[Maxima-discuss] Something like texput, but for display2d?

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

Hi list,

I am trying to learn how to define new operators that have "nice"
representations in LaTeX and in display2d. Here is the example on
which I am working. I want

  Eq5(aa, bb, cc, dd, ee)

to be displayed as:

  aa = bb
     = cc
     = dd
     = ee

To configure its LaTeX output I simply adapted the example in the
section about "texput" here,

  (info "(maxima)Functions and Variables for TeX Output")

and I wrote this:

  texEq5(ex) :=
    block([a,b,c,d,e], [a,b,c,d,e] : args (ex),
      concat("\\begin{array}{rcl}",
             tex1(a), "&=&", tex1(b), "\\\\",
                      "&=&", tex1(c), "\\\\",
                      "&=&", tex1(d), "\\\\",
                      "&=&", tex1(e), "\\\\",
             "\\end{array}"));
  texput(Eq5, texEq5);
  tex(Eq5(aa, bb, cc, dd, ee));

Here's the output of the last line above, indented by hand:

  $$\begin{array}{rcl}
      {\it aa} &=& {\it bb} \\
               &=& {\it cc} \\
               &=& {\it dd} \\
               &=& {\it ee} \\
    \end{array}
  $$

This was easy to do, and works great. But I couldn't find much
documentation on how to configure how display2d displays "Eq5"
objects. I was only able to write this prototype for the first step:

  MatrixEq5(ex) :=
    block([a,b,c,d,e], [a,b,c,d,e] : args (ex),
      matrix([a,"=",b],["","=",c],["","=",d],["","=",e]))$

If I run this

  MatrixEq5(Eq5(aa, bb, cc, dd, ee));

the output is:

      [ aa  =  bb ]
      [           ]
      [     =  cc ]
      [           ]
      [     =  dd ]
      [           ]
      [     =  ee ]

So, questions:

  1) How can I get rid of the outer "[]"s?
  2) How can I get rid of the blank lines?
  3) How can I make Eq5 objects be displayed with MatrixEq5?
  4) Where can I find docs and examples about this?

Thanks in advance! =)
  Eduardo Ochs
  http://angg.twu.net/eev-maxima.html