Re: [Maxima-discuss] additional display flags for matrix, determinant, and box expressions

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

Hi Robert,

you're right! My first thoughts were buggy and I misinterpreted the
order of execution... here is a way to put a matrix without borders in
a cell of a normal matrix. Code:

  to_lisp();
    (setf (get '$barematrix 'dimension) 'dim-$barematrix)
    (defun dim-$barematrix (form result)
      (let (($display_matrix_brackets nil))
        (dim-$matrix form result)))
    (to-maxima)

  M1 : barematrix([a,b],[c,d]);
  M2 : matrix([M1,e],[f,g]);

and output:

  (%i4) M1 : barematrix([a,b],[c,d]);
                         a  b
  (%o4)
                         c  d
  (%i5) M2 : matrix([M1,e],[f,g]);
                    [  a  b     ]
                    [         e ]
  (%o5)             [  c  d     ]
                    [           ]
                    [   f     g ]
  (%i6)

Cheers =),
  Eduardo


On Sun, 12 Oct 2025 at 19:50, Robert Dodier <rob...@gm...> wrote:

> On Sun, Oct 12, 2025 at 3:16 PM Eduardo Ochs <edu...@gm...>
> wrote:
> > I don't see a way to put a matrix without brackets inside a matrix
> > with brackets.
>
> The display flags affect all expressions being displayed, so all
> matrices are displayed the same, all boxes displayed the same, all
> determinants the same too. So the only way (short of reorganizing the
> code) to get one expression displayed with one set of display flags
> and another displayed with a different set is to define different
> operators. This isn't a very satisfactory solution because any new
> operators won't have the same properties (algebraic and otherwise) as
> the existing built-in operators.
>