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https://issues.apache.org/jira/browse/NUMBERS-4?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved NUMBERS-4.
--------------------------
Resolution: Fixed
commit 2b29ed84c9461fba037b8ebfd8a39637c08b6b3e
> Complex.ZERO.pow(2.0) is NaN
> ----------------------------
>
> Key: NUMBERS-4
> URL: https://issues.apache.org/jira/browse/NUMBERS-4
> Project: Commons Numbers
> Issue Type: Bug
> Environment: Linux, Java1.7/Java1.8
> Reporter: Raymond DeCampo
> Priority: Minor
>
> Description copied from MATH-1397 as reported by Mario Wenzel:
> {quote}
> ```
> package complextest;
> import org.apache.commons.math3.complex.Complex;
> public class T \{
> public static void main(String[] args)
> \{ System.out.println(Complex.ZERO.pow(2.0)); }
> }
> ```
> This is the code and the readout is `(NaN, NaN)`. This surely isn't right.
> For one, it should actually be zero
> (https://www.wolframalpha.com/input/?i=(0%2B0i)%5E2) and second of all, the
> documentation doesn't state that anything could go wrong from a Complex
> number that has no NaNs and Infs.
> The other definition states that it doesn't work when the base is Zero, but
> it surely should. This strange corner case destroys any naive implementation
> of stuff wrt the mandelbrot set.
> It would be nice to not have to implement this exception myself.
> {quote}
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