In ConTeXt the ampersand is not an alignment character but has catcode 12 by default. Use the "ampersand replacement" option. \usemodule[tikz] \usetikzlibrary[matrix,decorations.pathreplacing, calc, positioning,fit] \starttext \starttikzpicture[>=stealth,thick,baseline, every right delimiter/.append style={name=rd}, ] \matrix [matrix of math nodes, left delimiter=(, right delimiter=), ampersand replacement=\& ](A){ a_{1,1} \& a_{1,2} \& \dots \& a_{1,j} \& \dots \& a_{1,n}\\ a_{2,1} \& a_{2,2} \& \dots \& a_{2,j} \& \dots \& a_{2,n}\\ \vdots \& \vdots \& \& \vdots \& \& \vdots\\ a_{i,1} \& a_{i,2} \& \dots \& a_{i,j} \& \dots \& a_{i,n}\\ \vdots \& \vdots \& \& \vdots \& \& \vdots\\ a_{n,1} \& a_{n,2} \& \dots \& a_{n,j} \& \dots \& a_{n,n}\\ }; \draw[<-] (rd)--++(0:6mm) node[right]{$i$-ième colonne}; \draw[<-] (A.south-|A-1-4.center) --++(-90:6mm) node[below]{$j$-ième colonne}; \stoptikzpicture \stoptext On 4/18/19 9:26 PM, Fabrice Couvreur wrote:
Hi, If I compile the following code, the result is not the one expected.
\usemodule[tikz] \usetikzlibrary[matrix,decorations.pathreplacing, calc, positioning,fit] \starttext
\starttikzpicture[>=stealth,thick,baseline, every right delimiter/.append style={name=rd}, ] \matrix [matrix of math nodes, left delimiter=(, right delimiter=), ](A){ a_{1,1} & a_{1,2} & \dots & a_{1,j} & \dots & a_{1,n}\\ a_{2,1} & a_{2,2} & \dots & a_{2,j} & \dots & a_{2,n}\\ \vdots & \vdots & & \vdots & & \vdots\\ a_{i,1} & a_{i,2} & \dots & a_{i,j} & \dots & a_{i,n}\\ \vdots & \vdots & & \vdots & & \vdots\\ a_{n,1} & a_{n,2} & \dots & a_{n,j} & \dots & a_{n,n}\\ };
\draw[<-] (rd)--++(0:6mm) node[right]{$i$-ième colonne}; \draw[<-] (A.south-|A-1-4.center) --++(-90:6mm) node[below]{$j$-ième colonne};
\stoptikzpicture \stoptext
Thank you Fabrice
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