On Wed, 5 Sep 2007, Peter Schorsch wrote:

> Hi,
>
> I could not figure out how to add a hairline between two rows of a matrix.
>
> Following example is compiling but only results in a bigger vertical space.
> Infos/Hints are welcome...
>
>
> \startformula \startmatrix
>    \NC {a_1 } \NC {a_2 } \NC {a_3 }  \NC  \ldots      \NC {a_X }  \NR
>    \NC {b_1 } \NC 0      \NC 0       \NC 0            \NC 0       \NR
>    \NC 0      \NC {b_2 } \NC 0       \NC 0            \NC 0       \NR
>    \NC 0      \NC 0      \NC  \ddots \NC 0            \NC 0       \NR
>   \NC[n=5] {\text{\hairline}} \NR
>    \NC 0      \NC 0      \NC 0       \NC {b_{X - 1} } \NC 0       \NR
> \stopmatrix \stopformula
>

Does this help?

http://archive.contextgarden.net/thread/20070213.162016.1c7e6959.en.html

Aditya