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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 08:11:08 GMT

    [ https://issues.apache.org/jira/browse/MATH-863?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13460340#comment-13460340
] 

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

Let's wait for Juliens's tests and adjust the javadoc accordingly.
We may end up having some classes supporting non-commutative fields and other requiring commutative
fields and just state that in the doc, or we may add a CommutativeField marker interface which
would extend Field, or we could add a isCommutative method in the Field interface and check
that were needed. I'm not sure the Java typing mechanism is sufficient, so either simple documentation
or runtime checks may be helpful.

If the test does not work at all and since your other example show it doesn't work either,
then we could simply improve the interface javadoc saying that it only supports commutative
fields.

                
> 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_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
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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