[NTG-context] mathmatrix and internal lines

Hans Hagen j.hagen at xs4all.nl
Thu Nov 26 23:23:57 CET 2020

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 

   <command that picks up [#1]

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



		\NC A \VL  B \NR
		\NC C \VL  D \NR

		\NC A \VL[3,green]  B \NR
		\NC C \VL  D \NR


A bit more code needed but the next upload will have it. Of course you 
have to wikify it.


                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl

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