[NTG-context] Re: Question about matrices with vertical and horizontal lines (and now adding arrows between cells)

[Matthias Weber <matthiasweber64@gmail.com>]

Thanks!

Now, I would like to have arrows between cells. I have tried using overlays (see below), and I understand that an overlay is centered within the cell. How do I move the arrow so that it points from 6 to 7, for instance?
(Starting a little to the right and above the 6, ending below and to the left of the 7)

Matthias



\starttext
\startuseMPgraphic{DiagonalArrow}
  numeric w, h;
  w := OverlayWidth ;
  h := OverlayHeight ;
	draw lmt_arrow [ path =((.5*w,.5*w) -- (2*w,2*w)), ]
    withpen pencircle
    scaled (h/40)
    withcolor "darkgreen" ;
\stopuseMPgraphic

\defineoverlay
  [DiagonalArrow]
  [\useMPgraphic{DiagonalArrow}]
  
  
\setupTABLE[c][width=1cm,offset=overlay,align={middle,lohi}]
\setupTABLE[r][height=1cm]
\bTABLE
  \bTR \bTD 17 \eTD  \bTD  24 \eTD \bTD   1 \eTD \bTD  8\eTD \bTD  15 \eTD \eTR
   \bTR \bTD 23 \eTD  \bTD  5 \eTD \bTD  7 \eTD \bTD  14\eTD \bTD  16 \eTD \eTR
    \bTR \bTD 4 \eTD  \bTD  [background=DiagonalArrow] 6 \eTD \bTD  13 \eTD \bTD 20\eTD \bTD 22 \eTD \eTR
     \bTR \bTD 10 \eTD  \bTD  12 \eTD \bTD 19 \eTD \bTD 21\eTD \bTD 3 \eTD \eTR
   \bTR \bTD 11 \eTD  \bTD  18 \eTD \bTD 25 \eTD \bTD  2\eTD \bTD 9 \eTD \eTR
\eTABLE
\stopExample

\stoptext

> On Feb 27, 2025, at 6:09 AM, Mikael Sundqvist <mickep@gmail.com> wrote:
> 
> Hi,
> 
> On Thu, Feb 27, 2025 at 3:18 AM Matthias Weber
> <matthiasweber64@gmail.com> wrote:
>> 
>> Hi,
>> 
>> I’d like to typeset a matrix with vertical and horizontal lines like so:
>> 
>> starttext
>> 
>> \startformula
>> \startmatrix
>>   \HL
>>   \VL 16 \VL 3  \VL  2 \VL  12 \VL\NR
>>   \HL
>>   \VL 5 \VL 10 \VL 11 \VL 8  \VL\NR
>>   \HL
>>   \VL 9 \VL 6 \VL 7 \VL 12 \VL\NR
>>   \HL
>>   \VL 4 \VL 15 \VL 14 \VL 1 \VL\NR
>>   \HL
>> \stopmatrix
>> \stopformula
>> 
>> 
>> \starttable[|c|c|c|c|]
>> \HL
>> \VL $16$ \VL $3$ \VL $2$ \VL $12$ \VL \FR
>> \HL
>> \VL $5$ \VL $10$ \VL $11$ \VL $8$\VL \SR
>> \HL
>> \VL $9$ \VL $6$ \VL $7$\VL $12$ \VL\SR
>> \HL
>> \VL $4$ \VL $15$ \VL $14$ \VL  $1$ \VL\SR
>> \HL
>> \stoptable
>> 
>> \stoptext
>> 
>> In the matrix version, the horizontal lines extend too far to the left.
>> 
>> Ideally, I would like the cells to be squares, with the entries centered.
>> 
>> Thanks for any suggestions!
>> 
>> Matthias
> 
> You can try \VC instead of \VL for the first column. Also, square
> cells might be easiest(?) to get with natural tables.
> 
> \starttext
> 
> \startformula
>  x +
> \startmatrix
>   \HL
>   \VC 16 \VL  3 \VL  2 \VL 12 \VL\NR
>   \HL
>   \VC  5 \VL 10 \VL 11 \VL  8 \VL\NR
>   \HL
>   \VC  9 \VL  6 \VL  7 \VL 12 \VL\NR
>   \HL
>   \VC  4 \VL 15 \VL 14 \VL  1 \VL\NR
>   \HL
> \stopmatrix
>  + y
> \stopformula
> 
> \setupTABLE[c][width=1cm,offset=overlay,align={middle,lohi}]
> \setupTABLE[r][height=1cm]
> \bTABLE
>   \bTR \bTD 16 \eTD  \bTD  3 \eTD \bTD  2 \eTD \bTD 12 \eTD \eTR
>   \bTR \bTD  5 \eTD  \bTD 10 \eTD \bTD 11 \eTD \bTD  8 \eTD \eTR
>   \bTR \bTD  9 \eTD  \bTD  6 \eTD \bTD  7 \eTD \bTD 12 \eTD \eTR
>   \bTR \bTD  4 \eTD  \bTD 15 \eTD \bTD 14 \eTD \bTD  1 \eTD \eTR
> \eTABLE
> 
> \stoptext
> 
> /Mikael
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