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Posted to dev@commons.apache.org by bu...@apache.org on 2005/11/23 19:02:15 UTC
DO NOT REPLY [Bug 37086] -
[math] Complex arithmetic operations do not conform to C99x Annex G
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http://issues.apache.org/bugzilla/show_bug.cgi?id=37086
phil@steitz.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |WONTFIX
------- Additional Comments From phil@steitz.com 2005-11-23 19:02 -------
Current behavior has been documented. No attempt has been made to implement
C99x Annex G for the following reasons:
1. Spec is not publicly available and we have not been able to get
permission to quote from the spec in javadoc or to share the spec
with the development community.
2. Spec is for the C language and Annex G is still not normative.
3. Following the spec complicates and has performance impacts on
implementations.
4. Following the spec introduces semantic incompatibility with
version 1.0 of commons-math.
The user guide and javadoc have been updated to reflect the following principles:
* Operations invoked on arguments having any NaN parts always result in
Complex.NaN returned;
* Infinite values are handled according to the rules for java.lang.Double
arithmetic, resulting in NaN or infinities returned in parts of Complex
results per the computational formulas provided in the method javadoc.
So...for now closing as WONTFIX.
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