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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 13:41:08 GMT


Sébastien Brisard commented on MATH-863:

If you like {{leftMultiply}}, feel free to add it, so long as {{a.multiply(b)}} reads from
left to right... How about we call {{leftMultiply}} {{weirdMultiply}} ;)

In fact, thinking about it, there might be a gain in implementing {{leftMultiply}}: if we
were to create a {{Real}} class which would be a subclass of {{Quaternion}}, Real.leftMultiply(Quaternion)
would be much faster than Quaternion.rightMultiply(Real).
> 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_adjustments.patch, 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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