# [texhax] Matrix problem

E. Krishnan ekmath at asianetindia.com
Wed Apr 12 18:03:05 CEST 2006

On Tue, 11 Apr 2006, Emrah Akyar wrote:

> Can someone tell me how to create the matrix like:
>
>   A B
> ( a b ) C
> ( c d ) D
>
> I want to type the column and row headers top of the each column and right
> of the each row outside the matrix brackets.

1. A quick trick would be to use the "amsmath" package and type

\begin{equation*}
\begin{matrix}
\begin{matrix}
A & B &
\end{matrix}\\
\begin{pmatrix}
a & b\\
c & d
\end{pmatrix}
\begin{matrix}
C\\
D
\end{matrix}
\end{matrix}
\end{equation*}

2. TeX has a macro "\bordermatrix" but this puts row signifiers on the
*left*

3. Herbert Voss has written a document named "mathmode.pdf" which shows
how  the "\bordermatrix" macro can be tweaked to meet different
requirements. It is available at

www.tug.org/tex-archive/info/math/voss/mathmode/Mathmode.pdf

--
Krishnan