Eigen returns at least Math::GSL::Eigen, which has functions for eigenvalues of both symmetric and nonsymmetric matrices. I'm not sure where you've looked or why GSL was inappropriate. PDL::MatrixOps also discusses an eigens function which computes the eigenvalues and vectors using PDL (I guess).

In reply to Re: Egenvalues/Eigenvectors for Non-Symmetric Arrays? by Corion
in thread Egenvalues/Eigenvectors for Non-Symmetric Arrays? by ack

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