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Calculates the result based on coefficients previously-calculated in sp_convergence().
The eigenvalue is strictly only calculated in sp_convergence().
References syten::abs(), std::begin(), syten::conj(), std::end(), memoizedCoeffs, syten::Krylov::norm(), syten::Krylov::overlap(), std::vector< T >::size(), SYTEN_ASSERT_MSG, and SYTEN_SMALL_THRESHOLD.