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From Oliver Heger <>
Subject Re: [math] should version 2.0 be targeted to Java 5 ?
Date Sun, 11 May 2008 17:11:43 GMT
Luc Maisonobe wrote:
> Mauro Talevi recently proposed a new package for general linear
> regression ( This patch
> needs Java 5, mainly for annotations.
> Mauro suggested to take the opportunity of the next [math] major version
> to switch to Java 5. A major version seems appropriate for such a
> change, but do we want to do it now ?
> My personal opinion is that sticking to Java 1.3 is really obsolete and
> difficult. When I upgraded my Linux box recently, I had to search old
> backups to reinstall a JDK manually. Dropping this could simplify some
> codes (exceptions for example) and fix some errors (there is a known
> issue with unit tests since Java 1.3 does not compute trigonometric
> functions as it should).
> If we decide to change minimal Java version, I would choose to target
> 1.5. It is widely adopted and deployed now and has many features which
> would be useful for a mathematical library:
>     - new Math functions (log10, cbrt, ulp, signum, cosh, sinh, tanh,
> hypot, expm1, log1p)
>     - autoboxing
>     - MathContext, RoundingMode
> In addition, there are the many features that are interesting for any
> type of Java development (enums, generics, annotations).
> Java 6 brings even more Math functions (copysign, getExponent,
> nextAfter, nextUp, scalb), some of which we needed to add ourselves in
> MathUtils. However, I'm not sure it is as widely deployed than Java5.
> Perhaps Java 7 would bring even more functions (asinh, acosh and atanh
> are still missing ...)
> What do you think ?
> Luc
IMHO the time is right now for Java 1.5. I am not sure about the
adoption of higher versions, so with 1.5 you are probably on the safe side.


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