Re: [NTG-context] mathmatrix and internal lines

27 Nov 2020

      Hi Hans,

Thanks for your insight!
Indeed I'll wikify what you explained, once I have tested it with the next upload. Would  \HL and \VL be also available in mkiv ?

Best regards: Otared
...
On 26 Nov 2020, at 23:23, Hans Hagen  wrote:
On 11/26/2020 8:43 PM, Otared Kavian wrote:
...
Hi Jean-Philippe,
A few weeks ago I saw briefly the discussion about Hans' message regarding \noalign and the the new definitions of \HR and \VR that you are sending. Indeed your solution works great !
Just for the case other people may have the same question about writing block matrix, I copy below the whole example which can be found later in the mail archive.
(For mkiv, I don't know how to do the same thing…).
The \noaligned permits a \protected definition. Otherwise one has to do something
\def\VR{\noalign\bgroup

that command then does the rule and ends the noalign. Also, that one cannot be \protected (a pitty in case one uses \expanded or so)
So ... a multistep approach. Plenty of that in mkiv.
...
%%% begin block-matrix.tex
% in LMTX defining \HR and \VR to create block matrices:
\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}
given the \HR definition that should be
\tolerant\protected\def\VR[#1]{\NC ...\NC}
...
\definemathmatrix[mymatrix]
  [left={\left(\,},
  right={\, \right)}]
\starttext	
\startformula
  \startmymatrix
      \NC A \VR  B \NR
      \HR
      \NC C \VR  D \NR
  \stopmymatrix
\stopformula
\stoptext
Anyway, a feature like this should be in sync with other table mechanisms, so
\definemathmatrix
 [mymatrix]
 [left={\left\lparent\thinspace},
  right={\thinspace\right\rparent}]
\starttext
\startformula
  \startmymatrix
      \NC A \VL  B \NR
      \HL
      \NC C \VL  D \NR
  \stopmymatrix
\stopformula
\startformula
  \startmymatrix
      \NC A \VL[3,green]  B \NR
      \HL[10,red]
      \NC C \VL  D \NR
  \stopmymatrix
\stopformula
\stoptext
A bit more code needed but the next upload will have it. Of course you have to wikify it.
Hans
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