Re: [Maxima-discuss] new flags for matrix elements padding for pretty printer display

[Eduardo O. <edu...@gm...>]

Fantastic, thanks! =)

Now this is mentioned and used in Lisptree, as one of the ways to
display lisptrees nicely. Here's what the comments say:

;; The simplest way to display a lisptree is with a `matrix' of
;; strings - the o1 above. We can use a `barematrix' to get rid of the
;; outer brackets - the o2 above - but `barematrix'es have interline
;; spacings/paddings, that are ugly; if we replace `barematrix' by
;; `barematrixnp' we get a `barematrix' with no padding, that looks
;; great... but that only appears different from a normal `matrix' in
;; recent versions of Maxima.
;;
;; The objects o4 and o5 above use `verbatimbox' and `verbatimmatrix',
;; that work well on old versions of Maxima, so in most cases I prefer
;; to display lisptrees by using a `verbatimmatrix' instead of a
;; `matrix' or a `barematrixnp'. See:
;;
;;   https://anggtwu.net/maxima-edrxbox.html

I am attaching a screenshot in which that looks a bit better - because
it has an example and colors.

  Cheers! =)
    Eduardo


On Thu, 11 Dec 2025 at 15:15, Robert Dodier <rob...@gm...> wrote:

> I've pushed some commits to src/displa.lisp to implement two more
> display flags, display_matrix_padding_vertical and
> display_matrix_padding_horizontal.
>
> By default, matrix elements are displayed with space between rows and
> space between columns. These new flags enable (default) or disable
> that spacing.
>
> I've attached some simple examples as an image (I couldn't figure out
> a way to disable Gmail composer's interline spacing). This image shows
> what I see in a terminal on an Ubuntu system.
>
> For more extensive examples, you can try, after building the current
> version from GIt:
>
> batch ("tests/test_matrix_display.mac");
>
> which shows a lot of examples of the recently-created display flags
> for boxes and matrices.
>
> I think this will be useful. Any comments are welcome.
>
> Robert
>