when j=i+1 or j=i-1. can I diagonal this matrix in a better way than just writing eig(A)?
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Matt J
Matt J 2012-10-11
编辑：Matt J 2012-10-11
I don't think this structure alone let's you do efficient diagonalization. If it were possible, I think the info would be here
http://en.wikipedia.org/wiki/Tridiagonal_matrix
Is there any other structure - symmetric, Toeplitz, circulant, etc...?
mim
mim 2012-10-11
yes the matrix is symmetric and all none zero elements are positive

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