Yes, that's the way to go. Report your problems to beta, or fix up the
addon.
D. is temporarily available for comparison purposes but will be removed
from the release.
!^:_1, which relied on D:, has been removed.
Henry Rich
On 9/3/2019 4:48 AM, Ben Gorte 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withdrawn.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
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