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Date: Tue, 6 Sep 2011 14:07:09 +0000 (UTC)
From: =?utf-8?Q?Arne_Pl=C3=B6se_=28JIRA=29?= <jira@apache.org>
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Subject: [jira] [Updated] (MATH-620) multiplication of infinity
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     [ https://issues.apache.org/jira/browse/MATH-620?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:all-tabpanel ]

Arne Pl=C3=B6se updated MATH-620:
----------------------------

    Attachment: ComplexOctaveTest.java

Here is the comparision between commons math and octave.
I hope this what you want Gilles ;-).

> multiplication of infinity
> --------------------------
>
>                 Key: MATH-620
>                 URL: https://issues.apache.org/jira/browse/MATH-620
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>            Reporter: Arne Pl=C3=B6se
>            Priority: Minor
>         Attachments: ComplexOctaveTest.java
>
>
> Take the following testcase=20
> {code}
> Assert.assertEquals(neginf, inf* neginf, Double.MIN_VALUE);  // <--Passes=
 ordinary double
> Assert.assertEquals(new Complex(neginf, 0), new Complex(inf, 0).multiply(=
new Complex(neginf, 0)));// <-- Fail only real parts no imaginary parts=20
> {code}
> The outcome of multiply is Complex.INF if one part is infinity.
> why not simply compute the multiplication and thats is?

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