Hi all, I would like to go back to some discussions we had a while ago: adding some operations on FieldElement. There was one discussion on the dev list one year ago (see <http://commons.markmail.org/thread/lokbafadi2uwin2n>) and a JIRA issue two years ago (see <https://issues.apache.org/jira/browse/MATH-569>).
Since that time, we have added at least one new Field/FieldElement implementation: DerivativeStructure. This one has the same domain of definition as Dfp, i.e. it mimics real numbers only. It already does implement all operations, including sqrt (returning NaNs when applied to negative numbers for example). I already needs this kind of objects for 3D vectors and rotations. You may have noticed I implemented them specifically for DerivativeStructure, but I think it would make more sense to implemenbt it as Vector3D<T extend ExtendedField> so we could have both an implementation using DerivativeStructure and an implementation using Dfp. In fact, I think we could later on even add the missing methods to the Complex class so it could also implement this interface, which would be closer to the other needs that appeared at least twice on the project. At the time the issues were raised, it seems we decided to not implement this because of lack of time and lack of complete use cases among Complex. Now we have at least another use case (geometry needs for me), and most of the work is already available (implementation of these geometry needs for DerivativeStructure only, with a full test suite with 100% line coverage). So It may be worth extracting the interface from DerivativeStructure. After that, adding the methods to the other Field classes could be done progressively (Dfp would be the first one to follow, and would be quite simple as almost everything is already available in the companion class DfpMath). What do you think? Luc --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
