Hello, The third column of matrix is not centered vertically and horizontally. thank you, Fabrice \setupbodyfont[pagella,11pt] \definemathmatrix [pmatrix] [left={\left(\,},right={\,\right)}] \define[3]\coef{\math{#1_{#2, #3}}\autoinsertnextspace} \startsetups[table:initialize] \setupTABLE[offset=0.8ex,width=0.25\textwidth] \setupTABLE[row][first] [background=color,backgroundcolor=lightgray] \setupTABLE[start][align={middle,lohi}] \stopsetups \starttext {\bf Matrices particulières} \startlinecorrection[blank] \startmidaligned \switchtobodyfont[10pt] \bTABLE[setups=table:initialize] \bTR \bTD {\bf Matrice ligne} \\ Dimension \math{\left(1\times p\right)} \eTD \bTD {\bf Matrice colonne} \\ Dimension \math{\left(n\times 1\right)} \eTD \bTD {\bf Matrice carrée} \\ Dimension \math{\left(n\times n\right)} \eTD \bTD {\bf Matrice unité \math{\bi I_n}} \\ Dimension \math{\left(n\times n\right)} \eTD \eTR \bTR \bTD \startformula \startpmatrix \NC \coef{a}{1}{1} \NC \coef{a}{1}{2} \NC \dots \NC \coef{a}{1}{p} \stoppmatrix \stopformula \eTD \bTD \startformula \startpmatrix \NC \coef{a}{1}{1} \NR \NC \coef{a}{2}{1} \NR \NC \dots \NR \NC \coef{a}{n}{1} \stoppmatrix \stopformula \eTD \bTD \startformula \startpmatrix \NC \coef{a}{1}{1} \NC \coef{a}{1}{2} \NC \dots \NC \coef{a}{1}{n}\NR \NC \coef{a}{2}{1} \NC \coef{a}{2}{2} \NC \dots \NC \coef{a}{2}{n}\NR \NC \dots \NC \dots \NC \dots \NC \dots \NR \NC \coef{a}{n}{1} \NC \coef{a}{n}{2} \NC \dots \NC \coef{a}{n}{n} \stoppmatrix \stopformula \eTD \bTD \startformula \startpmatrix \NC 1 \NC 0 \NC \dots \NC 0 \NR \NC 0 \NC 1 \NC \dots \NC 0 \NR \NC \dots \NC \dots \NC \dots \NC \dots \NR \NC 0 \NC 0 \NC \dots \NC 1 \stoppmatrix \stopformula \eTD \eTR \eTABLE \stopmidaligned \stoplinecorrection \stoptext