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

27 Feb 2025

      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  wrote:
Hi,
On Thu, Feb 27, 2025 at 3:18 AM Matthias Weber
 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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