Hi Jean-Philippe,
For a simple case like the one you sent, a rather not optimal solution can be
this:
\definemathmatrix[mymatrix]
[left={\left(\,},
right={\ \right)}]
\starttext
\startformula
\startmymatrix
\NC A \hskip .5em |\hskip-.5em \NC B \NR
\noalign{\hrule}
\NC C \hskip .5em |\hskip-.5em \NC D \NR
\stopmymatrix
\stopformula
\stoptext
However I think I have seen sometime ago a more elegant solution, but I could
not find it right now…
Best regards: Otared K.
> On 26 Nov 2020, at 10:19, Jean-Philippe Rey
> <jean-philippe....@centralesupelec.fr> wrote:
>
> Dear list,
>
> I would like to draw matrices with internal lines as can be done with LaTeX
> (cf pdf output) :
>
> ========================
> \documentclass{article}
> \begin{document}
> $M =\left( \begin{array}{c|c}
> A & B \\
> \hline
> C & D \\
> \end{array} \right)$
> \end{document}
> ========================
>
> I didn't find out how to use mathmatrix to achieve this. My best result to
> date is
>
> ========================
> \starttext
> $M = \left( \bTABLE[frame=off]
> \bTR
> \bTD[rightframe=on, bottomframe=on] $A$ \eTD
> \bTD[bottomframe=on] $B$ \eTD
> \eTR\bTR
> \bTD[rightframe=on] $C$ \eTD
> \bTD $D$ \eTD
> \eTR
> \eTABLE \right)$
> \stoptext
> ========================
>
> The code is rather ugly, and I get a spurious space at the bottom of the
> table.
>
> Any hints?
>
> Thank you,
>
> --
> Jean-Philippe Rey
> jean-philippe....@centralesupelec.fr
> 91192 Gif-sur-Yvette Cedex - France
> Empreinte PGP : 807A 5B2C 69E4 D4B5 783A 428A 1B5E E83E 261B BF51
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