Hi Hans, With the upgraded version of lmtx, the parentheses of the matrix are no longer adjusted to the content. Thank you. Fabrice
\definemathmatrix [pmatrix][matrix:parentheses][simplecommand=MATRIX] \starttext \math{\MATRIX{\MPcode{draw (0,0) -- (1cm,0);} ;\MPcode{draw (0,0) -- (1cm,0);} }} \stoptext
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