NiBabel

Access a cacophony of neuro-imaging file formats

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nibabel.quaternions.isunit

Reggie -- the one

nibabel.quaternions.inverse

nibabel.quaternions.inverse(q)

Return multiplicative inverse of quaternion q

Parameters:

q : 4 element sequence

w, i, j, k of quaternion

Returns:

invq : array shape (4,)

w, i, j, k of quaternion inverse