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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-863) new Quaternion class added in complex package
Date Fri, 21 Sep 2012 07:13:07 GMT

    [ https://issues.apache.org/jira/browse/MATH-863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460304#comment-13460304
] 

Luc Maisonobe commented on MATH-863:
------------------------------------

Wouldn't it be better to stick with multiply as the method name and have Quaternion implement
the FiledElement interface?

In this case, a (very simple) QuaternionField companion class should be needed. This would
allow using Quaternion instances as elements to some of the linear algebra methods (like LU
decomposition and solver).

As Julien mentioned he wanted to have the pure mathematical object, it makes sense to complete
the job.
                
> new Quaternion class added in complex package
> ---------------------------------------------
>
>                 Key: MATH-863
>                 URL: https://issues.apache.org/jira/browse/MATH-863
>             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
package.
> 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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