%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  1. Auflage
%% 
%%  Beispiel 06-03-27 auf Seite 239.
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{166.324pt}
\setlength\parskip{10pt}
\AtBeginDocument{\setbox0\hbox{$ $}}
\StartShownPreambleCommands
\usepackage{blkarray}
\StopShownPreambleCommands
\begin{document}
\begin{blockarray}{>{\scriptsize}ccccl}
\begin{block}{*{5}{>{\scriptsize}c}}
1 & 2 & 3 & 4 & Spalten\\
\end{block}
\begin{block}{\Left{Demo} \{ >{\scriptsize}cccc
     \Right\}{3$\times$3 Matrix} l}
2 & 22 & 32 & 42\\ 3 & 23 & 33  & 43\\
4 & 24 & 34 & 44\\
\end{block}
\makebox[0pt][l]{\scriptsize Zeilen}
\end{blockarray}
\end{document}
