Thanks a lot to Hauke and to Raul!
Bo.
    Den lørdag den 22. juli 2023 kl. 13.15.19 CEST skrev Raul Miller 
<rauldmil...@gmail.com>:  
 
   JVERSION
Engine: j807/j64/windows
Release-d: commercial/2019-03-18T13:21:35
Library: 8.07.26
Qt IDE: 1.7.10s/5.9.8
Platform: Win 64
Installer: J807 install
InstallPath: c:/other/j64-807
Contact: www.jsoftware.com
  f=: 5&^ - 7&*
  f d.1 (0)
_5.39056
  (5&^ - 7&*)d.1(0)
_5.39056
  g=: f d.1
  g 0
_5.39056
  f=: 1 2 1&p.
  g 0
2

I hope this made sense,

--
Raul

On Sat, Jul 22, 2023 at 6:27 AM 'Bo Jacoby' via Programming
<programm...@jsoftware.com> wrote:
>
>
>
> Hello friends. A question.
>
>    f NB. some function
>
> 5&^ - 7&*
>
>    f d. 1 NB. why doesn't this differentiation work?
>
> f d.1
>
>    (5&^ - 7&*) d. 1 NB. this works!
>
> 1.6094379124341003&*@(5&^) - 7"0
>
>
>
>    JVERSION
>
> Engine: j807/j32/windows
>
> Release-d: commercial/2019-03-18T13:09:48
> Library: 8.07.26
> Qt IDE: 1.7.10/5.9.8
> Platform: Win 32
> Installer: J807 install
> InstallPath: c:/users/admin/j807
> Contact: www.jsoftware.com
>
>
> Thank you!
> Bo.
> ----------------------------------------------------------------------
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