Hi Xan,
It's not exactly what you want, but maybe it'll give you some other ideas:
\definemathmatrix[pmatrix][
left={\left(\,},
right={\,\right)},
]
\definenumber[pmatrix]
\resetnumber[pmatrix]
\define\nextmatrix{
\incrementnumber[pmatrix]
\getnumber[pmatrix].
}
\define[2]\pmatrices{
\blank[big]
\framed[frame=off]{
\startmixedcolumns[n=#1]
#2
\stopmixedcolumns
}
}
\starttext
Digueu quines de les matrius següents són regulars. Quan ho siguin,
trobeu la inversa
\pmatrices{4}{
\nextmatrix
\startpmatrix
\NC 2 \NC 3 \NR
\NC 6 \NC 7 \NR
\stoppmatrix
\column
\nextmatrix
\startpmatrix
\NC 3 \NC 2 \NC 1 \NR
\NC 4 \NC 5 \NC 3 \NR
\NC 5 \NC 0 \NC -2 \NR
\stoppmatrix
\column
\nextmatrix
\startpmatrix
\NC 5 \NC 4 \NC 2 \NR
\NC 2 \NC 2 \NC 3 \NR
\NC 7 \NC 6 \NC 5 \NR
\stoppmatrix
\column
\nextmatrix
\startpmatrix
\NC a \NC 0 \NC 0 \NC 0 \NR
\NC 0 \NC b \NC 0 \NC 0 \NR
\NC 0 \NC 0 \NC c \NC 0 \NR
\NC 0 \NC 0 \NC 0 \NC d \NR
\stoppmatrix
}
\stoptext
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