Function _quat_real

mne/transforms.py:1423–1434

Get the real part of our 3-element quat.

(quat)

def _quat_real(quat):
    """Get the real part of our 3-element quat."""
    assert quat.shape[-1] == 3, quat.shape[-1]
    return np.sqrt(
        np.maximum(
            1.0
            - quat[..., 0] * quat[..., 0]
            - quat[..., 1] * quat[..., 1]
            - quat[..., 2] * quat[..., 2],
            0.0,
        )
    )


def _quat_mult(one, two):