[jira] [Commented] (MATH-620) multiplication of infinity

["Arne Plöse (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13065132#comment-13065132 ] 

Arne Plöse commented on MATH-620:
---------------------------------

This goes also wrong:
{code}
        Assert.assertEquals(new Complex(neginf, nan), new Complex(0,
inf).multiply(new Complex(0, inf)));// <-- Fail
{code}
the result is the output of octave - so I would expect the same.


Am Donnerstag, den 14.07.2011, 08:58 +0000 schrieb Arne Plöse (JIRA): 




> 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 Plöse
>            Priority: Minor
>
> Take the following testcase 
> {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 
> {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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