openbraininstitute / neurodamus / 27957563949

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Fix complex dtype crash in contour2centroid with NumPy 2.5.0+ (#558)

Replace `eig` with `eigh` (the solver for symmetric/Hermitian matrices). Since `points.T @ points` is always real-symmetric, `eigh` is both mathematically correct and guarantees real-valued output.

opt: leverage eigh to pick biggest and smallest eigenvalues since eigh returns them in order.

Fix: https://github.com/openbraininstitute/neurodamus/issues/559

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