Good morning, I was in a Geodesy department for many years and am still doing those kind of things. Geodesists are the well-known masters of least-squares adjustment, but not being a geodesist myself, most of my career is based on the Best Fit lab, notably on the (in)famous adverb:
Nwtn =: adverb def 'y - (u y)%.(u D.1 y)' I guess it's getting time for retirement :-) Greetings from Sydney, Ben On Tue, 27 Aug 2019 at 09:05, Henry Rich <[email protected]> wrote: > J has supported symbolic differentiation and integration for some time. > Starting with Release 9.01, primitive support for calculus is withdrawn. > > The calculus primitives were a proof-of-concept that was an incomplete > success. They worked, but they were not complete, and the nature of > mathematics is such that they will never be complete. It has long been > clear that they should have been implemented in a J script, which would > be much easier to expand & maintain. > > The primitives for Taylor series - t. t: T. - are terminated with > extreme prejudice. > > The primitives for differentiation and integration - d. D. D: - are also > removed, but they are going to a Better Place. A new addon, > math/calculus, is now available. It provides most of the features of > the calculus primitives. Interested users are encouraged to fix & > expand this addon to give support for more methods of integration and > differentiation. > > Henry Rich > > --- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
