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https://issues.apache.org/jira/browse/MATH-620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082219#comment-13082219
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Arne Plöse commented on MATH-620:
---------------------------------
evaluate this testcase:
{code}
@Test
public void testMultiplyInf() {
Complex z = new Complex(1, neginf);
Complex w = z.multiply(z);
Assert.assertEquals(w.getReal(), neginf, 0);
Assert.assertEquals(w.getImaginary(), neginf, 0);
Assert.assertEquals(w, z.divide(Complex.ONE.divide(z)));
}
{code}
the result should be -inf -infi but actually is inf + infi ...
The division looks also broken...
> 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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