I had noticed that the inverse of factorial used D. With the latest release:
! inv 3 |domain error | !inv 3 On Tue, Sep 3, 2019 at 2:48 AM Ben Gorte <[email protected]> wrote: > Hi, > > I'm trying to modify my code that uses D. 1 by replacing it with Ddot 1, > after: > Ddot =: pderiv_jcalculus_ > > Is that roughly the way to go? > > JVERSION tells me: > > Engine: j901/j64avx/linux > > Beta-i: commercial/2019-08-29T09:32:08 > > Library: 9.01.09 > > Qt IDE: 1.8.1/5.5.1 > > Platform: Linux 64 > > Installer: J901 install > > InstallPath: /home/ben/j901 > > Contact: www.jsoftware.com > > > I notice that D. is still around, but I'm running into lots of issues with > Ddot. > > Is this the version I should use for this? > > > Thanks, > > Ben > > > On Tue, 27 Aug 2019 at 11:16, bill lam <[email protected]> wrote: > > > Addons and labs need to change to use cover adverb and I think it will > work > > even better than before because D. can be enhanced much easier if it is > > implemented in J scripts. > > > > > > > > On Tue, Aug 27, 2019, 9:08 AM Ben Gorte <[email protected]> wrote: > > > > > 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 withdrawn.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 > > > > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
