Hi Wolfgang,

Thank you for your solution.The space came from copy-paste because if I do this, it does not work :

\definemathmatrix [pmatrix][matrix:parentheses][simplecommand=MATRIX]

\starttext

\math{\MATRIX{\MPcode{draw (0,0) -- (1cm,0);} ;\MPcode{draw (0,0) -- (1cm,0);}}}

\stoptext

Fabrice

Le dim. 14 oct. 2018 à 11:08, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> a écrit :

Fabrice Couvreur schrieb am 14.10.18 um 10:46:

Hi,
I tried to use Metafun and \definemathmatrix [pmatrix] [matrix: parentheses] [simplecommand = MATRIX] to create two matrices, but that does not work.

1. You have a space in [matrix: parentheses]

2. When you have only simple graphics like in your example you can use framed.

\starttext

\startformula
  A\,
  \startmathmatrix[left=\left(,right=\right)]
  \NC \framed[width=1em,height=1em,frame=off,bottomframe=on]{} \NC \framed[width=1em,height=1em,frame=off,bottomframe=on,leftframe=on]{} \NR
  \NC \framed[width=1em,height=1em,frame=off,rightframe=on]{} \NC \framed[width=1em,height=1em]{} \NR
  \stopmathmatrix
\stopformula

\stoptext

Wolfgang