rt numpy as np
    >>> from scipy import linalg
    >>> a = np.array([[0., -1.], [1., 0.]])
    >>> linalg.eigvals(a)
    array([0.+1.j, 0.-1.j])

    >>> b = np.array([[0., 1.], [1., 1.]])
    >>> linalg.eigvals(a, b)
    array([ 1.+0.j, -1.+0.j])

    >>> a = np.array([[3., 0., 0.], [0., 8., 0.], [0., 0., 7.]])
    >>> linalg.eigvals(a, homogeneous_eigvals=True)
    array([[3.+0.j, 8.+0.j, 7.+0.j],
           [1.+0.j, 1.+0.j, 1.+0.j]])

    >>> a = np.array([[0., -1.], [1., 0.]])
    >>> linalg.eigvals(a) == linalg.eig(a)[0]
    array([ True,  True])
    >>> linalg.eig(a, left=True, right=False)[1] # normalized left eigenvector
    array([[-0.70710678+0.j        , -0.70710678-0.j        ],
           [-0.        +0.70710678j, -0.        -0.70710678j]])
    >>> linalg.eig(a, left=False, right=True)[1] # normalized right eigenvector
    array([[0.70710678+0.j        , 0.70710678-0.j        ],
           [0.        -0.70710678j, 0.        +0.70710678j]])



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