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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-620) multiplication of infinity
Date Mon, 26 Sep 2011 11:42:26 GMT

    [ https://issues.apache.org/jira/browse/MATH-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13114607#comment-13114607
] 

Gilles commented on MATH-620:
-----------------------------

bq. Math.signum: octave makes a distinction between +0 and -0, from the javadocs Math.signum
does not.

This is actually from the {{Math.signum}} Javadoc:
{panel}
[...]
* If the argument is positive zero or negative zero, then the result is the same as the argument.
{panel}


> 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
>         Attachments: ComplexOctaveTest.java, arne_tests.zip, arne_tests.zip
>
>
> 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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