commons-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Richard Lyon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-164) Complex - Issue with non-compliance to C99!
Date Tue, 08 May 2007 03:44:15 GMT

    [ https://issues.apache.org/jira/browse/MATH-164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12494178
] 

Richard Lyon commented on MATH-164:
-----------------------------------

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?

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


---------------------------------------------------------------------
To unsubscribe, e-mail: commons-dev-unsubscribe@jakarta.apache.org
For additional commands, e-mail: commons-dev-help@jakarta.apache.org


Mime
View raw message