Re: [NTG-context] mathmatrix and internal lines

26 Nov 2020

      Hi Otared,

Thank you very much.

I used your example to write the following macros. They are far from perfect but suit my needs.  A few days ago, Hans warned not to use \noalign in LMTX, so I used the trick he gave to the list even if I don't really understand it.

=== LMTX version ============
%D \macros{HR, VR}
%D \type{\HR} draws a horizontal rule between two rows of a matrix
%D \type{\VR} is used in place of \type{\NC} to draw a vertical rule between two columns of a matrix
%D each macro takes an optional parameter giving the rule dimensions
%D Example
%D  \type{\startmatrix \NC A \VR[depth 2mm] B \NR \HR[height 0.6pt] \NC C \VR D \NR \stopmatrix}

\pushoverloadmode
\noaligned\tolerant\protected\def\HR[#1]{\noalign{\hrule #1}}
\popoverloadmode

\def\VR{\dosingleempty\doVR}
\def\doVR[#1]{\NC \hskip-0.5em \vrule #1 \hskip-0.5em \NC}
===========================

=== MkIV version ============
%D \macros{HR, VR}
%D \type{\HR} draws a horizontal rule between two rows of a matrix
%D \type{\VR} is used in place of \type{\NC} to draw a vertical rule between two columns of a matrix
%D it takes an optional parameter giving the rule dimensions
%D Example
%D  \type{\startmatrix \NC A \VR[depth 2mm] B \NR \HR \NC C \VR D \NR \stopmatrix}

\def\HR{\noalign{\hrule}}

\def\VR{\dosingleempty\doVR}
\def\doVR[#1]{\NC \hskip-0.5em \vrule #1 \hskip-0.5em \NC}
===========================

For the MkIV version I haven't been able to add an optional parameter to \HR the code

\def\HR{\dosingleempty\doHR}
\def\doHR[#1]{\noalign{\hrule #1}}

complains about "Misplaced \noalign"

Best regards,
...
Le 26 nov. 2020 à 13:40, Otared Kavian  a écrit :
Hi Jean-Philippe,
The following is better than the one I sent earlier:
\definemathmatrix[mymatrix]
  [left={\left(\,},
  right={\ \right)}]
\starttext
\startformula
  \startmymatrix
      \NC A \NC\hskip-.5em \vrule  \NC\hskip-.5em B \NR
      \noalign{\hrule}
      \NC C \NC \hskip-.5em\vrule \NC \hskip-.5em D \NR
  \stopmymatrix
\stopformula
\stoptext
Best regards: Otared K.
...
On 26 Nov 2020, at 10:19, Jean-Philippe Rey  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.rey@centralesupelec.fr mailto:jean-philippe.rey@centralesupelec.fr
91192 Gif-sur-Yvette Cedex - France
Empreinte PGP : 807A 5B2C 69E4 D4B5 783A 428A 1B5E E83E 261B BF51