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https://issues.apache.org/jira/browse/MATH-686?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sébastien Brisard closed MATH-686.
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Fixed in 3.0.
> 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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