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From Sébastien Brisard (JIRA) <>
Subject [jira] [Commented] (MATH-863) new Quaternion class added in complex package
Date Fri, 21 Sep 2012 07:21:07 GMT


Sébastien Brisard commented on MATH-863:

[...] have Quaternion implement the FiledElement interface

I was about to make the same suggestion! However, on second thoughts, I'm not so sure, because
of the product being non commutative. I am not sure all classes operating on FieldElements
are cautious enough about the product possibly being non-commutative. It might therefore be
dangerous to have {{Quaternion}} implement {{FieldElement}}. However, I agree with Luc: even
if {{Quaternion}} does not implement {{FieldElement}}, similar methods should definitely be
given the same name.

> new Quaternion class added in complex package
> ---------------------------------------------
>                 Key: MATH-863
>                 URL:
>             Project: Commons Math
>          Issue Type: New Feature
>    Affects Versions: 3.1
>            Reporter: Julien Anxionnat
>         Attachments: quaternion.patch, quaternion_v2.patch
>   Original Estimate: 0h
>  Remaining Estimate: 0h
> This patch provides a new class for the mathematical object "Quaternion" in the complex
> This quaternion is considered as a mathematical object (the Hamilton's hypercomplex number).
> Note that it's not a rotation quaternion which has to be a quaternion of norm one. Although
this feature could be used for a getter in the Rotation class.
> This patch provides also some improvements in Precision class : a "double comparison
epsilon" and a method to compute relative comparison.
> (Please, note that's it's my first contribution, and I apologize in advance for my mistakes…)

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