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https://issues.apache.org/jira/browse/MATH-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494178
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Richard Lyon commented on MATH-164:
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The behaviour is not consistant with how doubles are handled. For example:
double a, b ,c;
a = 1.0;
b = Double.POSITIVE_INFINITY;
c = a * b;
c always has a value of Infinity. So why should the Complex class handle it
differently? This is addressed in the C99 spec and various associated
discussion papers.
> Complex - Issue with non-compliance to C99!
> -------------------------------------------
>
> Key: MATH-164
> URL: https://issues.apache.org/jira/browse/MATH-164
> Project: Commons Math
> Issue Type: Wish
> Affects Versions: 1.1
> Reporter: Richard Lyon
> Priority: Minor
>
> Complex z1, z2, z3;
>
> // assign values to the two complex numbers
> z1 = new Complex(1.0, 0.0);
> z2 = new Complex(Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY);
>
> // multiply the two complex numbers
> z3 = z1.multiply(z2);
> The result is that both the real and imaginary part of z3 are NaN. Isn't it
> somewhat desirable that both parts of the complex should be Infinity?
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