I am tracking rotation of an object using quaternions by accumulating each 
successive rotation using quaternion composition.
I notice that probably due to rounding errors, the norm of each successive 
quaternion is drifting from being 1, which means I need to normalize the 
quaternion.
Is there an in-build function that would let me do this? 
Otherwise, I can divide the quaternion by its norm. Is there a method I can 
call on the quaternion to extract its norm?

I looked at the Quaternion documentation page but did not find anything 
there Here is the page I am referring 
to: 
http://doc.sagemath.org/html/en/reference/quat_algebras/sage/algebras/quatalg/quaternion_algebra.html


Thanks
Ben

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