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Subject: [jira] [Resolved] (MATH-755) On the contract of
 FieldElement<T>.divide(T)
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     [ https://issues.apache.org/jira/browse/MATH-755?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

S=C3=A9bastien Brisard resolved MATH-755.
------------------------------------

    Resolution: Fixed

Actually fixed prior to the release of 3.0.
               =20
> On the contract of FieldElement<T>.divide(T)
> --------------------------------------------
>
>                 Key: MATH-755
>                 URL: https://issues.apache.org/jira/browse/MATH-755
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0, 3.1
>            Reporter: S=C3=A9bastien Brisard
>            Assignee: S=C3=A9bastien Brisard
>            Priority: Minor
>              Labels: exception, field
>             Fix For: 3.1
>
>
> As discussed on the mailing list:
> {quote}
> The contract of {{FieldElement<T>.divide(T)}} states that an {{Arithmetic=
Exception}} should be thrown if the parameter is zero. However, for this bo=
undary case
> * {{BigFraction}} throws {{ZeroException}}
> * {{BigReal}} throws {{ArithmeticException}}
> * {{Complex}} uses NaNs instead of exceptions
> * {{Dfp}}, {{DfpDec}} use flags instead of exceptions
> * {{Fraction}} throws {{MathArithmeticException}}.
> {quote}
> There is a need for some cleaning up, which will proceed in two steps
> # in the {{FieldElement}} interface the statement that an exception must =
be thrown will be removed. The rationale for this is that sometimes, an exc=
eption is actually not wanted. For example, I'm using a wrapper around prim=
itive {{double}}, and I want all boundary cases to be handled _exactly_ the=
 same way as the primitive operation "/").
> # the _same_ exception (if any) will be thrown by all implementations. Th=
is will require to chose between {{ArithmeticException}}, {{MathArithmeticE=
xception}} and {{ZeroException}}.

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