# $Author: saulius $
# $Revision: 9750 $
# $Date: 2022-02-08 06:24:00 +0000 (Tue, 08 Feb 2022) $

Check a quaternion
==================

Check the properties of a quaternion and specify in the output whether
it is (within a give precision):

- a unit quaternion (a versor);

- a vector (purely imaginary) quaternion;

- a real quaternion.