linear algebra - Eigenvalues of large symmetric matrices -


when try compute eigenvalues of adjacency matrix of a large graph get, can charitably described as, garbage. in particular, since graph four-regular, eigenvalues should in $[-4, 4]$ visibly not. used matlab (via matlink), , got same problems, issue transcends mathematica. question is: best way deal it? sure matlab , mathematica use venerable eispak code, there may newer/better


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