I have updated the release plan http://wiki.apache.org/jakarta-commons/math/1%2e1ReleasePlan with some notes on basic complex arithmetic operations, comparing current (1.0) behavior with Colt and R and making a recommendation for 1.1 in each case.
In some cases, the 1.1 recommendation differs from what would be prescribed by the C99x Annex G standard. That is because the recommended behaviour would be relatively easy to document without quoting from the C99x spec, which is a little complicated. I have made inquiries to ISO / ANSI on whether we can quote from the spec in our javadoc and on this list. Until I get affirmative response, and maybe even if I do, I think it is best to use the following "naive" computing principle: * Apply definitional formulas and return NaN in real or imaginary parts when the normal java.lang.double arithmetic rules yield NaN values. Similarly for positive and negative infinity. Unfortunately, * is a little tricky and in some places inefficient to implement since the best computational formulas are not the same as the definitional ones, so care has to be taken to ensure that NaNs and INFs are correctly returned. Input / patches welcome! Feel free to add comments to the Wiki. I will summarize here and on the ticket once people have had a chance to weigh in and I have heard back from ANSI/ISO on the spec issue. Phil --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
