[jira] [Commented] (MATH-686) Add methods negate() / reciprocal() to the FieldElement interface

["Sébastien Brisard (Commented JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123371#comment-13123371 ] 

Sébastien Brisard commented on MATH-686:
----------------------------------------

As discussed on the mailing list, retained option was {{negate()}}/{{reciprocal{}}. This method were introduced in rev r1180312.
                
> Add methods negate() / reciprocal() to the FieldElement interface
> -----------------------------------------------------------------
>
>                 Key: MATH-686
>                 URL: https://issues.apache.org/jira/browse/MATH-686
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Sébastien Brisard
>            Priority: Trivial
>             Fix For: 3.0
>
>
> As discussed on the mailing list, it is proposed to add two methods to the {{FieldElement}} interface
> * {{negate()}} : returns the additive inverse of {{this}} element.
> * {{reciprocal()}} : returns the multiplicative inverse of {{this}} element.
> Several name couples have been proposed by Phil
> # {{negate}}, {{invert}}
> # {{opposite}}, {{reciprocal}}
> # {{additiveInverse}}, {{multiplicativeInverse}}
> Looking at the classes implementing this interface in the core CM library, we find that
> * {{Complex}}, {{Dfp}}, {{BigFraction}} and {{Fraction}} already have a {{negate()}} method.
> * Besides, {{BigFraction}} and {{Fraction}} already have a {{reciprocal()}} method.
> So the best naming option would seem to be (for the time being) a mixture of what Phil proposed. I realize it's not completely satisfactory because one is a noun and one a verb. Do we want to have good grammar, or preserve what's already implemented? I tend to favour the first option (consistently change the name of existing methods).

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