Hello, This macro that is not mine worked very well. I just tested the following file and there is a problem. Thank you Fabrice
\definemathmatrix [pmatrix] [left={\left(\,},right={\,\right)}] \starttext \math{M^3=\startpmatrix \NC 2 \NC 3 \NC 6 \NC 4 \NC 2 \NC 7 \NC 3 \NC 1 \NR \NC 3 \NC 0 \NC 1 \NC 1 \NC 2 \NC 3 \NC 6 \NC 4 \NR \NC 6 \NC 1 \NC 4 \NC 4 \NC 4 \NC 9 \NC 10 \NC 6 \NR \NC 4 \NC 1 \NC 4 \NC 4 \NC 5 \NC 8 \NC 8 \NC 3 \NR \NC 2 \NC 2 \NC 4 \NC 5 \NC 2 \NC 7 \NC 3 \NC 1 \NR \NC 7 \NC 3 \NC 9 \NC 8 \NC 7 \NC 8 \NC 10 \NC 3 \NR \NC 3 \NC 6 \NC 10 \NC 8 \NC 3 \NC 10 \NC 4 \NC 1 \NR \NC 1 \NC 4 \NC 6 \NC 3 \NC 1 \NC 3 \NC 1 \NC 0 \NR \stoppmatrix} \stoptext
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