I'm looking for a code in Matlab or any other program which can calculate all possible eigenvalues for a block Tridiagonal matrix of size 1000 or more, I have tried a routine in Matlab with eigs but it seems to me there are many hidden eigenvalues that are not calculated.. appreciate any help:)
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eig(A)command "returns a column vector containing the eigenvalues of square matrix" – Thales Aug 06 '19 at 19:37