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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-657) Division by zero
Date Sat, 03 Sep 2011 09:30:09 GMT

    [ https://issues.apache.org/jira/browse/MATH-657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096621#comment-13096621
] 

Gilles commented on MATH-657:
-----------------------------

I've just posted a mail on "dev".

IMO, the main argument is consistency. Also with how reals (i.e. {{double}}) work; IIUC, MATH-164
triggered a change for that same reason.

Arne Plöse is a user and [reported|MATH-620] that the previous behaviour was not fine for
him.

I don't think that this one change can have a discernible performance impact.
It might not be necessary to map all {{Complex}} instances that have an infinite component
to a single object. I pointed it as a convenient justification for fixing a bug (and for not
fixing the other two points reported by Arne in MATH-620).


> Division by zero
> ----------------
>
>                 Key: MATH-657
>                 URL: https://issues.apache.org/jira/browse/MATH-657
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: Gilles
>            Assignee: Gilles
>            Priority: Minor
>             Fix For: 3.0
>
>
> In class {{Complex}}, division by zero always returns NaN. I think that it should return
NaN only when the numerator is also {{ZERO}}, otherwise the result should be {{INF}}. See
[here|http://en.wikipedia.org/wiki/Riemann_sphere#Arithmetic_operations].

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