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https://issues.apache.org/jira/browse/MATH-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13097155#comment-13097155
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Gilles commented on MATH-620:
-----------------------------
Another bug (IMO) in CM:
{code}
Complex infInf = new Complex(Double.POSITIVE_INFINITY,
Double.POSITIVE_INFINITY);
Assert.assertTrue(infInf.multiply(infInf).isInfinite());
{code}
succeeds, but the formula would have produced "NaN" in the real part.
Octave computes:
{noformat}
NaN + Infi
{noformat}
Added unit test (with alternative expectation) in revision 1165296.
> 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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