Hi Dalyoung,

Is this what you want:

\setupcolors[state=start]
\def\RedMath{\mframed[frame=on,
        framecolor=red,
        offset=2pt,
%       background=color,
%       backgroundcolor=lightred,
%       backgroundoffset=2pt
        ]}

\starttext
\startformula
\startmatrix[left={\left (\,},right={\,\right)}]
\NC\startmatrix[left=,right=,]
\NC a_{11} \NC a_{12} \NC \dots \NC a_{1n} \NR
\NC \vdots \NC \vdots \NC \vdots \NC \vdots \NR
\stopmatrix\NR
\NC\RedMath{\startmatrix[left=,right=,]
\NC      a_{i1} \NC a_{i2} \NC \cdots \NC a_{in} \NR
\stopmatrix}\NR
\NC\startmatrix[left=,right=,]
\NC \vdots \NC \vdots \NC \ddots \NC \vdots \NR
\NC      a_{m1} \NC a_{m2} \NC \cdots \NC a_{mn} \NR
\stopmatrix\NR
\stopmatrix
\stopformula 
\stoptext


Best regards: OK

On 25 juil. 2012, at 11:20, dalyoung wrote:

> Dear all,
> 
> I made a matrix as follows and I'd like to draw a red frame over the i-th row 
> in a matrix.
> 
> \startformula
> \startmatrix[left={\left (\,},right={\,\right)}]
> \NC a_{11} \NC a_{12} \NC \dots \NC a_{1n} \NR
> \NC \vdots \NC \vdots \NC \vdots \NC \vdots \NR
> \NC    a_{i1} \NC a_{i2} \NC \cdots \NC a_{in} \NR
> \NC \vdots \NC \vdots \NC \ddots \NC \vdots \NR
> \NC    a_{m1} \NC a_{m2} \NC \cdots \NC a_{mn} \NR
> \stopmatrix
> \stopformula 
> 
> But \frame or \inframe is not working inside matrix.
> Is there a way to do that?
> 
> Thank you.
> 
> Best regards,
> 
> Dalyoung
> ___________________________________________________________________________________
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> ___________________________________________________________________________________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the 
Wiki!

maillist : [email protected] / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
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