My attempt to reproduce this failed on Windows 10 for
JVERSION
Engine: j902/j64avx/windows
Beta-i: commercial/2020-10-20T10:23:42
Library: 9.02.06
Platform: Win 64
Installer: J902 install
InstallPath: c:/pgm/j902
Contact: www.jsoftware.com
On Tue, Oct 27, 2020 at 4:32 AM 'Mike Day' via Programming <
[email protected]> wrote:
> Thanks for trying. I’ll clean-install j902 on my desktop, which I don’t
> often use for J, and see if I can reproduce the error. Maybe more later.
>
> Mike
>
> Sent from my iPad
>
> > On 26 Oct 2020, at 23:30, Henry Rich <[email protected]> wrote:
> >
> > I have tried to reproduce this twice: start the test, wait a while, then
> interrupt. Both times the system was uncorrupted.
> >
> > Can you give more info on when to interrupt to show the error?
> >
> > Henry Rich
> >
> >
> >> On 10/26/2020 11:24 AM, 'Michael Day' via Programming wrote:
> >> PROGRESS!?
> >>
> >> The problem reported under "[Jbeta] J902 exended problem" was NOT with
> i-beta in particular.
> >> It is a bit strange, and DOES apply to J901, and perhaps older
> versions too. Maybe
> >> something to do with memory allocation for very long extended
> representations.
> >>
> >> Something happens in the session which alters behaviour, whereby
> >> %4x is initially evaluated as 1r4, but after an interrupt, as shown
> below, it returns
> >> a value of 0.
> >>
> >> I expect an easier example would give rise to the same effect, but I'll
> stick with the
> >> latest manifestation, which is fairly concise.
> >>
> >> As I explained earlier, and partly mis-stated, I was exploring, in
> Maths-ish notation,
> >> sum{k=1, n} 1 / [(b^(c^k)) . (c^k)]
> >>
> >> One of my functions to explore this is
> >>
> >> cumSH =: 4 : 0
> >> n =. x
> >> 'b c' =. x: y
> >> +/\ % b (]* ^ ) c ^ >: i.n
> >> )
> >>
> >> Here's a clip from a session in J 901 :
> >> %4x NB. starts ok
> >> 1r4
> >> NB. cumSH soon gets slow - run too many cycles ...
> >> 20 cumSH 3 10 NB. interrupted using jbreak.bat...
> >> |break: cumSH
> >> | +/\%b (]*<.@^)c<.@^>:i.n
> >> %4x NB. different value now!
> >> 0
> >> datatype%4x NB. still extended, though wrong
> >> extended
> >>
> >> JVERSION
> >>
> >> Engine: j901/j64avx2/windows
> >>
> >> Release-f: commercial/2020-06-11T15:31:28
> >>
> >> Library: 9.01.23
> >>
> >> Qt IDE: 1.8.6/5.12.7(5.12.7)
> >>
> >> Platform: Win 64
> >>
> >> Installer: J901 install
> >>
> >> InstallPath: c:/d/j901
> >>
> >> Contact: www.jsoftware.com
> >>
> >>
> >> Thanks,
> >>
> >> Mike
> >>
> >>
> >>
> >>> On 26/10/2020 13:09, 'Michael Day' via Beta wrote:
> >>> OK - home again and "solved" this difficulty with extended. Well,
> chased it away -
> >>> I've no idea _why_ the error arose.
> >>>
> >>> So - in the absence of advice to the contrary, I ran the prescribed
> update method,
> >>> ie
> >>> load'pacman'
> >>> 'upgrade' jpkg 'jengine'
> >>>
> >>> This method had failed when I first ran it to update to beta-i , the
> failure manifesting
> >>> itself as an error reported when starting up J902 from its Windows
> shortcut. That was
> >>> why I had downloaded the zip file and overwritten my J902 folders with
> its contents.
> >>>
> >>> However, running the update in the approved manner worked today. The
> Windows
> >>> JQt shortcut fires up the session without crashing.
> >>>
> >>> Now, I find
> >>> 1%4x NB. was 0, yesterday !
> >>> 1r4
> >>> 1x%4x NB. " " "
> >>> 1r4
> >>>
> >>> as expected.
> >>>
> >>> Perhaps my attempt on 20/10/20 to overwrite the beta-h installation
> with files and folders
> >>> from the zip-file went wrong somewhere...
> >>>
> >>> Sorry to have raised this hare, but it was a real anomaly yesterday!
> >>>
> >>> Mike
> >>>
> >>
> >>
> >>
> >
> >
> > --
> > 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
>
--
Devon McCormick, CFA
Quantitative Consultant
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
