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