Re: [Maxima-discuss] One less bug in dim-%antideriv

[Robert D. <rob...@gm...>]

Hi Eduardo, thanks for your continued interest in Maxima, and thanks
for looking into the display stuff.

I've taken the liberty of forwarding your message to the mailing list.
I think every non-personal message should be sent to the mailing list,
on the theory that none of us own the code but we are all jointly
responsible in some way for it.

I have some other stuff that I am working on at the moment, although I
think I will have some time in December to look into various issues.
Can you please open a ticket on the SF bug tracker and attach your
notes and images so that we can keep track of the problem and the
state of its resolution.

If you have a proposed bugfix, please attach it as a diff to the bug report.

Thanks for your help, I appreciate it a lot.

All the best,

Robert

On Sat, Nov 29, 2025 at 4:28 PM Eduardo Ochs <edu...@gm...> wrote:
>
> Hi Robert,
>
> many months ago you sent this "defun dim-%antideriv" to the mailing
> list...
>
>   https://sourceforge.net/p/maxima/mailman/message/59178281/
>
> Look at the two screenshots below. The screenshot in
> "without-setq-width.png" uses your original code - and by defining
> this
>
>   mybox(o) := [box(o)];
>
> and then displaying "antideriv"s inside "mybox"es we can see clearly
> that there is something wrong with the widths... and the screenshot in
> "with-setq-width.png" uses your "dim-%antideriv" with a setq that I
> added - this one:
>
>   ;; Edrx:
>   (setq width (+ expr-w 1 (max upper-w lower-w)))
>
> Apparently that line fixes the bug in some cases... note that o1, o2
> and o4 look fine, but there is a one-off error in the display of o3.
>
> If you think that you won't have time to play with that in the next
> months AND you have suggestions on which of the less-obvious special
> variables could be the culprits, please say, and I will try to
> understand them when I have time. Besides that, many thanks - your
> "dim-%antideriv" is much more readable than the old-style dim-*
> functions in displa.lisp! - and sorry for taking months to debug it,
> etc... =)
>
>   Cheers!
>     Eduardo Ochs
>     https://anggtwu.net/eev-maxima.html
>
>
> P.S.: my version of the code is here:
> <https://anggtwu.net/MAXIMA/dim-antideriv.lisp.html>
>